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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 "GrContext.h"
#include "GrContextOptions.h"
#include "SkCanvas.h"
#include "SkGraphics.h"
#include "SkImage.h"
#include "SkTypeface.h"
#include "gm.h"
#include "sk_tool_utils.h"
// GM to stress the GPU font cache
static SkScalar draw_string(SkCanvas* canvas, const SkString& text, SkScalar x,
SkScalar y, const SkPaint& paint) {
canvas->drawString(text, x, y, paint);
return x + paint.measureText(text.c_str(), text.size());
}
class FontCacheGM : public skiagm::GM {
public:
FontCacheGM() { this->setBGColor(SK_ColorLTGRAY); }
void modifyGrContextOptions(GrContextOptions* options) override {
options->fGlyphCacheTextureMaximumBytes = 0;
options->fAllowMultipleGlyphCacheTextures = GrContextOptions::Enable::kNo;
}
protected:
SkString onShortName() override {
return SkString("fontcache");
}
SkISize onISize() override { return SkISize::Make(kSize, kSize); }
void onOnceBeforeDraw() override {
fTypefaces[0] = sk_tool_utils::create_portable_typeface("serif", SkFontStyle::Italic());
fTypefaces[1] = sk_tool_utils::create_portable_typeface("sans-serif",SkFontStyle::Italic());
fTypefaces[2] = sk_tool_utils::create_portable_typeface("serif", SkFontStyle::Normal());
fTypefaces[3] =
sk_tool_utils::create_portable_typeface("sans-serif", SkFontStyle::Normal());
fTypefaces[4] = sk_tool_utils::create_portable_typeface("serif", SkFontStyle::Bold());
fTypefaces[5] = sk_tool_utils::create_portable_typeface("sans-serif", SkFontStyle::Bold());
}
void onDraw(SkCanvas* canvas) override {
canvas->clear(SK_ColorLTGRAY);
this->drawText(canvas);
#if SK_SUPPORT_GPU
// Debugging tool for GPU.
static const bool kShowAtlas = false;
if (kShowAtlas) {
if (auto ctx = canvas->getGrContext()) {
auto img = ctx->getFontAtlasImage_ForTesting(kA8_GrMaskFormat);
canvas->drawImage(img, 0, 0);
}
}
#endif
}
private:
void drawText(SkCanvas* canvas) {
static const int kSizes[] = {8, 9, 10, 11, 12, 13, 18, 20, 25};
static const SkString kTexts[] = {SkString("ABCDEFGHIJKLMNOPQRSTUVWXYZ"),
SkString("abcdefghijklmnopqrstuvwxyz"),
SkString("0123456789"),
SkString("!@#$%^&*()<>[]{}")};
SkPaint paint;
paint.setAntiAlias(true);
paint.setLCDRenderText(false);
paint.setSubpixelText(true);
static const SkScalar kSubPixelInc = 1 / 2.f;
SkScalar x = 0;
SkScalar y = 10;
SkScalar subpixelX = 0;
SkScalar subpixelY = 0;
bool offsetX = true;
do {
for (auto s : kSizes) {
auto size = 2 * s;
paint.setTextSize(size);
for (const auto& typeface : fTypefaces) {
paint.setTypeface(typeface);
for (const auto& text : kTexts) {
x = size + draw_string(canvas, text, x + subpixelX, y + subpixelY, paint);
x = SkScalarCeilToScalar(x);
if (x + 100 > kSize) {
x = 0;
y += SkScalarCeilToScalar(size + 3);
if (y > kSize) {
return;
}
}
}
}
(offsetX ? subpixelX : subpixelY) += kSubPixelInc;
offsetX = !offsetX;
}
} while (true);
}
static constexpr SkScalar kSize = 1280;
sk_sp<SkTypeface> fTypefaces[6];
typedef GM INHERITED;
};
constexpr SkScalar FontCacheGM::kSize;
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new FontCacheGM;)
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