/*
* 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 "SkBitmap.h"
#include "SkGradientShader.h"
#include "SkXfermode.h"
#include "SkColorPriv.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "SkGpuDevice.h"
#endif
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:
virtual SkString onShortName() SK_OVERRIDE {
return SkString("xfermodes3");
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(630, 1215);
}
virtual void onDrawBackground(SkCanvas* canvas) SK_OVERRIDE {
SkPaint bgPaint;
bgPaint.setColor(0xFF70D0E0);
canvas->drawPaint(bgPaint);
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
SkPaint labelP;
labelP.setAntiAlias(true);
static const SkColor kSolidColors[] = {
SK_ColorTRANSPARENT,
SK_ColorBLUE,
0x80808000
};
static const SkColor kBmpAlphas[] = {
0xff,
0x80,
};
SkAutoTUnref<SkCanvas> tempCanvas(this->possiblyCreateTempCanvas(canvas, kSize, kSize));
int test = 0;
int x = 0, y = 0;
static const 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 <= SkXfermode::kLastMode; ++m) {
SkXfermode::Mode mode = static_cast<SkXfermode::Mode>(m);
canvas->drawText(SkXfermode::ModeName(mode),
strlen(SkXfermode::ModeName(mode)),
SkIntToScalar(x),
SkIntToScalar(y + kSize + 3) + labelP.getTextSize(),
labelP);
for (size_t c = 0; c < SK_ARRAY_COUNT(kSolidColors); ++c) {
SkPaint modePaint;
modePaint.setXfermodeMode(mode);
modePaint.setColor(kSolidColors[c]);
modePaint.setStyle(kStrokes[s].fStyle);
modePaint.setStrokeWidth(kStrokes[s].fWidth);
this->drawMode(canvas, x, y, kSize, kSize, modePaint, tempCanvas.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.setXfermodeMode(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, tempCanvas.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 when running on a GPU canvas we explicitly create a temporary canvas using a texture with
* dimensions exactly matching the layer size.
*/
SkCanvas* possiblyCreateTempCanvas(SkCanvas* baseCanvas, int w, int h) {
SkCanvas* tempCanvas = NULL;
#if SK_SUPPORT_GPU
GrRenderTarget* rt = baseCanvas->getDevice()->accessRenderTarget();
if (NULL != rt) {
GrContext* context = rt->getContext();
GrTextureDesc desc;
desc.fWidth = w;
desc.fHeight = h;
desc.fConfig = rt->config();
desc.fFlags = kRenderTarget_GrTextureFlagBit;
SkAutoTUnref<GrSurface> surface(context->createUncachedTexture(desc, NULL, 0));
SkAutoTUnref<SkBaseDevice> device(SkGpuDevice::Create(surface.get()));
if (NULL != device.get()) {
tempCanvas = SkNEW_ARGS(SkCanvas, (device.get()));
}
}
#endif
return tempCanvas;
}
void drawMode(SkCanvas* canvas,
int x, int y, int w, int h,
const SkPaint& modePaint, SkCanvas* layerCanvas) {
canvas->save();
canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
SkRect r = SkRect::MakeWH(SkIntToScalar(w), SkIntToScalar(h));
SkCanvas* modeCanvas;
if (NULL == layerCanvas) {
canvas->saveLayer(&r, NULL);
modeCanvas = canvas;
} else {
modeCanvas = layerCanvas;
}
SkPaint bgPaint;
bgPaint.setAntiAlias(false);
bgPaint.setShader(fBGShader);
modeCanvas->drawRect(r, bgPaint);
modeCanvas->drawRect(r, modePaint);
modeCanvas = NULL;
if (NULL == layerCanvas) {
canvas->restore();
} else {
SkAutoROCanvasPixels ropixels(layerCanvas);
SkBitmap bitmap;
if (ropixels.asROBitmap(&bitmap)) {
canvas->drawBitmap(bitmap, 0, 0);
}
}
r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
SkPaint borderPaint;
borderPaint.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(r, borderPaint);
canvas->restore();
}
virtual void onOnceBeforeDraw() SK_OVERRIDE {
static const uint32_t kCheckData[] = {
SkPackARGB32(0xFF, 0x40, 0x40, 0x40),
SkPackARGB32(0xFF, 0xD0, 0xD0, 0xD0),
SkPackARGB32(0xFF, 0xD0, 0xD0, 0xD0),
SkPackARGB32(0xFF, 0x40, 0x40, 0x40)
};
SkBitmap bg;
bg.allocN32Pixels(2, 2, true);
SkAutoLockPixels bgAlp(bg);
memcpy(bg.getPixels(), kCheckData, sizeof(kCheckData));
SkMatrix lm;
lm.setScale(SkIntToScalar(kCheckSize), SkIntToScalar(kCheckSize));
fBGShader.reset(SkShader::CreateBitmapShader(bg,
SkShader::kRepeat_TileMode,
SkShader::kRepeat_TileMode,
&lm));
SkPaint bmpPaint;
static const SkPoint kCenter = { SkIntToScalar(kSize) / 2, SkIntToScalar(kSize) / 2 };
static const SkColor kColors[] = { SK_ColorTRANSPARENT, 0x80800000,
0xF020F060, SK_ColorWHITE };
bmpPaint.setShader(SkGradientShader::CreateRadial(kCenter,
3 * SkIntToScalar(kSize) / 4,
kColors,
NULL,
SK_ARRAY_COUNT(kColors),
SkShader::kRepeat_TileMode))->unref();
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.reset(SkShader::CreateBitmapShader(bmp,
SkShader::kClamp_TileMode,
SkShader::kClamp_TileMode));
}
enum {
kCheckSize = 8,
kSize = 30,
kTestsPerRow = 15,
};
SkAutoTUnref<SkShader> fBGShader;
SkAutoTUnref<SkShader> fBmpShader;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new Xfermodes3GM;)
}