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/*
* Copyright 2018 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 TextBlob regeneration and the GPU font cache
// It's not necessary to run this with CPU configs
//
// The point here is to draw a set of text that will fit in one Plot, and then some large
// text. After a flush we draw the first set of text again with a slightly different color,
// and then enough new large text to spill the entire atlas. What *should* happen is that
// the Plot with the first set of text will not get overwritten by the new large text.
#include "gm.h"
#include "GrContext.h"
#include "GrContextPriv.h"
#include "GrContextOptions.h"
#include "SkCanvas.h"
#include "SkGraphics.h"
#include "SkImage.h"
#include "SkTypeface.h"
#include "gm.h"
#include "sk_tool_utils.h"
static sk_sp<SkTextBlob> make_blob(const SkString& text, const SkFont& font) {
size_t len = text.size();
SkAutoTArray<SkScalar> pos(len);
SkAutoTArray<SkGlyphID> glyphs(len);
font.textToGlyphs(text.c_str(), len, SkTextEncoding::kUTF8, glyphs.get(), len);
font.getXPos(glyphs.get(), len, pos.get());
return SkTextBlob::MakeFromPosTextH(text.c_str(), len, pos.get(), 0, font);
}
class FontRegenGM : public skiagm::GM {
public:
FontRegenGM() {
this->setBGColor(SK_ColorLTGRAY);
}
void modifyGrContextOptions(GrContextOptions* options) override {
options->fGlyphCacheTextureMaximumBytes = 0;
options->fAllowMultipleGlyphCacheTextures = GrContextOptions::Enable::kNo;
}
protected:
SkString onShortName() override {
SkString name("fontregen");
return name;
}
SkISize onISize() override { return SkISize::Make(kSize, kSize); }
void onOnceBeforeDraw() override {
auto tf = sk_tool_utils::create_portable_typeface("sans-serif", SkFontStyle::Normal());
static const SkString kTexts[] = {
SkString("abcdefghijklmnopqrstuvwxyz"),
SkString("ABCDEFGHI"),
SkString("NOPQRSTUV")
};
SkFont font;
font.setEdging(SkFont::Edging::kAntiAlias);
font.setSubpixel(false);
font.setSize(80);
font.setTypeface(tf);
fBlobs[0] = make_blob(kTexts[0], font);
font.setSize(162);
fBlobs[1] = make_blob(kTexts[1], font);
fBlobs[2] = make_blob(kTexts[2], font);
}
void onDraw(SkCanvas* canvas) override {
GrRenderTargetContext* renderTargetContext =
canvas->internal_private_accessTopLayerRenderTargetContext();
if (!renderTargetContext) {
skiagm::GM::DrawGpuOnlyMessage(canvas);
return;
}
SkPaint paint;
paint.setColor(SK_ColorBLACK);
canvas->drawTextBlob(fBlobs[0], 10, 80, paint);
canvas->drawTextBlob(fBlobs[1], 10, 225, paint);
canvas->flush();
paint.setColor(0xFF010101);
canvas->drawTextBlob(fBlobs[0], 10, 305, paint);
canvas->drawTextBlob(fBlobs[2], 10, 465, paint);
// Debugging tool for GPU.
static const bool kShowAtlas = false;
if (kShowAtlas) {
if (auto ctx = canvas->getGrContext()) {
auto img = ctx->contextPriv().getFontAtlasImage_ForTesting(kA8_GrMaskFormat);
canvas->drawImage(img, 200, 0);
}
}
}
private:
static constexpr SkScalar kSize = 512;
sk_sp<SkTextBlob> fBlobs[3];
typedef GM INHERITED;
};
constexpr SkScalar FontRegenGM::kSize;
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new FontRegenGM())
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