blob: 15009d73142e04c2dfa8fd5ac46ea982f3b81751 [file] [log] [blame]
/*
* Copyright 2021 Google LLC
*
* 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/SkCanvas.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkSurface.h"
#include "include/effects/SkGradientShader.h"
#include "include/effects/SkRuntimeEffect.h"
#include "tools/Resources.h"
#include "tools/ToolUtils.h"
class RuntimeEffectImage : public skiagm::GM {
public:
RuntimeEffectImage() = default;
SkString onShortName() override { return SkString("runtime_effect_image"); }
SkISize onISize() override { return {800, 200}; }
protected:
void onOnceBeforeDraw() override {
SkString sksl(R"(
uniform shader child;
uniform half gAlphaType; // 0 is premul, non-zero unpremul.
half4 main(float2 p) {
half r = fract(p.x/20);
half g = fract(p.y/20);
half b = fract((p.x + 5)/10);
half a = min(distance(p, vec2(50, 50))/50 + 0.3, 1);
half4 result = half4(r, g, b, a);
result *= child.eval(p);
if (gAlphaType == 0) {
result.rgb *= a;
}
return result;
}
)");
auto [effect, error] = SkRuntimeEffect::MakeForShader(sksl);
if (!effect) {
SkDebugf("RuntimeShader error: %s\n", error.c_str());
}
fEffect = std::move(effect);
}
DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
GrRecordingContext* rc = canvas->recordingContext();
SkRuntimeShaderBuilder builder(fEffect);
SkImageInfo info = SkImageInfo::Make(100, 100, kRGBA_8888_SkColorType, kPremul_SkAlphaType);
SkSamplingOptions nn{SkFilterMode::kNearest};
SkSamplingOptions mm{SkFilterMode::kLinear, SkMipmapMode::kNearest};
auto whiteShader = SkShaders::Color(SK_ColorWHITE);
auto imageForShader = GetResourceAsImage("images/ducky.jpg");
if (!imageForShader) {
*errorMsg = "Could not load image";
return DrawResult::kFail;
}
auto imageShader = imageForShader->makeShader(SkTileMode::kRepeat,
SkTileMode::kRepeat,
SkSamplingOptions(SkFilterMode::kLinear),
SkMatrix::Scale(0.2f, 0.2f));
builder.uniform("gAlphaType") = 0.f;
builder.child("child") = whiteShader;
ToolUtils::draw_checkerboard(canvas, SK_ColorWHITE, SK_ColorLTGRAY, 50);
canvas->translate(5, 5);
SkPaint aaPaint;
aaPaint.setAntiAlias(true);
for (const auto& vm : {SkMatrix::Scale(1.5f, 1.5f), SkMatrix::Scale(0.3f, 0.3f)}) {
canvas->save();
canvas->concat(vm);
sk_sp<SkImage> image;
// basic
image = builder.makeImage(rc, nullptr, info, false);
canvas->drawImage(image, 0, 0, nn, &aaPaint);
canvas->translate(105, 0);
// local matrix
SkMatrix lm = SkMatrix::RotateDeg(45, {50, 50});
lm.preTranslate(10, 10);
image = builder.makeImage(rc, &lm, info, false);
canvas->drawImage(image, 0, 0, nn, &aaPaint);
canvas->translate(105, 0);
// unpremul
if (rc) {
// use a uniform to make the effect output be unpremul so it looks the same as the
// premul case when drawn to the canvas.
builder.uniform("gAlphaType") = 1.f;
image = builder.makeImage(rc,
nullptr,
info.makeAlphaType(kUnpremul_SkAlphaType),
false);
builder.uniform("gAlphaType") = 0.f;
canvas->drawImage(image, 0, 0, nn, &aaPaint);
canvas->translate(105, 0);
} else {
// CPU doesn't yet support making kUnpremul images. Just draw the basic one again.
image = builder.makeImage(nullptr, nullptr, info, false);
canvas->drawImage(image, 0, 0, nn, &aaPaint);
canvas->translate(105, 0);
}
// color space
sk_sp<SkColorSpace> cs = SkColorSpace::MakeSRGB()->makeColorSpin();
image = builder.makeImage(rc, nullptr, info.makeColorSpace(std::move(cs)), false);
canvas->drawImage(image, 0, 0, nn, &aaPaint);
canvas->translate(105, 0);
// mipmapped and different child
builder.child("child") = imageShader;
image = builder.makeImage(rc, nullptr, info, true);
builder.child("child") = whiteShader;
canvas->drawImage(image, 0, 0, mm, &aaPaint);
canvas->translate(105, 0);
canvas->restore();
canvas->translate(0, 105*vm.getScaleY());
}
return DrawResult::kOk;
}
private:
sk_sp<SkRuntimeEffect> fEffect;
};
DEF_GM(return new RuntimeEffectImage;)