241 lines
7.7 KiB
C++
241 lines
7.7 KiB
C++
/*
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* Copyright 2015 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/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkColorSpace.h"
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#include "include/core/SkData.h"
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#include "include/core/SkEncodedImageFormat.h"
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#include "include/core/SkImage.h"
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#include "include/core/SkImageInfo.h"
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#include "include/core/SkMatrix.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPicture.h"
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#include "include/core/SkPictureRecorder.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkRefCnt.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 <utility>
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static void draw_something(SkCanvas* canvas, const SkRect& bounds) {
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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(10);
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canvas->drawRect(bounds, paint);
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paint.setStyle(SkPaint::kFill_Style);
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paint.setColor(SK_ColorBLUE);
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canvas->drawOval(bounds, paint);
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}
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typedef sk_sp<SkImage> (*ImageMakerProc)(GrRecordingContext*, SkPicture*, const SkImageInfo&);
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static sk_sp<SkImage> make_raster(GrRecordingContext*,
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SkPicture* pic,
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const SkImageInfo& info) {
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auto surface(SkSurface::MakeRaster(info));
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surface->getCanvas()->clear(0);
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surface->getCanvas()->drawPicture(pic);
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return surface->makeImageSnapshot();
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}
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static sk_sp<SkImage> make_texture(GrRecordingContext* ctx,
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SkPicture* pic,
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const SkImageInfo& info) {
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if (!ctx) {
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return nullptr;
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}
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auto surface(SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info));
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if (!surface) {
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return nullptr;
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}
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surface->getCanvas()->clear(0);
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surface->getCanvas()->drawPicture(pic);
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return surface->makeImageSnapshot();
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}
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static sk_sp<SkImage> make_pict_gen(GrRecordingContext*,
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SkPicture* pic,
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const SkImageInfo& info) {
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return SkImage::MakeFromPicture(sk_ref_sp(pic), info.dimensions(), nullptr, nullptr,
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SkImage::BitDepth::kU8,
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SkColorSpace::MakeSRGB());
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}
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static sk_sp<SkImage> make_encode_gen(GrRecordingContext* ctx,
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SkPicture* pic,
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const SkImageInfo& info) {
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sk_sp<SkImage> src(make_raster(ctx, pic, info));
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if (!src) {
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return nullptr;
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}
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sk_sp<SkData> encoded = src->encodeToData(SkEncodedImageFormat::kPNG, 100);
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if (!encoded) {
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return nullptr;
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}
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return SkImage::MakeFromEncoded(std::move(encoded));
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}
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const ImageMakerProc gProcs[] = {
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make_raster,
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make_texture,
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make_pict_gen,
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make_encode_gen,
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};
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/*
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* Exercise drawing pictures inside an image, showing that the image version is pixelated
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* (correctly) when it is inside an image.
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*/
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class ImageShaderGM : public skiagm::GM {
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sk_sp<SkPicture> fPicture;
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public:
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ImageShaderGM() {}
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protected:
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SkString onShortName() override {
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return SkString("image-shader");
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}
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SkISize onISize() override {
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return SkISize::Make(850, 450);
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}
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void onOnceBeforeDraw() override {
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const SkRect bounds = SkRect::MakeWH(100, 100);
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SkPictureRecorder recorder;
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draw_something(recorder.beginRecording(bounds), bounds);
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fPicture = recorder.finishRecordingAsPicture();
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}
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void testImage(SkCanvas* canvas, SkImage* image) {
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SkAutoCanvasRestore acr(canvas, true);
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canvas->drawImage(image, 0, 0);
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canvas->translate(0, 120);
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const SkTileMode tile = SkTileMode::kRepeat;
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const SkMatrix localM = SkMatrix::Translate(-50, -50);
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SkPaint paint;
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paint.setShader(image->makeShader(tile, tile, SkSamplingOptions(), &localM));
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paint.setAntiAlias(true);
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canvas->drawCircle(50, 50, 50, paint);
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}
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void onDraw(SkCanvas* canvas) override {
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canvas->translate(20, 20);
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const SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
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for (size_t i = 0; i < SK_ARRAY_COUNT(gProcs); ++i) {
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sk_sp<SkImage> image(gProcs[i](canvas->recordingContext(), fPicture.get(), info));
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if (image) {
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this->testImage(canvas, image.get());
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}
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canvas->translate(120, 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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DEF_GM( return new ImageShaderGM; )
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//////////////////////////////////////////////////////////////////////////////////////////////
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#include "tools/ToolUtils.h"
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static sk_sp<SkImage> make_checker_img(int w, int h, SkColor c0, SkColor c1, int size) {
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SkBitmap bm = ToolUtils::create_checkerboard_bitmap(w, h, c0, c1, size);
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bm.setImmutable();
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return bm.asImage();
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}
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DEF_SIMPLE_GM(drawimage_sampling, canvas, 500, 500) {
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constexpr int N = 256;
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constexpr float kScale = 1.0f/6;
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const SkRect dst = {0, 0, kScale*N, kScale*N};
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auto img = make_checker_img(N, N, SK_ColorBLACK, SK_ColorWHITE, 7)->withDefaultMipmaps();
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const SkRect src = SkRect::MakeIWH(img->width(), img->height());
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SkMatrix mx = SkMatrix::RectToRect(src, dst);
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SkPaint paint;
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for (auto mm : {SkMipmapMode::kNone, SkMipmapMode::kNearest, SkMipmapMode::kLinear}) {
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for (auto fm : {SkFilterMode::kNearest, SkFilterMode::kLinear}) {
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SkSamplingOptions sampling(fm, mm);
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canvas->save();
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canvas->save();
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canvas->concat(mx);
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canvas->drawImage(img.get(), 0, 0, sampling);
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canvas->restore();
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canvas->translate(dst.width() + 4, 0);
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paint.setShader(img->makeShader(SkTileMode::kClamp, SkTileMode::kClamp, sampling, &mx));
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canvas->drawRect(dst, paint);
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canvas->translate(dst.width() + 4, 0);
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canvas->drawImageRect(img.get(), src, dst, sampling, nullptr,
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SkCanvas::kFast_SrcRectConstraint);
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canvas->restore();
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canvas->translate(0, dst.height() + 8);
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}
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}
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}
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// Test case for skbug.com/12685 (texture-backed image shaders silently fail drawing to CPU canvas)
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DEF_SIMPLE_GM(textureimage_and_shader, canvas, 100, 50) {
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canvas->clear(SK_ColorGREEN);
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sk_sp<SkImage> image;
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if (canvas->getSurface()) {
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image = canvas->getSurface()->makeImageSnapshot();
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canvas->clear(SK_ColorRED);
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} else {
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auto greenSurface = SkSurface::MakeRasterN32Premul(50, 50);
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greenSurface->getCanvas()->clear(SK_ColorGREEN);
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image = greenSurface->makeImageSnapshot();
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}
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// At this point, 'image' contains a green image. If our original canvas is GPU-backed, then
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// the snapped image will be a (GPU) texture. We will try to draw that image to a non-GPU
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// surface, to ensure that we get automatic read-back. If all goes well, we will get a pure
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// green result. If either draw fails, we'll get red (most likely).
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auto surface = SkSurface::MakeRasterN32Premul(50, 50);
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// First, use drawImage:
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surface->getCanvas()->clear(SK_ColorRED);
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surface->getCanvas()->drawImage(image, 0, 0);
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canvas->drawImage(surface->makeImageSnapshot(), 0, 0);
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// Now, use an image shader:
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SkPaint paint;
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paint.setShader(image->makeShader(SkSamplingOptions()));
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surface->getCanvas()->clear(SK_ColorRED);
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surface->getCanvas()->drawPaint(paint);
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canvas->drawImage(surface->makeImageSnapshot(), 50, 0);
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}
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