/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkPixmap.h"
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#include "SkBitmap.h"
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#include "SkColorData.h"
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#include "SkConvertPixels.h"
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#include "SkData.h"
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#include "SkDraw.h"
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#include "SkHalf.h"
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#include "SkImageInfoPriv.h"
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#include "SkImageShader.h"
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#include "SkMask.h"
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#include "SkNx.h"
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#include "SkPixmapPriv.h"
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#include "SkRasterClip.h"
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#include "SkReadPixelsRec.h"
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#include "SkSurface.h"
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#include "SkTemplates.h"
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#include "SkTo.h"
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#include "SkUnPreMultiply.h"
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#include "SkUtils.h"
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#include <utility>
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/////////////////////////////////////////////////////////////////////////////////////////////////
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void SkPixmap::reset() {
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fPixels = nullptr;
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fRowBytes = 0;
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fInfo = SkImageInfo::MakeUnknown();
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}
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void SkPixmap::reset(const SkImageInfo& info, const void* addr, size_t rowBytes) {
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if (addr) {
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SkASSERT(info.validRowBytes(rowBytes));
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}
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fPixels = addr;
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fRowBytes = rowBytes;
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fInfo = info;
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}
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bool SkPixmap::reset(const SkMask& src) {
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if (SkMask::kA8_Format == src.fFormat) {
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this->reset(SkImageInfo::MakeA8(src.fBounds.width(), src.fBounds.height()),
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src.fImage, src.fRowBytes);
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return true;
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}
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this->reset();
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return false;
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}
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void SkPixmap::setColorSpace(sk_sp<SkColorSpace> cs) {
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fInfo = fInfo.makeColorSpace(std::move(cs));
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}
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bool SkPixmap::extractSubset(SkPixmap* result, const SkIRect& subset) const {
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SkIRect srcRect, r;
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srcRect.set(0, 0, this->width(), this->height());
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if (!r.intersect(srcRect, subset)) {
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return false; // r is empty (i.e. no intersection)
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}
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// If the upper left of the rectangle was outside the bounds of this SkBitmap, we should have
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// exited above.
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SkASSERT(static_cast<unsigned>(r.fLeft) < static_cast<unsigned>(this->width()));
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SkASSERT(static_cast<unsigned>(r.fTop) < static_cast<unsigned>(this->height()));
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const void* pixels = nullptr;
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if (fPixels) {
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const size_t bpp = fInfo.bytesPerPixel();
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pixels = (const uint8_t*)fPixels + r.fTop * fRowBytes + r.fLeft * bpp;
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}
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result->reset(fInfo.makeWH(r.width(), r.height()), pixels, fRowBytes);
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return true;
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}
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// This is the same as SkPixmap::addr(x,y), but this version gets inlined, while the public
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// method does not. Perhaps we could bloat it so it can be inlined, but that would grow code-size
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// everywhere, instead of just here (on behalf of getAlphaf()).
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static const void* fast_getaddr(const SkPixmap& pm, int x, int y) {
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x <<= SkColorTypeShiftPerPixel(pm.colorType());
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return static_cast<const char*>(pm.addr()) + y * pm.rowBytes() + x;
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}
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float SkPixmap::getAlphaf(int x, int y) const {
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SkASSERT(this->addr());
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SkASSERT((unsigned)x < (unsigned)this->width());
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SkASSERT((unsigned)y < (unsigned)this->height());
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float value = 0;
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const void* srcPtr = fast_getaddr(*this, x, y);
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switch (this->colorType()) {
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case kUnknown_SkColorType:
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return 0;
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case kGray_8_SkColorType:
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case kRGB_565_SkColorType:
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case kRGB_888x_SkColorType:
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case kRGB_101010x_SkColorType:
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return 1;
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case kAlpha_8_SkColorType:
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value = static_cast<const uint8_t*>(srcPtr)[0] * (1.0f/255);
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break;
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case kARGB_4444_SkColorType: {
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uint16_t u16 = static_cast<const uint16_t*>(srcPtr)[0];
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value = SkGetPackedA4444(u16) * (1.0f/15);
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} break;
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case kRGBA_8888_SkColorType:
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case kBGRA_8888_SkColorType:
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value = static_cast<const uint8_t*>(srcPtr)[3] * (1.0f/255);
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break;
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case kRGBA_1010102_SkColorType: {
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uint32_t u32 = static_cast<const uint32_t*>(srcPtr)[0];
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value = (u32 >> 30) * (1.0f/3);
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} break;
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case kRGBA_F16_SkColorType: {
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uint64_t px;
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memcpy(&px, srcPtr, sizeof(px));
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value = SkHalfToFloat_finite_ftz(px)[3];
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} break;
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case kRGBA_F32_SkColorType:
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value = static_cast<const float*>(srcPtr)[3];
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break;
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}
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return value;
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}
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bool SkPixmap::readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
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int x, int y) const {
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if (!SkImageInfoValidConversion(dstInfo, fInfo)) {
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return false;
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}
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SkReadPixelsRec rec(dstInfo, dstPixels, dstRB, x, y);
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if (!rec.trim(fInfo.width(), fInfo.height())) {
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return false;
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}
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const void* srcPixels = this->addr(rec.fX, rec.fY);
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const SkImageInfo srcInfo = fInfo.makeWH(rec.fInfo.width(), rec.fInfo.height());
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SkConvertPixels(rec.fInfo, rec.fPixels, rec.fRowBytes, srcInfo, srcPixels, this->rowBytes());
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return true;
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}
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bool SkPixmap::erase(SkColor color, const SkIRect& subset) const {
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return this->erase(SkColor4f::FromColor(color), &subset);
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}
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bool SkPixmap::erase(const SkColor4f& color, const SkIRect* subset) const {
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SkPaint paint;
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paint.setBlendMode(SkBlendMode::kSrc);
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paint.setColor4f(color, this->colorSpace());
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SkIRect clip = this->bounds();
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if (subset && !clip.intersect(*subset)) {
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return false;
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}
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SkRasterClip rc{clip};
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SkDraw draw;
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draw.fDst = *this;
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draw.fMatrix = &SkMatrix::I();
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draw.fRC = &rc;
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draw.drawPaint(paint);
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return true;
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}
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bool SkPixmap::scalePixels(const SkPixmap& actualDst, SkFilterQuality quality) const {
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// We may need to tweak how we interpret these just a little below, so we make copies.
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SkPixmap src = *this,
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dst = actualDst;
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// Can't do anthing with empty src or dst
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if (src.width() <= 0 || src.height() <= 0 ||
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dst.width() <= 0 || dst.height() <= 0) {
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return false;
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}
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// no scaling involved?
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if (src.width() == dst.width() && src.height() == dst.height()) {
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return src.readPixels(dst);
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}
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// If src and dst are both unpremul, we'll fake the source out to appear as if premul,
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// and mark the destination as opaque. This odd combination allows us to scale unpremul
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// pixels without ever premultiplying them (perhaps losing information in the color channels).
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// This is an idiosyncratic feature of scalePixels(), and is tested by scalepixels_unpremul GM.
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bool clampAsIfUnpremul = false;
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if (src.alphaType() == kUnpremul_SkAlphaType &&
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dst.alphaType() == kUnpremul_SkAlphaType) {
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src.reset(src.info().makeAlphaType(kPremul_SkAlphaType), src.addr(), src.rowBytes());
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dst.reset(dst.info().makeAlphaType(kOpaque_SkAlphaType), dst.addr(), dst.rowBytes());
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// We'll need to tell the image shader to clamp to [0,1] instead of the
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// usual [0,a] when using a bicubic scaling (kHigh_SkFilterQuality).
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clampAsIfUnpremul = true;
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}
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SkBitmap bitmap;
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if (!bitmap.installPixels(src)) {
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return false;
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}
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bitmap.setImmutable(); // Don't copy when we create an image.
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bitmap.setIsVolatile(true); // Disable any caching.
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SkMatrix scale = SkMatrix::MakeRectToRect(SkRect::Make(src.bounds()),
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SkRect::Make(dst.bounds()),
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SkMatrix::kFill_ScaleToFit);
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// We'll create a shader to do this draw so we have control over the bicubic clamp.
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sk_sp<SkShader> shader = SkImageShader::Make(SkImage::MakeFromBitmap(bitmap),
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SkShader::kClamp_TileMode,
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SkShader::kClamp_TileMode,
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&scale,
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clampAsIfUnpremul);
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sk_sp<SkSurface> surface = SkSurface::MakeRasterDirect(dst.info(),
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dst.writable_addr(),
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dst.rowBytes());
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if (!shader || !surface) {
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return false;
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}
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SkPaint paint;
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paint.setBlendMode(SkBlendMode::kSrc);
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paint.setFilterQuality(quality);
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paint.setShader(std::move(shader));
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surface->getCanvas()->drawPaint(paint);
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return true;
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}
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//////////////////////////////////////////////////////////////////////////////////////////////////
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SkColor SkPixmap::getColor(int x, int y) const {
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SkASSERT(this->addr());
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SkASSERT((unsigned)x < (unsigned)this->width());
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SkASSERT((unsigned)y < (unsigned)this->height());
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const bool needsUnpremul = (kPremul_SkAlphaType == fInfo.alphaType());
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auto toColor = [needsUnpremul](uint32_t maybePremulColor) {
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return needsUnpremul ? SkUnPreMultiply::PMColorToColor(maybePremulColor)
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: SkSwizzle_BGRA_to_PMColor(maybePremulColor);
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};
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switch (this->colorType()) {
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case kGray_8_SkColorType: {
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uint8_t value = *this->addr8(x, y);
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return SkColorSetRGB(value, value, value);
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}
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case kAlpha_8_SkColorType: {
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return SkColorSetA(0, *this->addr8(x, y));
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}
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case kRGB_565_SkColorType: {
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return SkPixel16ToColor(*this->addr16(x, y));
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}
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case kARGB_4444_SkColorType: {
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uint16_t value = *this->addr16(x, y);
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SkPMColor c = SkPixel4444ToPixel32(value);
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return toColor(c);
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}
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case kRGB_888x_SkColorType: {
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uint32_t value = *this->addr32(x, y);
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return SkSwizzle_RB(value | 0xff000000);
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}
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case kBGRA_8888_SkColorType: {
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uint32_t value = *this->addr32(x, y);
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SkPMColor c = SkSwizzle_BGRA_to_PMColor(value);
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return toColor(c);
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}
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case kRGBA_8888_SkColorType: {
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uint32_t value = *this->addr32(x, y);
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SkPMColor c = SkSwizzle_RGBA_to_PMColor(value);
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return toColor(c);
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}
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case kRGB_101010x_SkColorType: {
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uint32_t value = *this->addr32(x, y);
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// Convert 10-bit rgb to 8-bit bgr, and mask in 0xff alpha at the top.
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return (uint32_t)( ((value >> 0) & 0x3ff) * (255/1023.0f) ) << 16
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| (uint32_t)( ((value >> 10) & 0x3ff) * (255/1023.0f) ) << 8
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| (uint32_t)( ((value >> 20) & 0x3ff) * (255/1023.0f) ) << 0
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| 0xff000000;
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}
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case kRGBA_1010102_SkColorType: {
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uint32_t value = *this->addr32(x, y);
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float r = ((value >> 0) & 0x3ff) * (1/1023.0f),
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g = ((value >> 10) & 0x3ff) * (1/1023.0f),
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b = ((value >> 20) & 0x3ff) * (1/1023.0f),
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a = ((value >> 30) & 0x3 ) * (1/ 3.0f);
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if (a != 0 && needsUnpremul) {
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r *= (1.0f/a);
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g *= (1.0f/a);
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b *= (1.0f/a);
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}
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return (uint32_t)( r * 255.0f ) << 16
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| (uint32_t)( g * 255.0f ) << 8
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| (uint32_t)( b * 255.0f ) << 0
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| (uint32_t)( a * 255.0f ) << 24;
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}
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case kRGBA_F16_SkColorType: {
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const uint64_t* addr =
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(const uint64_t*)fPixels + y * (fRowBytes >> 3) + x;
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Sk4f p4 = SkHalfToFloat_finite_ftz(*addr);
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if (p4[3] && needsUnpremul) {
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float inva = 1 / p4[3];
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p4 = p4 * Sk4f(inva, inva, inva, 1);
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}
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SkColor c;
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SkNx_cast<uint8_t>(p4 * Sk4f(255) + Sk4f(0.5f)).store(&c);
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// p4 is RGBA, but we want BGRA, so we need to swap next
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return SkSwizzle_RB(c);
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}
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case kRGBA_F32_SkColorType: {
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const float* rgba =
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(const float*)fPixels + 4*y*(fRowBytes >> 4) + 4*x;
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Sk4f p4 = Sk4f::Load(rgba);
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// From here on, just like F16:
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if (p4[3] && needsUnpremul) {
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float inva = 1 / p4[3];
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p4 = p4 * Sk4f(inva, inva, inva, 1);
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}
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SkColor c;
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SkNx_cast<uint8_t>(p4 * Sk4f(255) + Sk4f(0.5f)).store(&c);
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// p4 is RGBA, but we want BGRA, so we need to swap next
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return SkSwizzle_RB(c);
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}
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default:
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SkDEBUGFAIL("");
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return SkColorSetARGB(0, 0, 0, 0);
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}
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}
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bool SkPixmap::computeIsOpaque() const {
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const int height = this->height();
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const int width = this->width();
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switch (this->colorType()) {
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case kAlpha_8_SkColorType: {
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unsigned a = 0xFF;
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for (int y = 0; y < height; ++y) {
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const uint8_t* row = this->addr8(0, y);
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for (int x = 0; x < width; ++x) {
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a &= row[x];
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}
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if (0xFF != a) {
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return false;
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}
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}
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return true;
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} break;
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case kRGB_565_SkColorType:
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case kGray_8_SkColorType:
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case kRGB_888x_SkColorType:
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case kRGB_101010x_SkColorType:
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return true;
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break;
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case kARGB_4444_SkColorType: {
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unsigned c = 0xFFFF;
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for (int y = 0; y < height; ++y) {
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const SkPMColor16* row = this->addr16(0, y);
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for (int x = 0; x < width; ++x) {
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c &= row[x];
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}
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if (0xF != SkGetPackedA4444(c)) {
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return false;
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}
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}
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return true;
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} break;
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case kBGRA_8888_SkColorType:
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case kRGBA_8888_SkColorType: {
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SkPMColor c = (SkPMColor)~0;
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for (int y = 0; y < height; ++y) {
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const SkPMColor* row = this->addr32(0, y);
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for (int x = 0; x < width; ++x) {
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c &= row[x];
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}
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if (0xFF != SkGetPackedA32(c)) {
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return false;
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}
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}
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return true;
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}
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case kRGBA_F16_SkColorType: {
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const SkHalf* row = (const SkHalf*)this->addr();
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for (int y = 0; y < height; ++y) {
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for (int x = 0; x < width; ++x) {
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if (row[4 * x + 3] < SK_Half1) {
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return false;
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}
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}
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row += this->rowBytes() >> 1;
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}
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return true;
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}
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case kRGBA_F32_SkColorType: {
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const float* row = (const float*)this->addr();
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for (int y = 0; y < height; ++y) {
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for (int x = 0; x < width; ++x) {
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if (row[4 * x + 3] < 1.0f) {
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return false;
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}
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}
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row += this->rowBytes() >> 2;
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}
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return true;
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}
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case kRGBA_1010102_SkColorType: {
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uint32_t c = ~0;
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for (int y = 0; y < height; ++y) {
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const uint32_t* row = this->addr32(0, y);
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for (int x = 0; x < width; ++x) {
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c &= row[x];
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}
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if (0b11 != c >> 30) {
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return false;
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}
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}
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return true;
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}
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case kUnknown_SkColorType:
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SkDEBUGFAIL("");
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break;
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}
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return false;
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}
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//////////////////////////////////////////////////////////////////////////////////////////////////
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static bool draw_orientation(const SkPixmap& dst, const SkPixmap& src, SkEncodedOrigin origin) {
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auto surf = SkSurface::MakeRasterDirect(dst.info(), dst.writable_addr(), dst.rowBytes());
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if (!surf) {
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return false;
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}
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SkBitmap bm;
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bm.installPixels(src);
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SkMatrix m = SkEncodedOriginToMatrix(origin, src.width(), src.height());
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SkPaint p;
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p.setBlendMode(SkBlendMode::kSrc);
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surf->getCanvas()->concat(m);
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surf->getCanvas()->drawBitmap(bm, 0, 0, &p);
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return true;
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}
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bool SkPixmapPriv::Orient(const SkPixmap& dst, const SkPixmap& src, SkEncodedOrigin origin) {
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if (src.colorType() != dst.colorType()) {
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return false;
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}
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// note: we just ignore alphaType and colorSpace for this transformation
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int w = src.width();
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int h = src.height();
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if (ShouldSwapWidthHeight(origin)) {
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using std::swap;
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swap(w, h);
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}
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if (dst.width() != w || dst.height() != h) {
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return false;
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}
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if (w == 0 || h == 0) {
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return true;
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}
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// check for aliasing to self
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if (src.addr() == dst.addr()) {
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return kTopLeft_SkEncodedOrigin == origin;
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}
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return draw_orientation(dst, src, origin);
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}
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bool SkPixmapPriv::ShouldSwapWidthHeight(SkEncodedOrigin origin) {
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// The last four SkEncodedOrigin values involve 90 degree rotations
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return origin >= kLeftTop_SkEncodedOrigin;
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}
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SkImageInfo SkPixmapPriv::SwapWidthHeight(const SkImageInfo& info) {
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return info.makeWH(info.height(), info.width());
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}
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