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247 lines
7.9 KiB
247 lines
7.9 KiB
/*
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* Copyright 2014 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 "sk_tool_utils.h"
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#include "SkGradientShader.h"
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#include "SkSurface.h"
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#include "SkSurfaceProps.h"
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#include "SkTextUtils.h"
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#define W 200
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#define H 100
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static sk_sp<SkShader> make_shader() {
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int a = 0x99;
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int b = 0xBB;
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SkPoint pts[] = { { 0, 0 }, { W, H } };
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SkColor colors[] = { SkColorSetRGB(a, a, a), SkColorSetRGB(b, b, b) };
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return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
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}
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static sk_sp<SkSurface> make_surface(GrContext* ctx, const SkImageInfo& info, SkPixelGeometry geo) {
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SkSurfaceProps props(0, geo);
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if (ctx) {
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return SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info, 0, &props);
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} else {
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return SkSurface::MakeRaster(info, &props);
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}
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}
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static void test_draw(SkCanvas* canvas, const char label[]) {
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setDither(true);
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paint.setShader(make_shader());
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canvas->drawRect(SkRect::MakeWH(W, H), paint);
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paint.setShader(nullptr);
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paint.setColor(SK_ColorWHITE);
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SkFont font(sk_tool_utils::create_portable_typeface(), 32);
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font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
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SkTextUtils::DrawString(canvas, label, W / 2, H * 3 / 4, font, paint,
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SkTextUtils::kCenter_Align);
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}
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class SurfacePropsGM : public skiagm::GM {
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public:
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SurfacePropsGM() {}
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protected:
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SkString onShortName() override {
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return SkString("surfaceprops");
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}
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SkISize onISize() override {
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return SkISize::Make(W, H * 5);
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}
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void onDraw(SkCanvas* canvas) override {
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GrContext* ctx = canvas->getGrContext();
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// must be opaque to have a hope of testing LCD text
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const SkImageInfo info = SkImageInfo::MakeN32(W, H, kOpaque_SkAlphaType);
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const struct {
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SkPixelGeometry fGeo;
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const char* fLabel;
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} recs[] = {
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{ kUnknown_SkPixelGeometry, "Unknown" },
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{ kRGB_H_SkPixelGeometry, "RGB_H" },
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{ kBGR_H_SkPixelGeometry, "BGR_H" },
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{ kRGB_V_SkPixelGeometry, "RGB_V" },
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{ kBGR_V_SkPixelGeometry, "BGR_V" },
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};
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SkScalar x = 0;
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SkScalar y = 0;
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for (const auto& rec : recs) {
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auto surface(make_surface(ctx, info, rec.fGeo));
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if (!surface) {
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SkDebugf("failed to create surface! label: %s", rec.fLabel);
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continue;
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}
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test_draw(surface->getCanvas(), rec.fLabel);
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surface->draw(canvas, x, y, nullptr);
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y += H;
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}
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}
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private:
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typedef GM INHERITED;
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};
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DEF_GM( return new SurfacePropsGM )
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#ifdef SK_DEBUG
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static bool equal(const SkSurfaceProps& a, const SkSurfaceProps& b) {
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return a.flags() == b.flags() && a.pixelGeometry() == b.pixelGeometry();
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}
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#endif
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class NewSurfaceGM : public skiagm::GM {
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public:
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NewSurfaceGM() {}
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protected:
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SkString onShortName() override {
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return SkString("surfacenew");
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}
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SkISize onISize() override {
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return SkISize::Make(300, 140);
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}
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static void drawInto(SkCanvas* canvas) {
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canvas->drawColor(SK_ColorRED);
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}
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void onDraw(SkCanvas* canvas) override {
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SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
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auto surf(sk_tool_utils::makeSurface(canvas, info, nullptr));
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drawInto(surf->getCanvas());
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sk_sp<SkImage> image(surf->makeImageSnapshot());
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canvas->drawImage(image, 10, 10, nullptr);
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auto surf2(surf->makeSurface(info));
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drawInto(surf2->getCanvas());
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// Assert that the props were communicated transitively through the first image
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SkASSERT(equal(surf->props(), surf2->props()));
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sk_sp<SkImage> image2(surf2->makeImageSnapshot());
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canvas->drawImage(image2.get(), 10 + SkIntToScalar(image->width()) + 10, 10, nullptr);
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}
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private:
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typedef GM INHERITED;
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};
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DEF_GM( return new NewSurfaceGM )
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///////////////////////////////////////////////////////////////////////////////////////////////////
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DEF_SIMPLE_GM(copy_on_write_retain, canvas, 256, 256) {
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const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256);
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sk_sp<SkSurface> surf = sk_tool_utils::makeSurface(canvas, info);
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surf->getCanvas()->clear(SK_ColorRED);
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// its important that image survives longer than the next draw, so the surface will see
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// an outstanding image, and have to decide if it should retain or discard those pixels
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sk_sp<SkImage> image = surf->makeImageSnapshot();
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// normally a clear+opaque should trigger the discard optimization, but since we have a clip
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// it should not (we need the previous red pixels).
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surf->getCanvas()->clipRect(SkRect::MakeWH(128, 256));
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surf->getCanvas()->clear(SK_ColorBLUE);
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// expect to see two rects: blue | red
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canvas->drawImage(surf->makeImageSnapshot(), 0, 0, nullptr);
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}
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DEF_SIMPLE_GM(copy_on_write_savelayer, canvas, 256, 256) {
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const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256);
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sk_sp<SkSurface> surf = sk_tool_utils::makeSurface(canvas, info);
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surf->getCanvas()->clear(SK_ColorRED);
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// its important that image survives longer than the next draw, so the surface will see
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// an outstanding image, and have to decide if it should retain or discard those pixels
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sk_sp<SkImage> image = surf->makeImageSnapshot();
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// now draw into a full-screen layer. This should (a) trigger a copy-on-write, but it should
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// not trigger discard, even tho its alpha (SK_ColorBLUE) is opaque, since it is in a layer
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// with a non-opaque paint.
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SkPaint paint;
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paint.setAlpha(0x40);
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surf->getCanvas()->saveLayer({0, 0, 256, 256}, &paint);
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surf->getCanvas()->clear(SK_ColorBLUE);
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surf->getCanvas()->restore();
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// expect to see two rects: blue blended on red
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canvas->drawImage(surf->makeImageSnapshot(), 0, 0, nullptr);
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}
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DEF_SIMPLE_GM(surface_underdraw, canvas, 256, 256) {
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SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256, nullptr);
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auto surf = sk_tool_utils::makeSurface(canvas, info);
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const SkIRect subset = SkIRect::MakeLTRB(180, 0, 256, 256);
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// noisy background
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{
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SkPoint pts[] = {{0, 0}, {40, 50}};
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SkColor colors[] = {SK_ColorRED, SK_ColorBLUE};
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auto sh = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kRepeat_TileMode);
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SkPaint paint;
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paint.setShader(sh);
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surf->getCanvas()->drawPaint(paint);
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}
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// save away the right-hand strip, then clear it
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sk_sp<SkImage> saveImg = surf->makeImageSnapshot(subset);
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{
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SkPaint paint;
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paint.setBlendMode(SkBlendMode::kClear);
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surf->getCanvas()->drawRect(SkRect::Make(subset), paint);
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}
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// draw the "foreground"
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{
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SkPaint paint;
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paint.setColor(SK_ColorGREEN);
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SkRect r = { 0, 10, 256, 35 };
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while (r.fBottom < 256) {
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surf->getCanvas()->drawRect(r, paint);
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r.offset(0, r.height() * 2);
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}
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}
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// apply the "fade"
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{
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SkPoint pts[] = {{SkIntToScalar(subset.left()), 0}, {SkIntToScalar(subset.right()), 0}};
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SkColor colors[] = {0xFF000000, 0};
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auto sh = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
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SkPaint paint;
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paint.setShader(sh);
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paint.setBlendMode(SkBlendMode::kDstIn);
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surf->getCanvas()->drawRect(SkRect::Make(subset), paint);
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}
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// restore the original strip, drawing it "under" the current foreground
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{
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SkPaint paint;
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paint.setBlendMode(SkBlendMode::kDstOver);
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surf->getCanvas()->drawImage(saveImg,
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SkIntToScalar(subset.left()), SkIntToScalar(subset.top()),
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&paint);
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}
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// show it on screen
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surf->draw(canvas, 0, 0, nullptr);
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}
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