/*
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* Copyright 2018 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 "gm.h"
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#include "GrClip.h"
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#include "GrContext.h"
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#include "GrRenderTargetContext.h"
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#include "GrSurfaceContextPriv.h"
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#include "SkGr.h"
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#include "SkGradientShader.h"
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static constexpr SkScalar kTileWidth = 40;
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static constexpr SkScalar kTileHeight = 30;
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static constexpr int kRowCount = 4;
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static constexpr int kColCount = 3;
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static void draw_text(SkCanvas* canvas, const char* text) {
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canvas->drawString(text, 0, 0, SkFont(nullptr, 12), SkPaint());
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}
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static void draw_gradient_tiles(SkCanvas* canvas, bool alignGradients) {
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// Always draw the same gradient
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static constexpr SkPoint pts[] = { {0.f, 0.f}, {0.25f * kTileWidth, 0.25f * kTileHeight} };
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static constexpr SkColor colors[] = { SK_ColorBLUE, SK_ColorWHITE };
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GrRenderTargetContext* rtc = canvas->internal_private_accessTopLayerRenderTargetContext();
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auto gradient = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kMirror_TileMode);
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SkPaint paint;
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paint.setShader(gradient);
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for (int i = 0; i < kRowCount; ++i) {
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for (int j = 0; j < kColCount; ++j) {
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SkRect tile = SkRect::MakeWH(kTileWidth, kTileHeight);
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if (alignGradients) {
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tile.offset(j * kTileWidth, i * kTileHeight);
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} else {
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canvas->save();
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canvas->translate(j * kTileWidth, i * kTileHeight);
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}
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unsigned aa = SkCanvas::kNone_QuadAAFlags;
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if (i == 0) {
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aa |= SkCanvas::kTop_QuadAAFlag;
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}
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if (i == kRowCount - 1) {
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aa |= SkCanvas::kBottom_QuadAAFlag;
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}
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if (j == 0) {
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aa |= SkCanvas::kLeft_QuadAAFlag;
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}
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if (j == kColCount - 1) {
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aa |= SkCanvas::kRight_QuadAAFlag;
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}
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if (rtc) {
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// Use non-public API to leverage general GrPaint capabilities
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SkMatrix view = canvas->getTotalMatrix();
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GrPaint grPaint;
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SkPaintToGrPaint(rtc->surfPriv().getContext(), rtc->colorSpaceInfo(), paint, view,
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&grPaint);
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rtc->fillRectWithEdgeAA(GrNoClip(), std::move(grPaint),
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static_cast<GrQuadAAFlags>(aa), view, tile);
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} else {
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// Fallback to solid color on raster backend since the public API only has color
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SkColor color = alignGradients ? SK_ColorBLUE
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: (i * kColCount + j) % 2 == 0 ? SK_ColorBLUE
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: SK_ColorWHITE;
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canvas->experimental_DrawEdgeAARectV1(
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tile, static_cast<SkCanvas::QuadAAFlags>(aa), color, SkBlendMode::kSrcOver);
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}
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if (!alignGradients) {
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// Pop off the matrix translation when drawing unaligned
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canvas->restore();
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}
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}
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}
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}
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static void draw_color_tiles(SkCanvas* canvas, bool multicolor) {
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for (int i = 0; i < kRowCount; ++i) {
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for (int j = 0; j < kColCount; ++j) {
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SkRect tile = SkRect::MakeXYWH(j * kTileWidth, i * kTileHeight, kTileWidth, kTileHeight);
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SkColor4f color;
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if (multicolor) {
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color = {(i + 1.f) / kRowCount, (j + 1.f) / kColCount, .4f, 1.f};
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} else {
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color = {.2f, .8f, .3f, 1.f};
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}
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unsigned aa = SkCanvas::kNone_QuadAAFlags;
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if (i == 0) {
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aa |= SkCanvas::kTop_QuadAAFlag;
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}
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if (i == kRowCount - 1) {
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aa |= SkCanvas::kBottom_QuadAAFlag;
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}
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if (j == 0) {
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aa |= SkCanvas::kLeft_QuadAAFlag;
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}
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if (j == kColCount - 1) {
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aa |= SkCanvas::kRight_QuadAAFlag;
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}
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canvas->experimental_DrawEdgeAARectV1(
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tile, static_cast<SkCanvas::QuadAAFlags>(aa), color.toSkColor(),
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SkBlendMode::kSrcOver);
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}
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}
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}
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static void draw_tile_boundaries(SkCanvas* canvas, const SkMatrix& local) {
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// Draw grid of red lines at interior tile boundaries.
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static constexpr SkScalar kLineOutset = 10.f;
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setColor(SK_ColorRED);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(0.f);
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for (int x = 1; x < kColCount; ++x) {
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SkPoint pts[] = {{x * kTileWidth, 0}, {x * kTileWidth, kRowCount * kTileHeight}};
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local.mapPoints(pts, 2);
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SkVector v = pts[1] - pts[0];
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v.setLength(v.length() + kLineOutset);
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canvas->drawLine(pts[1] - v, pts[0] + v, paint);
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}
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for (int y = 1; y < kRowCount; ++y) {
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SkPoint pts[] = {{0, y * kTileHeight}, {kTileWidth * kColCount, y * kTileHeight}};
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local.mapPoints(pts, 2);
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SkVector v = pts[1] - pts[0];
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v.setLength(v.length() + kLineOutset);
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canvas->drawLine(pts[1] - v, pts[0] + v, paint);
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}
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}
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// Tile renderers (column variation)
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typedef void (*TileRenderer)(SkCanvas*);
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static TileRenderer kTileSets[] = {
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[](SkCanvas* canvas) { draw_gradient_tiles(canvas, /* aligned */ false); },
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[](SkCanvas* canvas) { draw_gradient_tiles(canvas, /* aligned */ true); },
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[](SkCanvas* canvas) { draw_color_tiles(canvas, /* multicolor */ false); },
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[](SkCanvas* canvas) { draw_color_tiles(canvas, /* multicolor */true); },
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};
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static const char* kTileSetNames[] = { "Local", "Aligned", "Green", "Multicolor" };
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static_assert(SK_ARRAY_COUNT(kTileSets) == SK_ARRAY_COUNT(kTileSetNames), "Count mismatch");
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namespace skiagm {
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class DrawQuadSetGM : public GM {
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private:
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SkString onShortName() final { return SkString("draw_quad_set"); }
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SkISize onISize() override { return SkISize::Make(800, 800); }
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void onDraw(SkCanvas* canvas) override {
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SkMatrix rowMatrices[5];
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// Identity
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rowMatrices[0].setIdentity();
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// Translate/scale
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rowMatrices[1].setTranslate(5.5f, 20.25f);
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rowMatrices[1].postScale(.9f, .7f);
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// Rotation
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rowMatrices[2].setRotate(20.0f);
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rowMatrices[2].preTranslate(15.f, -20.f);
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// Skew
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rowMatrices[3].setSkew(.5f, .25f);
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rowMatrices[3].preTranslate(-30.f, 0.f);
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// Perspective
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SkPoint src[4];
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SkRect::MakeWH(kColCount * kTileWidth, kRowCount * kTileHeight).toQuad(src);
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SkPoint dst[4] = {{0, 0},
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{kColCount * kTileWidth + 10.f, 15.f},
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{kColCount * kTileWidth - 28.f, kRowCount * kTileHeight + 40.f},
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{25.f, kRowCount * kTileHeight - 15.f}};
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SkAssertResult(rowMatrices[4].setPolyToPoly(src, dst, 4));
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rowMatrices[4].preTranslate(0.f, +10.f);
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static const char* matrixNames[] = { "Identity", "T+S", "Rotate", "Skew", "Perspective" };
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static_assert(SK_ARRAY_COUNT(matrixNames) == SK_ARRAY_COUNT(rowMatrices), "Count mismatch");
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// Print a column header
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canvas->save();
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canvas->translate(110.f, 20.f);
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for (size_t j = 0; j < SK_ARRAY_COUNT(kTileSetNames); ++j) {
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draw_text(canvas, kTileSetNames[j]);
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canvas->translate(kColCount * kTileWidth + 30.f, 0.f);
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}
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canvas->restore();
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canvas->translate(0.f, 40.f);
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// Render all tile variations
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for (size_t i = 0; i < SK_ARRAY_COUNT(rowMatrices); ++i) {
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canvas->save();
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canvas->translate(10.f, 0.5f * kRowCount * kTileHeight);
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draw_text(canvas, matrixNames[i]);
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canvas->translate(100.f, -0.5f * kRowCount * kTileHeight);
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for (size_t j = 0; j < SK_ARRAY_COUNT(kTileSets); ++j) {
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canvas->save();
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draw_tile_boundaries(canvas, rowMatrices[i]);
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canvas->concat(rowMatrices[i]);
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kTileSets[j](canvas);
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// Undo the local transformation
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canvas->restore();
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// And advance to the next column
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canvas->translate(kColCount * kTileWidth + 30.f, 0.f);
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}
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// Reset back to the left edge
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canvas->restore();
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// And advance to the next row
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canvas->translate(0.f, kRowCount * kTileHeight + 20.f);
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}
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}
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};
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DEF_GM(return new DrawQuadSetGM();)
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} // namespace skiagm
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