297 lines
8.8 KiB
C++
297 lines
8.8 KiB
C++
/*
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* Copyright 2011 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/gm.h"
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#include "include/core/SkBitmap.h"
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#include "include/core/SkBlendMode.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPoint.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkShader.h"
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#include "include/core/SkSize.h"
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#include "include/core/SkString.h"
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#include "include/core/SkSurface.h"
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#include "include/core/SkTileMode.h"
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#include "include/core/SkTypes.h"
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#include "include/effects/SkGradientShader.h"
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static sk_sp<SkImage> make_image() {
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auto surf = SkSurface::MakeRasterN32Premul(64, 64);
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auto canvas = surf->getCanvas();
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canvas->drawColor(SK_ColorRED);
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SkPaint paint;
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paint.setAntiAlias(true);
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const SkPoint pts[] = { { 0, 0 }, { 64, 64 } };
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const SkColor colors[] = { SK_ColorWHITE, SK_ColorBLUE };
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paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp));
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canvas->drawCircle(32, 32, 32, paint);
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return surf->makeImageSnapshot();
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}
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class DrawBitmapRect2 : public skiagm::GM {
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bool fUseIRect;
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public:
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DrawBitmapRect2(bool useIRect) : fUseIRect(useIRect) {
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}
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protected:
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SkString onShortName() override {
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SkString str;
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str.printf("bitmaprect_%s", fUseIRect ? "i" : "s");
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return str;
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}
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SkISize onISize() override {
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return SkISize::Make(640, 480);
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}
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void onDraw(SkCanvas* canvas) override {
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canvas->drawColor(0xFFCCCCCC);
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const SkIRect src[] = {
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{ 0, 0, 32, 32 },
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{ 0, 0, 80, 80 },
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{ 32, 32, 96, 96 },
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{ -32, -32, 32, 32, }
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};
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SkPaint paint;
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paint.setStyle(SkPaint::kStroke_Style);
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auto sampling = SkSamplingOptions();
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auto image = make_image();
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SkRect dstR = { 0, 200, 128, 380 };
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canvas->translate(16, 40);
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for (size_t i = 0; i < SK_ARRAY_COUNT(src); i++) {
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SkRect srcR;
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srcR.set(src[i]);
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canvas->drawImage(image, 0, 0, sampling, &paint);
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if (!fUseIRect) {
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canvas->drawImageRect(image.get(), srcR, dstR, sampling, &paint,
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SkCanvas::kStrict_SrcRectConstraint);
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} else {
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canvas->drawImageRect(image.get(), SkRect::Make(src[i]), dstR, sampling, &paint,
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SkCanvas::kStrict_SrcRectConstraint);
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}
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canvas->drawRect(dstR, paint);
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canvas->drawRect(srcR, paint);
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canvas->translate(160, 0);
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}
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}
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private:
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using INHERITED = skiagm::GM;
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};
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//////////////////////////////////////////////////////////////////////////////
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static void make_3x3_bitmap(SkBitmap* bitmap) {
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const int xSize = 3;
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const int ySize = 3;
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const SkColor textureData[xSize][ySize] = {
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{ SK_ColorRED, SK_ColorWHITE, SK_ColorBLUE },
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{ SK_ColorGREEN, SK_ColorBLACK, SK_ColorCYAN },
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{ SK_ColorYELLOW, SK_ColorGRAY, SK_ColorMAGENTA }
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};
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bitmap->allocN32Pixels(xSize, ySize, true);
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SkCanvas canvas(*bitmap);
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SkPaint paint;
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for (int y = 0; y < ySize; y++) {
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for (int x = 0; x < xSize; x++) {
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paint.setColor(textureData[x][y]);
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canvas.drawIRect(SkIRect::MakeXYWH(x, y, 1, 1), paint);
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}
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}
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}
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// This GM attempts to make visible any issues drawBitmapRect may have
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// with partial source rects. In this case the eight pixels on the border
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// should be half the width/height of the central pixel, i.e.:
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// __|____|__
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// | |
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// __|____|__
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// | |
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class DrawBitmapRect3 : public skiagm::GM {
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public:
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DrawBitmapRect3() {
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this->setBGColor(SK_ColorBLACK);
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}
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protected:
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SkString onShortName() override {
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SkString str;
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str.printf("3x3bitmaprect");
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return str;
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}
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SkISize onISize() override {
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return SkISize::Make(640, 480);
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}
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void onDraw(SkCanvas* canvas) override {
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SkBitmap bitmap;
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make_3x3_bitmap(&bitmap);
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SkRect srcR = { 0.5f, 0.5f, 2.5f, 2.5f };
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SkRect dstR = { 100, 100, 300, 200 };
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canvas->drawImageRect(bitmap.asImage(), srcR, dstR, SkSamplingOptions(),
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nullptr, SkCanvas::kStrict_SrcRectConstraint);
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}
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private:
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using INHERITED = skiagm::GM;
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};
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//////////////////////////////////////////////////////////////////////////////
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static sk_sp<SkImage> make_big_bitmap() {
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constexpr int gXSize = 4096;
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constexpr int gYSize = 4096;
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constexpr int gBorderWidth = 10;
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SkBitmap bitmap;
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bitmap.allocN32Pixels(gXSize, gYSize);
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for (int y = 0; y < gYSize; ++y) {
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for (int x = 0; x < gXSize; ++x) {
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if (x <= gBorderWidth || x >= gXSize-gBorderWidth ||
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y <= gBorderWidth || y >= gYSize-gBorderWidth) {
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*bitmap.getAddr32(x, y) = SkPreMultiplyColor(0x88FFFFFF);
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} else {
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*bitmap.getAddr32(x, y) = SkPreMultiplyColor(0x88FF0000);
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}
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}
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}
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bitmap.setImmutable();
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return bitmap.asImage();
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}
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// This GM attempts to reveal any issues we may have when the GPU has to
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// break up a large texture in order to draw it. The XOR transfer mode will
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// create stripes in the image if there is imprecision in the destination
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// tile placement.
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class DrawBitmapRect4 : public skiagm::GM {
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bool fUseIRect;
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sk_sp<SkImage> fBigImage;
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public:
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DrawBitmapRect4(bool useIRect) : fUseIRect(useIRect) {
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this->setBGColor(0x88444444);
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}
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protected:
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SkString onShortName() override {
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SkString str;
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str.printf("bigbitmaprect_%s", fUseIRect ? "i" : "s");
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return str;
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}
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SkISize onISize() override {
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return SkISize::Make(640, 480);
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}
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void onOnceBeforeDraw() override {
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fBigImage = make_big_bitmap();
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}
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void onDraw(SkCanvas* canvas) override {
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SkPaint paint;
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paint.setAlpha(128);
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paint.setBlendMode(SkBlendMode::kXor);
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SkSamplingOptions sampling;
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SkRect srcR1 = { 0.0f, 0.0f, 4096.0f, 2040.0f };
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SkRect dstR1 = { 10.1f, 10.1f, 629.9f, 400.9f };
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SkRect srcR2 = { 4085.0f, 10.0f, 4087.0f, 12.0f };
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SkRect dstR2 = { 10, 410, 30, 430 };
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if (!fUseIRect) {
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canvas->drawImageRect(fBigImage, srcR1, dstR1, sampling, &paint,
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SkCanvas::kStrict_SrcRectConstraint);
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canvas->drawImageRect(fBigImage, srcR2, dstR2, sampling, &paint,
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SkCanvas::kStrict_SrcRectConstraint);
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} else {
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canvas->drawImageRect(fBigImage, SkRect::Make(srcR1.roundOut()), dstR1, sampling,
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&paint, SkCanvas::kStrict_SrcRectConstraint);
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canvas->drawImageRect(fBigImage, SkRect::Make(srcR2.roundOut()), dstR2, sampling,
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&paint, SkCanvas::kStrict_SrcRectConstraint);
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}
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}
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private:
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using INHERITED = skiagm::GM;
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};
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class BitmapRectRounding : public skiagm::GM {
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SkBitmap fBM;
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public:
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BitmapRectRounding() {}
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protected:
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SkString onShortName() override {
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SkString str;
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str.printf("bitmaprect_rounding");
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return str;
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}
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SkISize onISize() override {
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return SkISize::Make(640, 480);
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}
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void onOnceBeforeDraw() override {
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fBM.allocN32Pixels(10, 10);
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fBM.eraseColor(SK_ColorBLUE);
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}
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// This choice of coordinates and matrix land the bottom edge of the clip (and bitmap dst)
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// at exactly 1/2 pixel boundary. However, drawBitmapRect may lose precision along the way.
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// If it does, we may see a red-line at the bottom, instead of the bitmap exactly matching
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// the clip (in which case we should see all blue).
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// The correct image should be all blue.
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void onDraw(SkCanvas* canvas) override {
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SkPaint paint;
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paint.setColor(SK_ColorRED);
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const SkRect r = SkRect::MakeXYWH(1, 1, 110, 114);
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canvas->scale(0.9f, 0.9f);
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// the drawRect shows the same problem as clipRect(r) followed by drawcolor(red)
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canvas->drawRect(r, paint);
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canvas->drawImageRect(fBM.asImage(), r, SkSamplingOptions());
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}
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private:
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using INHERITED = skiagm::GM;
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};
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DEF_GM( return new BitmapRectRounding; )
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//////////////////////////////////////////////////////////////////////////////
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DEF_GM( return new DrawBitmapRect2(false); )
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DEF_GM( return new DrawBitmapRect2(true); )
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DEF_GM( return new DrawBitmapRect3(); )
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#ifndef SK_BUILD_FOR_ANDROID
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DEF_GM( return new DrawBitmapRect4(false); )
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DEF_GM( return new DrawBitmapRect4(true); )
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#endif
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