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defer creating offscreen until our first draw (so our constructor runs fast)

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git-svn-id: http://skia.googlecode.com/svn/trunk@2898 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@google.com 2011-12-20 13:41:09 +00:00
parent 20f7b61fd6
commit 5213c04216
1 changed files with 20 additions and 12 deletions
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32
gm/xfermodes.cpp
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@ -38,11 +38,12 @@ static void make_bitmaps(int w, int h, SkBitmap* src, SkBitmap* dst) {
c.drawRect(r, p);
}
static uint16_t gBG[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
static const uint16_t gBG[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
class XfermodesGM : public GM {
SkBitmap fBG;
SkBitmap fSrcB, fDstB;
bool fOnce;
void draw_mode(SkCanvas* canvas, SkXfermode* mode, int alpha,
SkScalar x, SkScalar y) {
@ -54,20 +55,25 @@ class XfermodesGM : public GM {
canvas->drawBitmap(fDstB, x, y, &p);
}
void init() {
if (!fOnce) {
// Do all this work in a temporary so we get a deep copy,
// especially of gBG.
SkBitmap scratchBitmap;
scratchBitmap.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4);
scratchBitmap.setPixels(gBG);
scratchBitmap.setIsOpaque(true);
scratchBitmap.copyTo(&fBG, SkBitmap::kARGB_4444_Config);
make_bitmaps(W, H, &fSrcB, &fDstB);
fOnce = true;
}
}
public:
const static int W = 64;
const static int H = 64;
XfermodesGM() {
// Do all this work in a temporary so we get a deep copy,
// especially of gBG.
SkBitmap scratchBitmap;
scratchBitmap.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4);
scratchBitmap.setPixels(gBG);
scratchBitmap.setIsOpaque(true);
scratchBitmap.copyTo(&fBG, SkBitmap::kARGB_4444_Config);
make_bitmaps(W, H, &fSrcB, &fDstB);
}
XfermodesGM() : fOnce(false) {}
protected:
virtual SkString onShortName() {
@ -79,6 +85,8 @@ protected:
}
virtual void onDraw(SkCanvas* canvas) {
this->init();
canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
const struct {