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/*
* Copyright 2014 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 "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkPoint.h"
#include "SkShader.h"
#include "SkTextBlob.h"
#include "SkTDArray.h"
#include "SkTypeface.h"
// This GM exercises drawTextBlob offset vs. shader space behavior.
class TextBlobShaderGM : public skiagm::GM {
public:
TextBlobShaderGM(const char* txt) {
SkPaint p;
sk_tool_utils::set_portable_typeface(&p);
size_t txtLen = strlen(txt);
fGlyphs.append(p.textToGlyphs(txt, txtLen, nullptr));
p.textToGlyphs(txt, txtLen, fGlyphs.begin());
}
protected:
void onOnceBeforeDraw() override {
SkPaint p;
p.setAntiAlias(true);
p.setSubpixelText(true);
p.setTextSize(30);
p.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
sk_tool_utils::set_portable_typeface(&p);
SkTextBlobBuilder builder;
int glyphCount = fGlyphs.count();
const SkTextBlobBuilder::RunBuffer* run;
run = &builder.allocRun(p, glyphCount, 10, 10, nullptr);
memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
run = &builder.allocRunPosH(p, glyphCount, 80, nullptr);
memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
for (int i = 0; i < glyphCount; ++i) {
run->pos[i] = p.getTextSize() * i * .75f;
}
run = &builder.allocRunPos(p, glyphCount, nullptr);
memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
for (int i = 0; i < glyphCount; ++i) {
run->pos[i * 2] = p.getTextSize() * i * .75f;
run->pos[i * 2 + 1] = 150 + 5 * sinf((float)i * 8 / glyphCount);
}
fBlob = builder.make();
SkColor colors[2];
colors[0] = SK_ColorRED;
colors[1] = SK_ColorGREEN;
SkScalar pos[SK_ARRAY_COUNT(colors)];
for (unsigned i = 0; i < SK_ARRAY_COUNT(pos); ++i) {
pos[i] = (float)i / (SK_ARRAY_COUNT(pos) - 1);
}
SkISize sz = this->onISize();
fShader = SkGradientShader::MakeRadial(SkPoint::Make(SkIntToScalar(sz.width() / 2),
SkIntToScalar(sz.height() / 2)),
sz.width() * .66f, colors, pos,
SK_ARRAY_COUNT(colors),
SkShader::kRepeat_TileMode);
}
SkString onShortName() override {
return SkString("textblobshader");
}
SkISize onISize() override {
return SkISize::Make(640, 480);
}
void onDraw(SkCanvas* canvas) override {
SkPaint p;
p.setStyle(SkPaint::kFill_Style);
p.setShader(fShader);
SkISize sz = this->onISize();
constexpr int kXCount = 4;
constexpr int kYCount = 3;
for (int i = 0; i < kXCount; ++i) {
for (int j = 0; j < kYCount; ++j) {
canvas->drawTextBlob(fBlob,
SkIntToScalar(i * sz.width() / kXCount),
SkIntToScalar(j * sz.height() / kYCount),
p);
}
}
}
private:
SkTDArray<uint16_t> fGlyphs;
sk_sp<SkTextBlob> fBlob;
sk_sp<SkShader> fShader;
typedef skiagm::GM INHERITED;
};
DEF_GM(return new TextBlobShaderGM("Blobber");)
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