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