/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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#include "sk_tool_utils.h"
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#include "Resources.h"
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#include "SkCanvas.h"
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#include "SkGradientShader.h"
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#include "SkStream.h"
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#include "SkTextBlob.h"
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#include "SkTypeface.h"
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namespace skiagm {
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class TextBlobColorTrans : public GM {
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public:
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// This gm tests that textblobs can be translated and have their colors regenerated
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// correctly. With smaller atlas sizes, it can also trigger regeneration of texture coords on
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// the GPU backend
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TextBlobColorTrans() { }
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protected:
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void onOnceBeforeDraw() override {
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SkTextBlobBuilder builder;
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// make textblob
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// Large text is used to trigger atlas eviction
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SkFont font(sk_tool_utils::create_portable_typeface(), 256);
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font.setEdging(SkFont::Edging::kAlias);
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const char* text = "AB";
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SkRect bounds;
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font.measureText(text, strlen(text), kUTF8_SkTextEncoding, &bounds);
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SkScalar yOffset = bounds.height();
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sk_tool_utils::add_to_text_blob(&builder, text, font, 0, yOffset - 30);
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// A8
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font.setSize(28);
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text = "The quick brown fox jumps over the lazy dog.";
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font.measureText(text, strlen(text), kUTF8_SkTextEncoding, &bounds);
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sk_tool_utils::add_to_text_blob(&builder, text, font, 0, yOffset - 8);
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// build
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fBlob = builder.make();
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}
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SkString onShortName() override {
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return SkString("textblobcolortrans");
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}
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SkISize onISize() override {
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return SkISize::Make(kWidth, kHeight);
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}
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void onDraw(SkCanvas* canvas) override {
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canvas->drawColor(SK_ColorGRAY);
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SkPaint paint;
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canvas->translate(10, 40);
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SkRect bounds = fBlob->bounds();
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// Colors were chosen to map to pairs of canonical colors. The GPU Backend will cache A8
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// Texture Blobs based on the canonical color they map to. Canonical colors are used to
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// create masks. For A8 there are 8 of them.
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SkColor colors[] = {SK_ColorCYAN, SK_ColorLTGRAY, SK_ColorYELLOW, SK_ColorWHITE};
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size_t count = SK_ARRAY_COUNT(colors);
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size_t colorIndex = 0;
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for (int y = 0; y + SkScalarFloorToInt(bounds.height()) < kHeight;
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y += SkScalarFloorToInt(bounds.height())) {
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paint.setColor(colors[colorIndex++ % count]);
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canvas->save();
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canvas->translate(0, SkIntToScalar(y));
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canvas->drawTextBlob(fBlob, 0, 0, paint);
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canvas->restore();
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}
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}
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private:
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sk_sp<SkTextBlob> fBlob;
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static constexpr int kWidth = 675;
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static constexpr int kHeight = 1600;
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typedef GM INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_GM(return new TextBlobColorTrans;)
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}
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