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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "sk_tool_utils.h"
#include "SkBitmap.h"
#include "SkGradientShader.h"
#include "SkSurface.h"
#include "SkBlendModePriv.h"
#include "SkColorPriv.h"
#include "GrContext.h"
namespace skiagm {
/**
* This tests drawing device-covering rects with solid colors and bitmap shaders over a
* checkerboard background using different xfermodes.
*/
class Xfermodes3GM : public GM {
public:
Xfermodes3GM() {}
protected:
SkString onShortName() override {
return SkString("xfermodes3");
}
SkISize onISize() override {
return SkISize::Make(630, 1215);
}
void onDrawBackground(SkCanvas* canvas) override {
SkPaint bgPaint;
bgPaint.setColor(sk_tool_utils::color_to_565(0xFF70D0E0));
canvas->drawPaint(bgPaint);
}
void onDraw(SkCanvas* canvas) override {
canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
SkPaint labelP;
labelP.setAntiAlias(true);
sk_tool_utils::set_portable_typeface(&labelP);
constexpr SkColor kSolidColors[] = {
SK_ColorTRANSPARENT,
SK_ColorBLUE,
0x80808000
};
constexpr SkColor kBmpAlphas[] = {
0xff,
0x80,
};
auto tempSurface(this->makeTempSurface(canvas, kSize, kSize));
int test = 0;
int x = 0, y = 0;
constexpr struct { SkPaint::Style fStyle; SkScalar fWidth; } kStrokes[] = {
{SkPaint::kFill_Style, 0},
{SkPaint::kStroke_Style, SkIntToScalar(kSize) / 2},
};
for (size_t s = 0; s < SK_ARRAY_COUNT(kStrokes); ++s) {
for (size_t m = 0; m <= (size_t)SkBlendMode::kLastMode; ++m) {
SkBlendMode mode = static_cast<SkBlendMode>(m);
canvas->drawString(SkBlendMode_Name(mode),
SkIntToScalar(x),
SkIntToScalar(y + kSize + 3) + labelP.getTextSize(),
labelP);
for (size_t c = 0; c < SK_ARRAY_COUNT(kSolidColors); ++c) {
SkPaint modePaint;
modePaint.setBlendMode(mode);
modePaint.setColor(kSolidColors[c]);
modePaint.setStyle(kStrokes[s].fStyle);
modePaint.setStrokeWidth(kStrokes[s].fWidth);
this->drawMode(canvas, x, y, kSize, kSize, modePaint, tempSurface.get());
++test;
x += kSize + 10;
if (!(test % kTestsPerRow)) {
x = 0;
y += kSize + 30;
}
}
for (size_t a = 0; a < SK_ARRAY_COUNT(kBmpAlphas); ++a) {
SkPaint modePaint;
modePaint.setBlendMode(mode);
modePaint.setAlpha(kBmpAlphas[a]);
modePaint.setShader(fBmpShader);
modePaint.setStyle(kStrokes[s].fStyle);
modePaint.setStrokeWidth(kStrokes[s].fWidth);
this->drawMode(canvas, x, y, kSize, kSize, modePaint, tempSurface.get());
++test;
x += kSize + 10;
if (!(test % kTestsPerRow)) {
x = 0;
y += kSize + 30;
}
}
}
}
}
private:
/**
* GrContext has optimizations around full rendertarget draws that can be replaced with clears.
* We are trying to test those. We could use saveLayer() to create small SkGpuDevices but
* saveLayer() uses the texture cache. This means that the actual render target may be larger
* than the layer. Because the clip will contain the layer's bounds, no draws will be full-RT.
* So explicitly create a temporary canvas with dimensions exactly the layer size.
*/
sk_sp<SkSurface> makeTempSurface(SkCanvas* baseCanvas, int w, int h) {
SkImageInfo baseInfo = baseCanvas->imageInfo();
SkImageInfo info = SkImageInfo::Make(w, h, baseInfo.colorType(), baseInfo.alphaType(),
baseInfo.refColorSpace());
return baseCanvas->makeSurface(info);
}
void drawMode(SkCanvas* canvas,
int x, int y, int w, int h,
const SkPaint& modePaint, SkSurface* surface) {
canvas->save();
canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
SkRect r = SkRect::MakeWH(SkIntToScalar(w), SkIntToScalar(h));
SkCanvas* modeCanvas;
if (nullptr == surface) {
canvas->saveLayer(&r, nullptr);
canvas->clipRect(r);
modeCanvas = canvas;
} else {
modeCanvas = surface->getCanvas();
}
SkPaint bgPaint;
bgPaint.setAntiAlias(false);
bgPaint.setShader(fBGShader);
modeCanvas->drawRect(r, bgPaint);
modeCanvas->drawRect(r, modePaint);
modeCanvas = nullptr;
if (nullptr == surface) {
canvas->restore();
} else {
surface->draw(canvas, 0, 0, nullptr);
}
r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
SkPaint borderPaint;
borderPaint.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(r, borderPaint);
canvas->restore();
}
void onOnceBeforeDraw() override {
const uint32_t kCheckData[] = {
SkPackARGB32(0xFF, 0x42, 0x41, 0x42),
SkPackARGB32(0xFF, 0xD6, 0xD3, 0xD6),
SkPackARGB32(0xFF, 0xD6, 0xD3, 0xD6),
SkPackARGB32(0xFF, 0x42, 0x41, 0x42)
};
SkBitmap bg;
bg.allocN32Pixels(2, 2, true);
memcpy(bg.getPixels(), kCheckData, sizeof(kCheckData));
SkMatrix lm;
lm.setScale(SkIntToScalar(kCheckSize), SkIntToScalar(kCheckSize));
fBGShader = SkShader::MakeBitmapShader(bg, SkShader::kRepeat_TileMode,
SkShader::kRepeat_TileMode, &lm);
SkPaint bmpPaint;
const SkPoint kCenter = { SkIntToScalar(kSize) / 2, SkIntToScalar(kSize) / 2 };
const SkColor kColors[] = {
SK_ColorTRANSPARENT, 0x80800000, 0xF020F060, SK_ColorWHITE
};
bmpPaint.setShader(SkGradientShader::MakeRadial(kCenter, 3 * SkIntToScalar(kSize) / 4,
kColors, nullptr, SK_ARRAY_COUNT(kColors),
SkShader::kRepeat_TileMode));
SkBitmap bmp;
bmp.allocN32Pixels(kSize, kSize);
SkCanvas bmpCanvas(bmp);
bmpCanvas.clear(SK_ColorTRANSPARENT);
SkRect rect = { SkIntToScalar(kSize) / 8, SkIntToScalar(kSize) / 8,
7 * SkIntToScalar(kSize) / 8, 7 * SkIntToScalar(kSize) / 8};
bmpCanvas.drawRect(rect, bmpPaint);
fBmpShader = SkShader::MakeBitmapShader(bmp, SkShader::kClamp_TileMode,
SkShader::kClamp_TileMode);
}
enum {
kCheckSize = 8,
kSize = 30,
kTestsPerRow = 15,
};
sk_sp<SkShader> fBGShader;
sk_sp<SkShader> fBmpShader;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new Xfermodes3GM;)
}
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