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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 "SkCanvas.h"
#include "SkGraphics.h"
#include "SkTypeface.h"
// GM to stress the GPU font cache
const char* gFamilyNames[] = {
"sans-serif", "serif", "monospace"
};
const SkTypeface::Style gStyles[] = {
SkTypeface::kNormal, SkTypeface::kItalic
};
const SkScalar gTextSizes[] = {
12, 14, 16, 18, 20, 22, 24, 26, 28, 30
};
#define TYPEFACE_COUNT (SK_ARRAY_COUNT(gFamilyNames)*SK_ARRAY_COUNT(gStyles))
static SkScalar draw_string(SkCanvas* canvas, const SkString& text, SkScalar x,
SkScalar y, const SkPaint& paint) {
canvas->drawText(text.c_str(), text.size(), x, y, paint);
return x + paint.measureText(text.c_str(), text.size());
}
class FontCacheGM : public skiagm::GM {
public:
FontCacheGM() {
fName.set("fontcache");
}
virtual ~FontCacheGM() {
for (size_t i = 0; i < TYPEFACE_COUNT; ++i) {
SkSafeUnref(fTypefaces[i]);
}
}
protected:
virtual SkString onShortName() SK_OVERRIDE {
return fName;
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(640, 320);
}
virtual void onOnceBeforeDraw() SK_OVERRIDE {
int typefaceCount = 0;
for (size_t i = 0; i < SK_ARRAY_COUNT(gFamilyNames); ++i) {
for (size_t j = 0; j < SK_ARRAY_COUNT(gStyles); ++j) {
fTypefaces[typefaceCount++] = SkTypeface::CreateFromName(gFamilyNames[i],
gStyles[j]);
}
}
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
SkScalar y = 32;
SkPaint paint;
paint.setAntiAlias(true);
paint.setLCDRenderText(true);
paint.setSubpixelText(true);
SkString text("Ham");
// draw some initial text to partially fill the GPU cache
for (size_t i = 0; i < 2; ++i) {
paint.setTypeface(fTypefaces[i]);
SkScalar x = 20;
for (size_t j = 0; j < SK_ARRAY_COUNT(gTextSizes); ++j) {
paint.setTextSize(gTextSizes[j]);
x = draw_string(canvas, text, x, y, paint) + 19;
}
y += 32;
}
// force a flush
canvas->flush();
// draw again, and more to overflow the cache
for (size_t i = 0; i < TYPEFACE_COUNT; ++i) {
paint.setTypeface(fTypefaces[i]);
SkScalar x = 20;
for (size_t j = 0; j < SK_ARRAY_COUNT(gTextSizes); ++j) {
paint.setTextSize(gTextSizes[j]);
x = draw_string(canvas, text, x, y, paint) + 19;
}
y += 32;
}
}
virtual uint32_t onGetFlags() const SK_OVERRIDE {
// this GM is meant only for the GPU
return kGPUOnly_Flag;
}
private:
SkTypeface* fTypefaces[TYPEFACE_COUNT];
SkString fName;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return SkNEW(FontCacheGM); )
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