draw offscreen so we can see the alpha-channel we are writing
todo: know when to use a gpu-surface
git-svn-id: http://skia.googlecode.com/svn/trunk@6436 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/srcmode.cpp b/gm/srcmode.cpp
index 5ac102e..39f209b 100644
--- a/gm/srcmode.cpp
+++ b/gm/srcmode.cpp
@@ -8,6 +8,7 @@
#include "gm.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
+#include "SkSurface.h"
#define W SkIntToScalar(80)
#define H SkIntToScalar(60)
@@ -56,7 +57,7 @@
SkPath fPath;
public:
SrcModeGM() {
- this->setBGColor(0xFFDDDDDD);
+ this->setBGColor(SK_ColorBLACK);
}
protected:
@@ -68,7 +69,7 @@
return SkISize::Make(640, 760);
}
- virtual void onDraw(SkCanvas* canvas) {
+ void drawContent(SkCanvas* canvas) {
canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
SkPaint paint;
@@ -107,6 +108,24 @@
}
}
+ static SkSurface* compat_surface(SkCanvas* canvas, const SkISize& size) {
+ SkImage::Info info = {
+ size.width(),
+ size.height(),
+ SkImage::kPMColor_ColorType,
+ SkImage::kPremul_AlphaType
+ };
+ return SkSurface::NewRaster(info);
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ SkAutoTUnref<SkSurface> surf(compat_surface(canvas, this->getISize()));
+ surf->getCanvas()->drawColor(SK_ColorWHITE);
+ this->drawContent(surf->getCanvas());
+ surf->draw(canvas, 0, 0, NULL);
+
+ }
+
private:
typedef skiagm::GM INHERITED;
};