skia2/gm/fontcache.cpp

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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.
*/
// GM to stress the GPU font cache
// It's not necessary to run this with CPU configs
#include "gm/gm.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkFont.h"
#include "include/core/SkFontStyle.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkPaint.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTypeface.h"
#include "include/gpu/GrContextOptions.h"
#include "include/gpu/GrDirectContext.h"
#include "include/private/GrTypesPriv.h"
#include "src/gpu/GrDirectContextPriv.h"
#include "tools/ToolUtils.h"
class GrSurfaceDrawContext;
static SkScalar draw_string(SkCanvas* canvas, const SkString& text, SkScalar x,
SkScalar y, const SkFont& font) {
SkPaint paint;
canvas->drawString(text, x, y, font, paint);
return x + font.measureText(text.c_str(), text.size(), SkTextEncoding::kUTF8);
}
class FontCacheGM : public skiagm::GM {
public:
FontCacheGM(GrContextOptions::Enable allowMultipleTextures)
: fAllowMultipleTextures(allowMultipleTextures) {
this->setBGColor(SK_ColorLTGRAY);
}
void modifyGrContextOptions(GrContextOptions* options) override {
options->fGlyphCacheTextureMaximumBytes = 0;
options->fAllowMultipleGlyphCacheTextures = fAllowMultipleTextures;
}
protected:
SkString onShortName() override {
SkString name("fontcache");
if (GrContextOptions::Enable::kYes == fAllowMultipleTextures) {
name.append("-mt");
}
return name;
}
SkISize onISize() override { return SkISize::Make(kSize, kSize); }
void onOnceBeforeDraw() override {
fTypefaces[0] = ToolUtils::create_portable_typeface("serif", SkFontStyle::Italic());
fTypefaces[1] = ToolUtils::create_portable_typeface("sans-serif", SkFontStyle::Italic());
fTypefaces[2] = ToolUtils::create_portable_typeface("serif", SkFontStyle::Normal());
fTypefaces[3] = ToolUtils::create_portable_typeface("sans-serif", SkFontStyle::Normal());
fTypefaces[4] = ToolUtils::create_portable_typeface("serif", SkFontStyle::Bold());
fTypefaces[5] = ToolUtils::create_portable_typeface("sans-serif", SkFontStyle::Bold());
}
void onDraw(SkCanvas* canvas) override {
this->drawText(canvas);
// Debugging tool for GPU.
static const bool kShowAtlas = false;
if (kShowAtlas) {
if (auto dContext = GrAsDirectContext(canvas->recordingContext())) {
auto img = dContext->priv().testingOnly_getFontAtlasImage(kA8_GrMaskFormat);
canvas->drawImage(img, 0, 0);
}
}
}
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("!@#$%^&*()<>[]{}")};
SkFont font;
font.setEdging(SkFont::Edging::kAntiAlias);
font.setSubpixel(true);
static const SkScalar kSubPixelInc = 1 / 2.f;
SkScalar x = 0;
SkScalar y = 10;
SkScalar subpixelX = 0;
SkScalar subpixelY = 0;
bool offsetX = true;
if (GrContextOptions::Enable::kYes == fAllowMultipleTextures) {
canvas->scale(10, 10);
}
do {
for (auto s : kSizes) {
auto size = 2 * s;
font.setSize(size);
for (const auto& typeface : fTypefaces) {
font.setTypeface(typeface);
for (const auto& text : kTexts) {
x = size + draw_string(canvas, text, x + subpixelX, y + subpixelY, font);
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;
GrContextOptions::Enable fAllowMultipleTextures;
sk_sp<SkTypeface> fTypefaces[6];
using INHERITED = GM;
};
constexpr SkScalar FontCacheGM::kSize;
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new FontCacheGM(GrContextOptions::Enable::kNo))
DEF_GM(return new FontCacheGM(GrContextOptions::Enable::kYes))