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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/SkFilterQuality.h"
- #include "include/core/SkImage.h"
- #include "include/core/SkImageInfo.h"
- #include "include/core/SkMatrix.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkPoint.h"
- #include "include/core/SkRect.h"
- #include "include/core/SkRefCnt.h"
- #include "include/core/SkScalar.h"
- #include "include/core/SkShader.h"
- #include "include/core/SkSize.h"
- #include "include/core/SkString.h"
- #include "include/core/SkSurface.h"
- #include "include/core/SkTileMode.h"
- #include "include/core/SkTypes.h"
- #include "include/effects/SkGradientShader.h"
- #include "tools/ToolUtils.h"
- #include <algorithm>
- #include <initializer_list>
- #include <utility>
- // Makes a set of m x n tiled images to be drawn with SkCanvas::experimental_drawImageSetV1().
- static void make_image_tiles(int tileW, int tileH, int m, int n, const SkColor colors[4],
- SkCanvas::ImageSetEntry set[]) {
- const int w = tileW * m;
- const int h = tileH * n;
- auto surf = SkSurface::MakeRaster(
- SkImageInfo::Make(w, h, kRGBA_8888_SkColorType, kPremul_SkAlphaType));
- surf->getCanvas()->clear(SK_ColorLTGRAY);
- static constexpr SkScalar kStripeW = 10;
- static constexpr SkScalar kStripeSpacing = 30;
- SkPaint paint;
- SkPoint pts1[] = {{0.f, 0.f}, {(SkScalar)w, (SkScalar)h}};
- auto grad = SkGradientShader::MakeLinear(pts1, colors, nullptr, 2, SkTileMode::kClamp);
- paint.setShader(std::move(grad));
- paint.setAntiAlias(true);
- paint.setStyle(SkPaint::kStroke_Style);
- paint.setStrokeWidth(kStripeW);
- SkPoint stripePts[] = {{-w - kStripeW, -kStripeW}, {kStripeW, h + kStripeW}};
- while (stripePts[0].fX <= w) {
- surf->getCanvas()->drawPoints(SkCanvas::kLines_PointMode, 2, stripePts, paint);
- stripePts[0].fX += kStripeSpacing;
- stripePts[1].fX += kStripeSpacing;
- }
- SkPoint pts2[] = {{0.f, (SkScalar)h}, {(SkScalar)w, 0.f}};
- grad = SkGradientShader::MakeLinear(pts2, colors + 2, nullptr, 2, SkTileMode::kClamp);
- paint.setShader(std::move(grad));
- paint.setBlendMode(SkBlendMode::kMultiply);
- stripePts[0] = {-w - kStripeW, h + kStripeW};
- stripePts[1] = {kStripeW, -kStripeW};
- while (stripePts[0].fX <= w) {
- surf->getCanvas()->drawPoints(SkCanvas::kLines_PointMode, 2, stripePts, paint);
- stripePts[0].fX += kStripeSpacing;
- stripePts[1].fX += kStripeSpacing;
- }
- auto fullImage = surf->makeImageSnapshot();
- for (int y = 0; y < n; ++y) {
- for (int x = 0; x < m; ++x) {
- // Images will have 1 pixel of overlap at interior seams for filtering continuity.
- SkIRect subset = SkIRect::MakeXYWH(x * tileW - 1, y * tileH - 1, tileW + 2, tileH + 2);
- set[y * m + x].fAAFlags = SkCanvas::kNone_QuadAAFlags;
- if (x == 0) {
- subset.fLeft = 0;
- set[y * m + x].fAAFlags |= SkCanvas::kLeft_QuadAAFlag;
- }
- if (x == m - 1) {
- subset.fRight = w;
- set[y * m + x].fAAFlags |= SkCanvas::kRight_QuadAAFlag;
- }
- if (y == 0) {
- subset.fTop = 0;
- set[y * m + x].fAAFlags |= SkCanvas::kTop_QuadAAFlag;
- }
- if (y == n - 1) {
- subset.fBottom = h;
- set[y * m + x].fAAFlags |= SkCanvas::kBottom_QuadAAFlag;
- }
- set[y * m + x].fImage = fullImage->makeSubset(subset);
- set[y * m + x].fSrcRect =
- SkRect::MakeXYWH(x == 0 ? 0 : 1, y == 0 ? 0 : 1, tileW, tileH);
- set[y * m + x].fDstRect = SkRect::MakeXYWH(x * tileW, y * tileH, tileW, tileH);
- set[y * m + x].fAlpha = 1.f;
- SkASSERT(set[y * m + x].fImage);
- }
- }
- }
- namespace skiagm {
- class DrawImageSetGM : public GM {
- private:
- SkString onShortName() override { return SkString("draw_image_set"); }
- SkISize onISize() override { return {1000, 725}; }
- void onOnceBeforeDraw() override {
- static constexpr SkColor kColors[] = {SK_ColorCYAN, SK_ColorBLACK,
- SK_ColorMAGENTA, SK_ColorBLACK};
- make_image_tiles(kTileW, kTileH, kM, kN, kColors, fSet);
- }
- void onDraw(SkCanvas* canvas) override {
- SkScalar d = SkVector{kM * kTileW, kN * kTileH}.length();
- SkMatrix matrices[4];
- // rotation
- matrices[0].setRotate(30);
- matrices[0].postTranslate(d / 3, 0);
- // perespective
- SkPoint src[4];
- SkRect::MakeWH(kM * kTileW, kN * kTileH).toQuad(src);
- SkPoint dst[4] = {{0, 0},
- {kM * kTileW + 10.f, -5.f},
- {kM * kTileW - 28.f, kN * kTileH + 40.f},
- {45.f, kN * kTileH - 25.f}};
- SkAssertResult(matrices[1].setPolyToPoly(src, dst, 4));
- matrices[1].postTranslate(d, 50.f);
- // skew
- matrices[2].setRotate(-60.f);
- matrices[2].postSkew(0.5f, -1.15f);
- matrices[2].postScale(0.6f, 1.05f);
- matrices[2].postTranslate(d, 2.6f * d);
- // perspective + mirror in x.
- dst[1] = {-.25 * kM * kTileW, 0};
- dst[0] = {5.f / 4.f * kM * kTileW, 0};
- dst[3] = {2.f / 3.f * kM * kTileW, 1 / 2.f * kN * kTileH};
- dst[2] = {1.f / 3.f * kM * kTileW, 1 / 2.f * kN * kTileH - 0.1f * kTileH};
- SkAssertResult(matrices[3].setPolyToPoly(src, dst, 4));
- matrices[3].postTranslate(100.f, d);
- for (auto fm : {kNone_SkFilterQuality, kLow_SkFilterQuality}) {
- SkPaint setPaint;
- setPaint.setFilterQuality(fm);
- setPaint.setBlendMode(SkBlendMode::kSrcOver);
- for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) {
- // 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 < kM; ++x) {
- SkPoint pts[] = {{x * kTileW, 0}, {x * kTileW, kN * kTileH}};
- matrices[m].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 < kN; ++y) {
- SkPoint pts[] = {{0, y * kTileH}, {kTileW * kM, y * kTileH}};
- matrices[m].mapPoints(pts, 2);
- SkVector v = pts[1] - pts[0];
- v.setLength(v.length() + kLineOutset);
- canvas->drawLine(pts[1] - v, pts[0] + v, paint);
- }
- canvas->save();
- canvas->concat(matrices[m]);
- canvas->experimental_DrawEdgeAAImageSet(fSet, kM * kN, nullptr, nullptr, &setPaint,
- SkCanvas::kFast_SrcRectConstraint);
- canvas->restore();
- }
- // A more exotic case with an unusual blend mode, mixed aa flags set, and alpha,
- // subsets the image
- SkCanvas::ImageSetEntry entry;
- entry.fSrcRect = SkRect::MakeWH(kTileW, kTileH).makeInset(kTileW / 4.f, kTileH / 4.f);
- entry.fDstRect = SkRect::MakeWH(2 * kTileW, 2 * kTileH).makeOffset(d / 4, 2 * d);
- entry.fImage = fSet[0].fImage;
- entry.fAlpha = 0.7f;
- entry.fAAFlags = SkCanvas::kLeft_QuadAAFlag | SkCanvas::kTop_QuadAAFlag;
- canvas->save();
- canvas->rotate(3.f);
- setPaint.setBlendMode(SkBlendMode::kExclusion);
- canvas->experimental_DrawEdgeAAImageSet(&entry, 1, nullptr, nullptr, &setPaint,
- SkCanvas::kFast_SrcRectConstraint);
- canvas->restore();
- canvas->translate(2 * d, 0);
- }
- }
- static constexpr int kM = 4;
- static constexpr int kN = 3;
- static constexpr SkScalar kTileW = 30;
- static constexpr SkScalar kTileH = 60;
- SkCanvas::ImageSetEntry fSet[kM * kN];
- };
- // This GM exercises rect-stays-rect type matrices to test that filtering and antialiasing are not
- // incorrectly disabled.
- class DrawImageSetRectToRectGM : public GM {
- private:
- SkString onShortName() override { return SkString("draw_image_set_rect_to_rect"); }
- SkISize onISize() override { return {1250, 850}; }
- void onOnceBeforeDraw() override {
- static constexpr SkColor kColors[] = {SK_ColorBLUE, SK_ColorWHITE,
- SK_ColorRED, SK_ColorWHITE};
- make_image_tiles(kTileW, kTileH, kM, kN, kColors, fSet);
- }
- void onDraw(SkCanvas* canvas) override {
- ToolUtils::draw_checkerboard(canvas, SK_ColorBLACK, SK_ColorWHITE, 50);
- static constexpr SkScalar kW = kM * kTileW;
- static constexpr SkScalar kH = kN * kTileH;
- SkMatrix matrices[5];
- // Identity
- matrices[0].reset();
- // 90 degree rotation
- matrices[1].setRotate(90, kW / 2.f, kH / 2.f);
- // Scaling
- matrices[2].setScale(2.f, 0.5f);
- // Mirror in x and y
- matrices[3].setScale(-1.f, -1.f);
- matrices[3].postTranslate(kW, kH);
- // Mirror in y, rotate, and scale.
- matrices[4].setScale(1.f, -1.f);
- matrices[4].postTranslate(0, kH);
- matrices[4].postRotate(90, kW / 2.f, kH / 2.f);
- matrices[4].postScale(2.f, 0.5f);
- SkPaint paint;
- paint.setFilterQuality(kLow_SkFilterQuality);
- paint.setBlendMode(SkBlendMode::kSrcOver);
- static constexpr SkScalar kTranslate = SkTMax(kW, kH) * 2.f + 10.f;
- canvas->translate(5.f, 5.f);
- canvas->save();
- for (SkScalar frac : {0.f, 0.5f}) {
- canvas->save();
- canvas->translate(frac, frac);
- for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) {
- canvas->save();
- canvas->concat(matrices[m]);
- canvas->experimental_DrawEdgeAAImageSet(fSet, kM * kN, nullptr, nullptr, &paint,
- SkCanvas::kFast_SrcRectConstraint);
- canvas->restore();
- canvas->translate(kTranslate, 0);
- }
- canvas->restore();
- canvas->restore();
- canvas->translate(0, kTranslate);
- canvas->save();
- }
- for (SkVector scale : {SkVector{2.f, 0.5f}, SkVector{0.5, 2.f}}) {
- SkCanvas::ImageSetEntry scaledSet[kM * kN];
- std::copy_n(fSet, kM * kN, scaledSet);
- for (int i = 0; i < kM * kN; ++i) {
- scaledSet[i].fDstRect.fLeft *= scale.fX;
- scaledSet[i].fDstRect.fTop *= scale.fY;
- scaledSet[i].fDstRect.fRight *= scale.fX;
- scaledSet[i].fDstRect.fBottom *= scale.fY;
- scaledSet[i].fAlpha = 0 == (i % 3) ? 0.4f : 1.f;
- }
- for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) {
- canvas->save();
- canvas->concat(matrices[m]);
- canvas->experimental_DrawEdgeAAImageSet(scaledSet, kM * kN, nullptr, nullptr,
- &paint, SkCanvas::kFast_SrcRectConstraint);
- canvas->restore();
- canvas->translate(kTranslate, 0);
- }
- canvas->restore();
- canvas->translate(0, kTranslate);
- canvas->save();
- }
- }
- static constexpr int kM = 2;
- static constexpr int kN = 2;
- static constexpr int kTileW = 40;
- static constexpr int kTileH = 50;
- SkCanvas::ImageSetEntry fSet[kM * kN];
- };
- DEF_GM(return new DrawImageSetGM();)
- DEF_GM(return new DrawImageSetRectToRectGM();)
- } // namespace skiagm
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