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/*
* Copyright 2015 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 "sk_tool_utils.h"
#include "Resources.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkStream.h"
#include "SkTextBlob.h"
#include "SkTypeface.h"
namespace skiagm {
class TextBlobColorTrans : public GM {
public:
// This gm tests that textblobs can be translated and have their colors regenerated
// correctly. With smaller atlas sizes, it can also trigger regeneration of texture coords on
// the GPU backend
TextBlobColorTrans() { }
protected:
void onOnceBeforeDraw() override {
SkTextBlobBuilder builder;
// make textblob
// Large text is used to trigger atlas eviction
SkPaint paint;
paint.setTextSize(256);
const char* text = "AB";
sk_tool_utils::set_portable_typeface(&paint);
SkRect bounds;
paint.measureText(text, strlen(text), &bounds);
SkScalar yOffset = bounds.height();
sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset - 30);
// A8
paint.setTextSize(28);
text = "The quick brown fox jumps over the lazy dog.";
paint.setSubpixelText(false);
paint.setLCDRenderText(false);
paint.measureText(text, strlen(text), &bounds);
sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset - 8);
// build
fBlob = builder.make();
}
SkString onShortName() override {
return SkString("textblobcolortrans");
}
SkISize onISize() override {
return SkISize::Make(kWidth, kHeight);
}
void onDraw(SkCanvas* canvas) override {
canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
SkPaint paint;
canvas->translate(10, 40);
SkRect bounds = fBlob->bounds();
// Colors were chosen to map to pairs of canonical colors. The GPU Backend will cache A8
// Texture Blobs based on the canonical color they map to. Canonical colors are used to
// create masks. For A8 there are 8 of them.
SkColor colors[] = {SK_ColorCYAN, sk_tool_utils::color_to_565(SK_ColorLTGRAY),
SK_ColorYELLOW, SK_ColorWHITE};
size_t count = SK_ARRAY_COUNT(colors);
size_t colorIndex = 0;
for (int y = 0; y + SkScalarFloorToInt(bounds.height()) < kHeight;
y += SkScalarFloorToInt(bounds.height())) {
paint.setColor(colors[colorIndex++ % count]);
canvas->save();
canvas->translate(0, SkIntToScalar(y));
canvas->drawTextBlob(fBlob, 0, 0, paint);
canvas->restore();
}
}
private:
sk_sp<SkTextBlob> fBlob;
static constexpr int kWidth = 675;
static constexpr int kHeight = 1600;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new TextBlobColorTrans;)
}
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