#Topic Surface
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#Alias Surface_Reference ##
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#Class SkSurface
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#Code
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#Populate
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##
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SkSurface is responsible for managing the pixels that a canvas draws into. The pixels can be
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allocated either in CPU memory, if a raster surface; or on the GPU, for a GrRenderTarget surface.
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SkSurface takes care of allocating a SkCanvas that will draw into the surface. Call
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surface->getCanvas() to use that canvas. The caller should not delete the returned canvas;
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it is owned by surface.
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SkSurface always has non-zero dimensions. If there is a request for a new surface, and either
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of the requested dimensions are zero, then nullptr will be returned.
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# ------------------------------------------------------------------------------
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#Method static sk_sp<SkSurface> MakeRasterDirect(const SkImageInfo& imageInfo, void* pixels,
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size_t rowBytes,
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const SkSurfaceProps* surfaceProps = nullptr)
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#In Constructors
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#Line # creates Surface from SkImageInfo and Pixel_Storage ##
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#Populate
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#Example
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void draw(SkCanvas* ) {
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SkImageInfo info = SkImageInfo::MakeN32Premul(3, 3);
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const size_t size = info.computeMinByteSize();
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SkAutoTMalloc<SkPMColor> storage(size);
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SkPMColor* pixels = storage.get();
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sk_sp<SkSurface> surface(SkSurface::MakeRasterDirect(info, pixels, info.minRowBytes()));
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SkCanvas* canvas = surface->getCanvas();
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canvas->clear(SK_ColorWHITE);
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SkPMColor pmWhite = pixels[0];
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SkPaint paint;
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canvas->drawPoint(1, 1, paint);
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canvas->flush(); // ensure that point was drawn
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for (int y = 0; y < info.height(); ++y) {
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for (int x = 0; x < info.width(); ++x) {
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SkDebugf("%c", *pixels++ == pmWhite ? '-' : 'x');
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}
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SkDebugf("\n");
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}
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}
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#StdOut
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---
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-x-
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---
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##
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##
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#SeeAlso MakeRasterDirectReleaseProc MakeRaster MakeRasterN32Premul SkCanvas::MakeRasterDirect
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#Method ##
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# ------------------------------------------------------------------------------
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#Method static sk_sp<SkSurface> MakeRasterDirectReleaseProc(const SkImageInfo& imageInfo, void* pixels,
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size_t rowBytes,
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void (*releaseProc)(void* pixels, void* context),
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void* context, const SkSurfaceProps* surfaceProps = nullptr)
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#In Constructors
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#Line # creates Surface from SkImageInfo and Pixel_Storage ##
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#Populate
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#Example
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#Function
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static void release_direct_surface_storage(void* pixels, void* context) {
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if (pixels == context) {
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SkDebugf("expected release context\n");
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}
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sk_free(pixels);
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}
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##
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void draw(SkCanvas* ) {
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SkImageInfo info = SkImageInfo::MakeN32Premul(3, 3);
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const size_t rowBytes = info.minRowBytes();
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void* pixels = sk_malloc_throw(info.computeByteSize(rowBytes));
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sk_sp<SkSurface> surface(SkSurface::MakeRasterDirectReleaseProc(info, pixels, rowBytes,
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release_direct_surface_storage, pixels));
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SkCanvas* canvas = surface->getCanvas();
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canvas->clear(SK_ColorWHITE);
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SkPMColor* colorPtr = (SkPMColor*) pixels;
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SkPMColor pmWhite = colorPtr[0];
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SkPaint paint;
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canvas->drawPoint(1, 1, paint);
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canvas->flush(); // ensure that point was drawn
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for (int y = 0; y < info.height(); ++y) {
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for (int x = 0; x < info.width(); ++x) {
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SkDebugf("%c", *colorPtr++ == pmWhite ? '-' : 'x');
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}
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SkDebugf("\n");
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}
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}
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#StdOut
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---
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-x-
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---
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expected release context
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##
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##
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#SeeAlso MakeRasterDirect MakeRasterN32Premul MakeRaster
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#Method ##
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# ------------------------------------------------------------------------------
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#Method static sk_sp<SkSurface> MakeRaster(const SkImageInfo& imageInfo, size_t rowBytes,
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const SkSurfaceProps* surfaceProps)
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#In Constructors
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#Line # creates Surface from SkImageInfo ##
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#Populate
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#Example
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void draw(SkCanvas* ) {
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SkImageInfo info = SkImageInfo::MakeN32Premul(3, 3);
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const size_t rowBytes = 64;
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sk_sp<SkSurface> surface(SkSurface::MakeRaster(info, rowBytes, nullptr));
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SkCanvas* canvas = surface->getCanvas();
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canvas->clear(SK_ColorWHITE);
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SkPixmap pixmap;
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if (surface->peekPixels(&pixmap)) {
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const uint32_t* colorPtr = pixmap.addr32();
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SkPMColor pmWhite = colorPtr[0];
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SkPaint paint;
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canvas->drawPoint(1, 1, paint);
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canvas->flush(); // ensure that point was drawn
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for (int y = 0; y < info.height(); ++y) {
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for (int x = 0; x < info.width(); ++x) {
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SkDebugf("%c", colorPtr[x] == pmWhite ? '-' : 'x');
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}
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colorPtr += rowBytes / sizeof(colorPtr[0]);
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SkDebugf("\n");
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}
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}
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}
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#StdOut
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---
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-x-
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---
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##
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##
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#SeeAlso MakeRasterDirect MakeRasterN32Premul MakeRasterDirectReleaseProc
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#Method ##
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# ------------------------------------------------------------------------------
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#Method static sk_sp<SkSurface> MakeRaster(const SkImageInfo& imageInfo,
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const SkSurfaceProps* props = nullptr)
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#Populate
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#Example
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void draw(SkCanvas* ) {
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SkImageInfo info = SkImageInfo::MakeN32Premul(3, 3);
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sk_sp<SkSurface> surface(SkSurface::MakeRaster(info));
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SkCanvas* canvas = surface->getCanvas();
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canvas->clear(SK_ColorWHITE);
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SkPixmap pixmap;
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if (surface->peekPixels(&pixmap)) {
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const uint32_t* colorPtr = pixmap.addr32();
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SkPMColor pmWhite = colorPtr[0];
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SkPaint paint;
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canvas->drawPoint(1, 1, paint);
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canvas->flush(); // ensure that point was drawn
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for (int y = 0; y < info.height(); ++y) {
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for (int x = 0; x < info.width(); ++x) {
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SkDebugf("%c", colorPtr[x] == pmWhite ? '-' : 'x');
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}
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colorPtr += info.width();
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SkDebugf("\n");
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}
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}
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}
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##
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#SeeAlso MakeRasterDirect MakeRasterN32Premul MakeRasterDirectReleaseProc
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#Method ##
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# ------------------------------------------------------------------------------
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#Method static sk_sp<SkSurface> MakeRasterN32Premul(int width, int height,
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const SkSurfaceProps* surfaceProps = nullptr)
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#In Constructors
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#Line # creates Surface from width, height matching output ##
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#Populate
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#Example
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void draw(SkCanvas* ) {
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sk_sp<SkSurface> surface(SkSurface::MakeRasterN32Premul(3, 3));
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SkCanvas* canvas = surface->getCanvas();
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canvas->clear(SK_ColorWHITE);
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SkPixmap pixmap;
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if (surface->peekPixels(&pixmap)) {
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const uint32_t* colorPtr = pixmap.addr32();
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SkPMColor pmWhite = colorPtr[0];
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SkPaint paint;
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canvas->drawPoint(1, 1, paint);
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canvas->flush(); // ensure that point was drawn
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for (int y = 0; y < surface->height(); ++y) {
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for (int x = 0; x < surface->width(); ++x) {
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SkDebugf("%c", colorPtr[x] == pmWhite ? '-' : 'x');
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}
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colorPtr += surface->width();
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SkDebugf("\n");
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}
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}
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}
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#StdOut
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---
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-x-
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---
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##
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##
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#SeeAlso MakeRasterDirect MakeRasterN32Premul MakeRasterDirectReleaseProc
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#Method ##
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# ------------------------------------------------------------------------------
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#Method static sk_sp<SkSurface> MakeFromBackendTexture(GrContext* context,
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const GrBackendTexture& backendTexture,
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GrSurfaceOrigin origin, int sampleCnt,
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SkColorType colorType,
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sk_sp<SkColorSpace> colorSpace,
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const SkSurfaceProps* surfaceProps)
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#In Constructors
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#Line # creates Surface from GPU texture ##
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#Populate
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#Example
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#Platform gpu cpu
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#Image 3
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SkPaint paint;
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paint.setTextSize(32);
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GrContext* context = canvas->getGrContext();
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if (!context) {
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canvas->drawString("GPU only!", 20, 40, paint);
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return;
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}
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sk_sp<SkSurface> gpuSurface = SkSurface::MakeFromBackendTexture(context,
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backEndTexture, kTopLeft_GrSurfaceOrigin, 0,
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kRGBA_8888_SkColorType, nullptr, nullptr);
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auto surfaceCanvas = gpuSurface->getCanvas();
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surfaceCanvas->drawString("GPU rocks!", 20, 40, paint);
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sk_sp<SkImage> image(gpuSurface->makeImageSnapshot());
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canvas->drawImage(image, 0, 0);
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##
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#SeeAlso GrBackendTexture MakeFromBackendRenderTarget MakeRenderTarget
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#Method ##
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# ------------------------------------------------------------------------------
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#Method static sk_sp<SkSurface> MakeFromBackendRenderTarget(GrContext* context,
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const GrBackendRenderTarget& backendRenderTarget,
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GrSurfaceOrigin origin,
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SkColorType colorType,
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sk_sp<SkColorSpace> colorSpace,
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const SkSurfaceProps* surfaceProps)
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#In Constructors
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#Line # creates Surface from GPU render target ##
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#Populate
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#Example
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#ToDo remove !fiddle below once backEndTextureRenderTarget is available ##
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#Platform !fiddle gpu
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SkPaint paint;
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paint.setTextSize(32);
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GrContext* context = canvas->getGrContext();
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if (!context) {
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canvas->drawString("GPU only!", 20, 40, paint);
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return;
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}
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sk_sp<SkSurface> gpuSurface = SkSurface::MakeFromBackendRenderTarget(context,
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backEndRenderTarget, kTopLeft_GrSurfaceOrigin, kRGBA_8888_SkColorType,
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nullptr, nullptr);
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auto surfaceCanvas = gpuSurface->getCanvas();
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surfaceCanvas->drawString("GPU rocks!", 20, 40, paint);
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sk_sp<SkImage> image(gpuSurface->makeImageSnapshot());
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canvas->drawImage(image, 0, 0);
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##
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#SeeAlso MakeFromBackendTexture MakeRenderTarget
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#Method ##
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# ------------------------------------------------------------------------------
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#Method static sk_sp<SkSurface> MakeFromBackendTextureAsRenderTarget(GrContext* context,
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const GrBackendTexture& backendTexture,
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GrSurfaceOrigin origin,
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int sampleCnt,
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SkColorType colorType,
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sk_sp<SkColorSpace> colorSpace,
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const SkSurfaceProps* surfaceProps)
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#In Constructors
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#Line # creates Surface from GPU back-end render target ##
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#Populate
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#Example
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#ToDo example is bogus; gpuSurface should not make image ##
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#Platform gpu
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#Image 3
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SkPaint paint;
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paint.setTextSize(32);
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GrContext* context = canvas->getGrContext();
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if (!context) {
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canvas->drawString("GPU only!", 20, 40, paint);
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return;
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}
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sk_sp<SkSurface> gpuSurface = SkSurface::MakeFromBackendTextureAsRenderTarget(
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context, backEndTexture, kTopLeft_GrSurfaceOrigin, 0,
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kRGBA_8888_SkColorType, nullptr, nullptr);
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auto surfaceCanvas = gpuSurface->getCanvas();
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surfaceCanvas->drawString("GPU rocks!", 20, 40, paint);
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sk_sp<SkImage> image(gpuSurface->makeImageSnapshot());
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canvas->drawImage(image, 0, 0);
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##
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#SeeAlso MakeFromBackendRenderTarget MakeRenderTarget
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#Method ##
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# ------------------------------------------------------------------------------
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#Method static sk_sp<SkSurface> MakeRenderTarget(GrContext* context, SkBudgeted budgeted,
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const SkImageInfo& imageInfo,
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int sampleCount, GrSurfaceOrigin surfaceOrigin,
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const SkSurfaceProps* surfaceProps,
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bool shouldCreateWithMips = false)
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#In Constructors
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#Line # creates Surface pointing to new GPU memory buffer ##
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#Populate
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#Example
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#Platform gpu
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#Height 64
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SkPaint paint;
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paint.setTextSize(32);
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GrContext* context = canvas->getGrContext();
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if (!context) {
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canvas->drawString("GPU only!", 20, 40, paint);
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return;
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}
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SkImageInfo info = SkImageInfo::MakeN32(256, 64, kOpaque_SkAlphaType);
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for (auto surfaceOrigin : { kTopLeft_GrSurfaceOrigin, kBottomLeft_GrSurfaceOrigin } ) {
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auto gpuSurface(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, info, 0,
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surfaceOrigin, nullptr));
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auto surfaceCanvas = gpuSurface->getCanvas();
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surfaceCanvas->clear(SK_ColorWHITE);
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surfaceCanvas->drawString("GPU rocks!", 20, 40, paint);
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sk_sp<SkImage> image(gpuSurface->makeImageSnapshot());
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canvas->drawImage(image, 0, 0);
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canvas->translate(0, 128);
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}
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##
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#SeeAlso MakeFromBackendRenderTarget MakeFromBackendTextureAsRenderTarget
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#Method ##
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# ------------------------------------------------------------------------------
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#Method static sk_sp<SkSurface> MakeRenderTarget(GrContext* context, SkBudgeted budgeted,
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const SkImageInfo& imageInfo, int sampleCount,
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const SkSurfaceProps* props)
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#Populate
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#Example
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#Platform cpu gpu
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#Description
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LCD text takes advantage of raster striping to improve resolution. Only one of
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the four combinations is correct, depending on whether monitor LCD striping is
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horizontal or vertical, and whether the order of the stripes is red blue green
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or red green blue.
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##
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void draw(SkCanvas* canvas) {
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auto test_draw = [](SkCanvas* surfaceCanvas) -> void {
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setLCDRenderText(true);
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paint.setColor(0xFFBBBBBB);
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surfaceCanvas->drawRect(SkRect::MakeWH(128, 64), paint);
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paint.setColor(SK_ColorWHITE);
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paint.setTextSize(32);
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surfaceCanvas->drawString("Pest", 0, 25, paint);
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};
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GrContext* context = canvas->getGrContext();
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SkImageInfo info = SkImageInfo::MakeN32(128, 64, kOpaque_SkAlphaType);
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int y = 0;
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for (auto geometry : { kRGB_H_SkPixelGeometry, kBGR_H_SkPixelGeometry,
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kRGB_V_SkPixelGeometry, kBGR_V_SkPixelGeometry } ) {
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SkSurfaceProps props(0, geometry);
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sk_sp<SkSurface> surface = context ? SkSurface::MakeRenderTarget(
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context, SkBudgeted::kNo, info, 0, &props) : SkSurface::MakeRaster(info, &props);
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test_draw(surface->getCanvas());
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surface->draw(canvas, 0, y, nullptr);
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sk_sp<SkImage> image(surface->makeImageSnapshot());
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SkAutoCanvasRestore acr(canvas, true);
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canvas->scale(8, 8);
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canvas->drawImage(image, 12, y / 8);
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y += 64;
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}
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}
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##
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#SeeAlso MakeFromBackendRenderTarget MakeFromBackendTextureAsRenderTarget
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#Method ##
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# ------------------------------------------------------------------------------
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#Method static sk_sp<SkSurface> MakeRenderTarget(GrContext* context, SkBudgeted budgeted,
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const SkImageInfo& imageInfo)
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#Populate
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#Example
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#Platform gpu
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SkPaint paint;
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paint.setTextSize(32);
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GrContext* context = canvas->getGrContext();
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if (!context) {
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canvas->drawString("GPU only!", 20, 40, paint);
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return;
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}
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SkImageInfo info = SkImageInfo::MakeN32(256, 64, kOpaque_SkAlphaType);
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auto gpuSurface(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, info));
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auto surfaceCanvas = gpuSurface->getCanvas();
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surfaceCanvas->clear(SK_ColorWHITE);
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surfaceCanvas->drawString("GPU rocks!", 20, 40, paint);
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sk_sp<SkImage> image(gpuSurface->makeImageSnapshot());
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canvas->drawImage(image, 0, 0);
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##
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#SeeAlso MakeFromBackendRenderTarget MakeFromBackendTextureAsRenderTarget
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#Method ##
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|
# ------------------------------------------------------------------------------
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#Method static sk_sp<SkSurface> MakeRenderTarget(GrContext* context,
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const SkSurfaceCharacterization& characterization,
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SkBudgeted budgeted)
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#Populate
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#NoExample
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##
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#SeeAlso MakeFromBackendRenderTarget MakeFromBackendTextureAsRenderTarget
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#Method ##
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# ------------------------------------------------------------------------------
|
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#Method static sk_sp<SkSurface> MakeNull(int width, int height)
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#In Constructors
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#Line # creates Surface without backing pixels ##
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#Populate
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#Example
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SkDebugf("SkSurface::MakeNull(0, 0) %c= nullptr\n", SkSurface::MakeNull(0, 0) == nullptr ?
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'=' : '!');
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const int w = 37;
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const int h = 1000;
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auto surf = SkSurface::MakeNull(w, h);
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auto nullCanvas = surf->getCanvas();
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nullCanvas->drawPaint(SkPaint()); // does not crash, nothing draws
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SkDebugf("surf->makeImageSnapshot() %c= nullptr\n", surf->makeImageSnapshot() == nullptr ?
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'=' : '!');
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#StdOut
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SkSurface::MakeNull(0, 0) == nullptr
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surf->makeImageSnapshot() == nullptr
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##
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##
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#SeeAlso MakeRaster MakeRenderTarget
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#Method ##
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# ------------------------------------------------------------------------------
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#Subtopic Property
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#Line # member values ##
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##
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#Method int width() const
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|
#In Property
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#Line # returns pixel column count ##
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#Populate
|
|
#Example
|
const int width = 37;
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const int height = 1000;
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auto surf = SkSurface::MakeNull(width, height);
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auto nullCanvas = surf->getCanvas();
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SkDebugf("surface width=%d canvas width=%d\n", surf->width(),
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nullCanvas->getBaseLayerSize().fWidth);
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#StdOut
|
surface width=37 canvas width=37
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##
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##
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|
#SeeAlso height()
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|
#Method ##
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|
# ------------------------------------------------------------------------------
|
|
#Method int height() const
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#In Property
|
#Line # returns pixel row count ##
|
#Populate
|
|
#Example
|
const int width = 37;
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const int height = 1000;
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auto surf = SkSurface::MakeNull(width, height);
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auto nullCanvas = surf->getCanvas();
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SkDebugf("surface height=%d canvas height=%d\n", surf->height(),
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nullCanvas->getBaseLayerSize().fHeight);
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#StdOut
|
surface height=1000 canvas height=1000
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##
|
##
|
|
#SeeAlso width()
|
|
#Method ##
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|
# ------------------------------------------------------------------------------
|
|
#Method uint32_t generationID()
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#In Property
|
#Line # returns unique ID ##
|
#Populate
|
|
#Example
|
auto surface = SkSurface::MakeRasterN32Premul(1, 1);
|
for (int i = 0; i < 3; ++i) {
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SkDebugf("surface generationID: %d\n", surface->generationID());
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if (0 == i) {
|
surface->getCanvas()->drawColor(SK_ColorBLACK);
|
} else {
|
surface->notifyContentWillChange(SkSurface::kDiscard_ContentChangeMode);
|
}
|
}
|
#StdOut
|
surface generationID: 1
|
surface generationID: 2
|
surface generationID: 3
|
##
|
##
|
|
#SeeAlso notifyContentWillChange ContentChangeMode getCanvas
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Enum ContentChangeMode
|
#Line # parameter options for notifyContentWillChange ##
|
#Code
|
enum ContentChangeMode {
|
kDiscard_ContentChangeMode,
|
kRetain_ContentChangeMode,
|
};
|
##
|
|
ContentChangeMode members are parameters to notifyContentWillChange.
|
|
#Const kDiscard_ContentChangeMode
|
#Line # discards surface on change ##
|
Pass to notifyContentWillChange to discard surface contents when
|
the surface is cleared or overwritten.
|
##
|
#Const kRetain_ContentChangeMode
|
#Line # preserves surface on change ##
|
Pass to notifyContentWillChange when to preserve surface contents.
|
If a snapshot has been generated, this copies the Surface contents.
|
##
|
|
#SeeAlso notifyContentWillChange generationID
|
|
#Enum ##
|
|
# ------------------------------------------------------------------------------
|
|
#ToDo not crazy about misc catagory -- hopefully will become clear with time
|
##
|
|
#Subtopic Miscellaneous
|
#Line # other functions ##
|
##
|
|
#Method void notifyContentWillChange(ContentChangeMode mode)
|
#In Miscellaneous
|
#Line # notifies that contents will be changed outside of Skia ##
|
#Populate
|
|
#Example
|
auto surface = SkSurface::MakeRasterN32Premul(1, 1);
|
for (int i = 0; i < 3; ++i) {
|
SkDebugf("surface generationID: %d\n", surface->generationID());
|
if (0 == i) {
|
surface->getCanvas()->drawColor(SK_ColorBLACK);
|
} else {
|
surface->notifyContentWillChange(SkSurface::kDiscard_ContentChangeMode);
|
}
|
}
|
##
|
|
#SeeAlso ContentChangeMode generationID
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Enum BackendHandleAccess
|
#Line # options to read and write back-end object ##
|
#Code
|
enum BackendHandleAccess {
|
kFlushRead_BackendHandleAccess,
|
kFlushWrite_BackendHandleAccess,
|
kDiscardWrite_BackendHandleAccess,
|
};
|
|
static const BackendHandleAccess kFlushRead_TextureHandleAccess =
|
kFlushRead_BackendHandleAccess;
|
static const BackendHandleAccess kFlushWrite_TextureHandleAccess =
|
kFlushWrite_BackendHandleAccess;
|
static const BackendHandleAccess kDiscardWrite_TextureHandleAccess =
|
kDiscardWrite_BackendHandleAccess;
|
##
|
|
#Const kFlushRead_BackendHandleAccess 0
|
#Line # back-end object is readable ##
|
Caller may read from the back-end object.
|
##
|
#Const kFlushWrite_BackendHandleAccess 1
|
#Line # back-end object is writable ##
|
Caller may write to the back-end object.
|
##
|
#Const kDiscardWrite_BackendHandleAccess 2
|
#Line # back-end object must be overwritten ##
|
Caller must overwrite the entire back-end object.
|
##
|
|
#NoExample
|
// todo: need to update example to use GrBackendTexture instead of GrBackendObject
|
#Platform gpu
|
SkPaint paint;
|
paint.setTextSize(32);
|
GrContext* context = canvas->getGrContext();
|
if (!context) {
|
canvas->drawString("GPU only!", 20, 40, paint);
|
return;
|
}
|
sk_sp<SkSurface> gpuSurface = SkSurface::MakeRenderTarget(
|
context, SkBudgeted::kYes, SkImageInfo::MakeN32Premul(10, 10));
|
int y = 20;
|
SkString str;
|
paint.setTextSize(16);
|
for (auto access : { SkSurface::kFlushRead_BackendHandleAccess,
|
SkSurface::kFlushWrite_BackendHandleAccess,
|
SkSurface::kDiscardWrite_BackendHandleAccess } ) {
|
sk_sp<SkImage> image(gpuSurface->makeImageSnapshot());
|
str.printf("uniqueID=%d", image->uniqueID());
|
canvas->drawString(str, 20, y += 20, paint);
|
GrBackendTexture backendTex = gpuSurface->getBackendTexture(access);
|
str.printf("backendTex is %svalid", backendTex.isValid() ? '' : 'not ');
|
canvas->drawString(str, 20, y += 20, paint);
|
}
|
sk_sp<SkImage> image(gpuSurface->makeImageSnapshot());
|
str.printf("final image uniqueID=%d", image->uniqueID());
|
canvas->drawString(str, 20, y += 20, paint);
|
##
|
|
#SeeAlso getBackendTexture getBackendRenderTarget
|
|
#Enum ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method GrBackendTexture getBackendTexture(BackendHandleAccess backendHandleAccess)
|
#In Property
|
#Line # returns the GPU reference to texture ##
|
#Populate
|
|
#NoExample
|
##
|
|
#SeeAlso GrBackendTexture BackendHandleAccess getBackendRenderTarget
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method GrBackendRenderTarget getBackendRenderTarget(BackendHandleAccess backendHandleAccess)
|
#In Property
|
#Line # returns the GPU reference to render target ##
|
#Populate
|
|
#NoExample
|
##
|
|
#SeeAlso GrBackendRenderTarget BackendHandleAccess getBackendTexture
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method SkCanvas* getCanvas()
|
#In Property
|
#Line # returns Canvas that draws into Surface ##
|
#Populate
|
|
#Example
|
#Height 64
|
sk_sp<SkSurface> surface(SkSurface::MakeRasterN32Premul(64, 64));
|
SkCanvas* surfaceCanvas = surface->getCanvas();
|
surfaceCanvas->clear(SK_ColorBLUE);
|
SkPaint paint;
|
paint.setTextSize(40);
|
surfaceCanvas->drawString("\xF0\x9F\x98\x81", 12, 45, paint);
|
surface->draw(canvas, 0, 0, nullptr);
|
##
|
|
#SeeAlso makeSurface makeImageSnapshot draw
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method sk_sp<SkSurface> makeSurface(const SkImageInfo& imageInfo)
|
#In Constructors
|
#Line # creates a compatible Surface ##
|
#Populate
|
|
#Example
|
#Height 96
|
sk_sp<SkSurface> big(SkSurface::MakeRasterN32Premul(64, 64));
|
sk_sp<SkSurface> lil(big->makeSurface(SkImageInfo::MakeN32(32, 32, kPremul_SkAlphaType)));
|
big->getCanvas()->clear(SK_ColorRED);
|
lil->getCanvas()->clear(SK_ColorBLACK);
|
SkPixmap pixmap;
|
if (big->peekPixels(&pixmap)) {
|
SkBitmap bigBits;
|
bigBits.installPixels(pixmap);
|
canvas->drawBitmap(bigBits, 0, 0);
|
}
|
if (lil->peekPixels(&pixmap)) {
|
SkBitmap lilBits;
|
lilBits.installPixels(pixmap);
|
canvas->drawBitmap(lilBits, 64, 64);
|
}
|
##
|
|
#SeeAlso makeImageSnapshot getCanvas draw
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method sk_sp<SkImage> makeImageSnapshot()
|
#In Constructors
|
#Line # creates Image capturing Surface contents ##
|
#Populate
|
|
#Example
|
#Height 64
|
sk_sp<SkSurface> big(SkSurface::MakeRasterN32Premul(64, 64));
|
sk_sp<SkSurface> lil(big->makeSurface(SkImageInfo::MakeN32(32, 32, kPremul_SkAlphaType)));
|
big->getCanvas()->clear(SK_ColorRED);
|
lil->getCanvas()->clear(SK_ColorBLACK);
|
sk_sp<SkImage> early(big->makeImageSnapshot());
|
lil->draw(big->getCanvas(), 16, 16, nullptr);
|
sk_sp<SkImage> later(big->makeImageSnapshot());
|
canvas->drawImage(early, 0, 0);
|
canvas->drawImage(later, 128, 0);
|
##
|
|
#SeeAlso draw getCanvas
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method sk_sp<SkImage> makeImageSnapshot(const SkIRect& bounds)
|
#In Constructors
|
#Line # creates Image capturing subset of Surface contents ##
|
#Populate
|
|
#Example
|
#Height 64
|
sk_sp<SkSurface> big(SkSurface::MakeRasterN32Premul(64, 64));
|
sk_sp<SkSurface> lil(big->makeSurface(SkImageInfo::MakeN32(32, 32, kPremul_SkAlphaType)));
|
big->getCanvas()->clear(SK_ColorRED);
|
lil->getCanvas()->clear(SK_ColorBLACK);
|
sk_sp<SkImage> early(big->makeImageSnapshot());
|
lil->draw(big->getCanvas(), 16, 16, nullptr);
|
sk_sp<SkImage> later(big->makeImageSnapshot({0, 0, 16, 16}));
|
canvas->drawImage(early, 0, 0);
|
canvas->drawImage(later, 0, 0);
|
##
|
|
#SeeAlso draw getCanvas
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
#Subtopic Pixels
|
#Line # functions with pixel access ##
|
##
|
|
#Method void draw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint)
|
#In Pixels
|
#Line # draws Surface contents to canvas ##
|
#Populate
|
|
#Example
|
#Height 64
|
sk_sp<SkSurface> big(SkSurface::MakeRasterN32Premul(64, 64));
|
sk_sp<SkSurface> lil(big->makeSurface(SkImageInfo::MakeN32(32, 32, kPremul_SkAlphaType)));
|
big->getCanvas()->clear(SK_ColorRED);
|
lil->getCanvas()->clear(SK_ColorBLACK);
|
lil->draw(big->getCanvas(), 16, 16, nullptr);
|
SkPixmap pixmap;
|
if (big->peekPixels(&pixmap)) {
|
SkBitmap bigBits;
|
bigBits.installPixels(pixmap);
|
canvas->drawBitmap(bigBits, 0, 0);
|
}
|
##
|
|
#SeeAlso makeImageSnapshot getCanvas
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method bool peekPixels(SkPixmap* pixmap)
|
#In Pixels
|
#Line # copies Surface parameters to Pixmap ##
|
#Populate
|
|
#Example
|
#Height 64
|
sk_sp<SkSurface> surf(SkSurface::MakeRasterN32Premul(64, 64));
|
auto surfCanvas = surf->getCanvas();
|
surfCanvas->clear(SK_ColorRED);
|
SkPaint paint;
|
paint.setTextSize(40);
|
surfCanvas->drawString("&", 16, 48, paint);
|
SkPixmap pixmap;
|
if (surf->peekPixels(&pixmap)) {
|
SkBitmap surfBits;
|
surfBits.installPixels(pixmap);
|
canvas->drawBitmap(surfBits, 0, 0);
|
}
|
##
|
|
#SeeAlso readPixels writePixels
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method bool readPixels(const SkPixmap& dst, int srcX, int srcY)
|
#In Pixels
|
#Line # copies Rect of pixels ##
|
Copies Rect of pixels to dst.
|
|
Source Rect corners are (srcX, srcY) and Surface (width(), height()).
|
Destination Rect corners are (0, 0) and (dst.width(), dst.height()).
|
Copies each readable pixel intersecting both rectangles, without scaling,
|
converting to dst.colorType() and dst.alphaType() if required.
|
|
Pixels are readable when Surface is raster, or backed by a GPU.
|
|
The destination pixel storage must be allocated by the caller.
|
|
Pixel values are converted only if Color_Type and Alpha_Type
|
do not match. Only pixels within both source and destination rectangles
|
are copied. dst contents outside Rect intersection are unchanged.
|
|
Pass negative values for srcX or srcY to offset pixels across or down destination.
|
|
Does not copy, and returns false if:
|
|
#List
|
# Source and destination rectangles do not intersect. ##
|
# Pixmap pixels could not be allocated. ##
|
# dst.rowBytes() is too small to contain one row of pixels. ##
|
##
|
|
#Param dst storage for pixels copied from Surface ##
|
#Param srcX offset into readable pixels on x-axis; may be negative ##
|
#Param srcY offset into readable pixels on y-axis; may be negative ##
|
|
#Return true if pixels were copied ##
|
|
#Example
|
#Height 32
|
sk_sp<SkSurface> surf(SkSurface::MakeRasterN32Premul(64, 64));
|
auto surfCanvas = surf->getCanvas();
|
surfCanvas->clear(SK_ColorRED);
|
SkPaint paint;
|
paint.setTextSize(40);
|
surfCanvas->drawString("&", 0, 32, paint);
|
std::vector<SkPMColor> storage;
|
storage.resize(surf->width() * surf->height());
|
SkPixmap pixmap(SkImageInfo::MakeN32Premul(32, 32), &storage.front(),
|
surf->width() * sizeof(storage[0]));
|
if (surf->readPixels(pixmap, 0, 0)) {
|
SkBitmap surfBits;
|
surfBits.installPixels(pixmap);
|
canvas->drawBitmap(surfBits, 0, 0);
|
}
|
##
|
|
#SeeAlso peekPixels writePixels
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
|
int srcX, int srcY)
|
|
Copies Rect of pixels from Canvas into dstPixels.
|
|
Source Rect corners are (srcX, srcY) and Surface (width(), height()).
|
Destination Rect corners are (0, 0) and (dstInfo.width(), dstInfo.height()).
|
Copies each readable pixel intersecting both rectangles, without scaling,
|
converting to dstInfo.colorType() and dstInfo.alphaType() if required.
|
|
Pixels are readable when Surface is raster, or backed by a GPU.
|
|
The destination pixel storage must be allocated by the caller.
|
|
Pixel values are converted only if Color_Type and Alpha_Type
|
do not match. Only pixels within both source and destination rectangles
|
are copied. dstPixels contents outside Rect intersection are unchanged.
|
|
Pass negative values for srcX or srcY to offset pixels across or down destination.
|
|
Does not copy, and returns false if:
|
|
#List
|
# Source and destination rectangles do not intersect. ##
|
# Surface pixels could not be converted to dstInfo.colorType() or dstInfo.alphaType(). ##
|
# dstRowBytes is too small to contain one row of pixels. ##
|
##
|
|
#Param dstInfo width, height, Color_Type, and Alpha_Type of dstPixels ##
|
#Param dstPixels storage for pixels; dstInfo.height() times dstRowBytes, or larger ##
|
#Param dstRowBytes size of one destination row; dstInfo.width() times pixel size, or larger ##
|
#Param srcX offset into readable pixels on x-axis; may be negative ##
|
#Param srcY offset into readable pixels on y-axis; may be negative ##
|
|
#Return true if pixels were copied ##
|
|
#Example
|
#Height 64
|
#Description
|
A black oval drawn on a red background provides an image to copy.
|
readPixels copies one quarter of the Surface into each of the four corners.
|
The copied quarter ovals overdraw the original oval.
|
##
|
sk_sp<SkSurface> surf(SkSurface::MakeRasterN32Premul(64, 64));
|
auto surfCanvas = surf->getCanvas();
|
surfCanvas->clear(SK_ColorRED);
|
SkPaint paint;
|
surfCanvas->drawOval({4, 8, 58, 54}, paint);
|
SkImageInfo info = SkImageInfo::Make(64, 64, kBGRA_8888_SkColorType, kPremul_SkAlphaType);
|
sk_sp<SkData> data(SkData::MakeUninitialized(info.minRowBytes() * info.height()));
|
sk_bzero(data->writable_data(), info.minRowBytes() * info.height());
|
for (int x : { 32, -32 } ) {
|
for (int y : { 32, -32 } ) {
|
surf->readPixels(info, data->writable_data(), info.minRowBytes(), x, y);
|
}
|
}
|
sk_sp<SkImage> image = SkImage::MakeRasterData(info, data, info.minRowBytes());
|
canvas->drawImage(image, 0, 0);
|
##
|
|
#SeeAlso peekPixels writePixels
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method bool readPixels(const SkBitmap& dst, int srcX, int srcY)
|
|
Copies Rect of pixels from Surface into bitmap.
|
|
Source Rect corners are (srcX, srcY) and Surface (width(), height()).
|
Destination Rect corners are (0, 0) and (bitmap.width(), bitmap.height()).
|
Copies each readable pixel intersecting both rectangles, without scaling,
|
converting to dst.colorType() and dst.alphaType() if required.
|
|
Pixels are readable when Surface is raster, or backed by a GPU.
|
|
The destination pixel storage must be allocated by the caller.
|
|
Pixel values are converted only if Color_Type and Alpha_Type
|
do not match. Only pixels within both source and destination rectangles
|
are copied. dst contents outside Rect intersection are unchanged.
|
|
Pass negative values for srcX or srcY to offset pixels across or down destination.
|
|
Does not copy, and returns false if:
|
|
#List
|
# Source and destination rectangles do not intersect. ##
|
# Surface pixels could not be converted to dst.colorType() or dst.alphaType(). ##
|
# dst pixels could not be allocated. ##
|
# dst.rowBytes() is too small to contain one row of pixels. ##
|
##
|
|
#Param dst storage for pixels copied from Surface ##
|
#Param srcX offset into readable pixels on x-axis; may be negative ##
|
#Param srcY offset into readable pixels on y-axis; may be negative ##
|
|
#Return true if pixels were copied ##
|
|
#Example
|
sk_sp<SkSurface> surf(SkSurface::MakeRasterN32Premul(64, 64));
|
auto surfCanvas = surf->getCanvas();
|
surfCanvas->clear(SK_ColorGREEN);
|
SkPaint paint;
|
surfCanvas->drawOval({2, 10, 58, 54}, paint);
|
SkImageInfo info = SkImageInfo::Make(64, 64, kBGRA_8888_SkColorType, kPremul_SkAlphaType);
|
SkBitmap bitmap;
|
bitmap.setInfo(info);
|
bitmap.allocPixels();
|
for (int x : { 32, -32 } ) {
|
for (int y : { 32, -32 } ) {
|
surf->readPixels(bitmap, x, y);
|
}
|
}
|
canvas->drawBitmap(bitmap, 0, 0);
|
##
|
|
#SeeAlso peekPixels writePixels
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method void writePixels(const SkPixmap& src, int dstX, int dstY)
|
#In Pixels
|
#Line # copies Rect of pixels ##
|
Copies Rect of pixels from the src Pixmap to the Surface.
|
|
Source Rect corners are (0, 0) and (src.width(), src.height()).
|
Destination Rect corners are (dstX, dstY) and
|
#Formula # (dstX + Surface width(), dstY + Surface height()) ##.
|
|
Copies each readable pixel intersecting both rectangles, without scaling,
|
converting to Surface SkColorType and SkAlphaType if required.
|
|
#Param src storage for pixels to copy to Surface ##
|
#Param dstX x-axis position relative to Surface to begin copy; may be negative ##
|
#Param dstY y-axis position relative to Surface to begin copy; may be negative ##
|
|
#Example
|
#Image 4
|
#Height 96
|
sk_sp<SkSurface> surf(SkSurface::MakeRasterN32Premul(64, 64));
|
auto surfCanvas = surf->getCanvas();
|
surfCanvas->clear(SK_ColorRED);
|
SkPaint paint;
|
paint.setTextSize(40);
|
surfCanvas->drawString("&", 16, 40, paint);
|
SkPixmap pixmap;
|
if (surf->peekPixels(&pixmap)) {
|
surf->writePixels(pixmap, 25, 25);
|
sk_sp<SkImage> image(surf->makeImageSnapshot());
|
canvas->drawImage(image, 0, 0);
|
}
|
##
|
|
#SeeAlso readPixels peekPixels
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method void writePixels(const SkBitmap& src, int dstX, int dstY)
|
|
Copies Rect of pixels from the src Bitmap to the Surface.
|
|
Source Rect corners are (0, 0) and (src.width(), src.height()).
|
Destination Rect corners are (dstX, dstY) and
|
#Formula # (dstX + Surface width(), dstY + Surface height()) ##.
|
|
Copies each readable pixel intersecting both rectangles, without scaling,
|
converting to Surface SkColorType and SkAlphaType if required.
|
|
#Param src storage for pixels to copy to Surface ##
|
#Param dstX x-axis position relative to Surface to begin copy; may be negative ##
|
#Param dstY y-axis position relative to Surface to begin copy; may be negative ##
|
|
#Example
|
#Image 4
|
#Height 96
|
sk_sp<SkSurface> surf(SkSurface::MakeRasterN32Premul(64, 64));
|
auto surfCanvas = surf->getCanvas();
|
surfCanvas->clear(SK_ColorGREEN);
|
surf->writePixels(source, 25, 25);
|
sk_sp<SkImage> image(surf->makeImageSnapshot());
|
canvas->drawImage(image, 0, 0);
|
##
|
|
#SeeAlso readPixels peekPixels
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method const SkSurfaceProps& props() const
|
#In Property
|
#Line # returns Surface_Properties ##
|
#Populate
|
|
#Example
|
const char* names[] = { "Unknown", "RGB_H", "BGR_H", "RGB_V", "BGR_V" };
|
sk_sp<SkSurface> surf(SkSurface::MakeRasterN32Premul(64, 64));
|
SkDebugf("surf.props(): k%s_SkPixelGeometry\n", names[surf->props().pixelGeometry()]);
|
#StdOut
|
surf.props(): kRGB_H_SkPixelGeometry
|
##
|
##
|
|
#SeeAlso SkSurfaceProps
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
#Subtopic Utility
|
#Line # rarely called management functions ##
|
##
|
|
#Method void flush()
|
#In Utility
|
#Line # resolves pending I/O ##
|
#Populate
|
|
#NoExample
|
##
|
|
#SeeAlso GrBackendSemaphore
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method GrSemaphoresSubmitted flushAndSignalSemaphores(int numSemaphores,
|
GrBackendSemaphore signalSemaphores[])
|
#In Utility
|
#Line # resolves pending I/O, and signal ##
|
#Populate
|
|
#NoExample
|
##
|
|
#SeeAlso wait GrBackendSemaphore
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method bool wait(int numSemaphores, const GrBackendSemaphore* waitSemaphores)
|
#In Utility
|
#Line # pauses commands until signaled ##
|
#Populate
|
|
#NoExample
|
#ToDo this is copy and paste silliness masquerading as an example. Probably need gpu
|
globals and definitely need gpu expertise to make a real example out of this
|
also, note need to replace GrBackendObject with GrBackendTexture
|
##
|
#Platform gpu
|
#Height 64
|
SkPaint paint;
|
paint.setTextSize(32);
|
GrContext* context = canvas->getGrContext();
|
if (!context) {
|
canvas->drawString("GPU only!", 20, 40, paint);
|
return;
|
}
|
GrBackendSemaphore semaphore;
|
sk_sp<SkSurface> surface = SkSurface::MakeRenderTarget(
|
context, SkBudgeted::kYes, SkImageInfo::MakeN32Premul(64, 64));
|
surface->flushAndSignalSemaphores(1, &semaphore);
|
sk_sp<SkImage> image = surface->makeImageSnapshot();
|
GrBackendTexture backendTex = image->getBackendTexture(false); // unused
|
SkASSERT(backendTex.isValid());
|
const SkImageInfo childImageInfo = SkImageInfo::Make(64, 64,
|
kRGBA_8888_SkColorType, kPremul_SkAlphaType);
|
sk_sp<SkSurface> childSurface(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo,
|
childImageInfo, 0, kTopLeft_GrSurfaceOrigin, nullptr));
|
GrBackendTexture backendTexture;
|
sk_sp<SkImage> childImage = SkImage::MakeFromTexture(context,
|
backendTexture, // undefined
|
kTopLeft_GrSurfaceOrigin, kPremul_SkAlphaType, nullptr);
|
SkCanvas* childCanvas = childSurface->getCanvas();
|
childCanvas->clear(SK_ColorRED);
|
childSurface->wait(1, &semaphore);
|
childCanvas->drawImage(childImage, 32, 0);
|
childSurface->draw(canvas, 0, 0, nullptr);
|
##
|
|
#SeeAlso flushAndSignalSemaphores GrBackendSemaphore
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method bool characterize(SkSurfaceCharacterization* characterization) const
|
#In Utility
|
#Line # sets Surface_Characterization for threaded GPU processing ##
|
#Populate
|
|
#Example
|
#Platform gpu
|
#Height 64
|
SkPaint paint;
|
paint.setTextSize(32);
|
GrContext* context = canvas->getGrContext();
|
if (!context) {
|
canvas->drawString("GPU only!", 20, 40, paint);
|
return;
|
}
|
sk_sp<SkSurface> gpuSurface = SkSurface::MakeRenderTarget(
|
context, SkBudgeted::kYes, SkImageInfo::MakeN32Premul(64, 64));
|
SkSurfaceCharacterization characterization;
|
if (!gpuSurface->characterize(&characterization)) {
|
canvas->drawString("characterization unsupported", 20, 40, paint);
|
return;
|
}
|
// start of threadable work
|
SkDeferredDisplayListRecorder recorder(characterization);
|
SkCanvas* subCanvas = recorder.getCanvas();
|
subCanvas->clear(SK_ColorGREEN);
|
std::unique_ptr<SkDeferredDisplayList> displayList = recorder.detach();
|
// end of threadable work
|
gpuSurface->draw(displayList.get());
|
sk_sp<SkImage> img = gpuSurface->makeImageSnapshot();
|
canvas->drawImage(std::move(img), 0, 0);
|
##
|
|
#SeeAlso draw() SkSurfaceCharacterization SkDeferredDisplayList
|
|
#Method ##
|
|
# ------------------------------------------------------------------------------
|
|
#Method bool draw(SkDeferredDisplayList* deferredDisplayList)
|
#Populate
|
|
#Example
|
#Height 64
|
#Platform gpu cpu
|
SkPaint paint;
|
paint.setTextSize(16);
|
sk_sp<SkSurface> gpuSurface = SkSurface::MakeRasterN32Premul(64, 64);
|
SkSurfaceCharacterization characterization;
|
if (!gpuSurface->characterize(&characterization)) {
|
canvas->drawString("characterization unsupported", 20, 40, paint);
|
return;
|
}
|
// start of threadable work
|
SkDeferredDisplayListRecorder recorder(characterization);
|
SkCanvas* subCanvas = recorder.getCanvas();
|
subCanvas->clear(SK_ColorGREEN);
|
std::unique_ptr<SkDeferredDisplayList> displayList = recorder.detach();
|
// end of threadable work
|
gpuSurface->draw(displayList.get());
|
sk_sp<SkImage> img = gpuSurface->makeImageSnapshot();
|
canvas->drawImage(std::move(img), 0, 0);
|
##
|
|
#SeeAlso characterize() SkSurfaceCharacterization SkDeferredDisplayList
|
|
#Method ##
|
|
#Class SkSurface ##
|
|
#Topic Surface ##
|
