blob: 1c6bd0783ba65e338255491dd3816696b5117ce7 [file] [log] [blame]
/*
* 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/gm.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkFont.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTextBlob.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkGradientShader.h"
#include "include/private/base/SkTDArray.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"
#include <math.h>
#include <string.h>
// This GM exercises drawTextBlob offset vs. shader space behavior.
class TextBlobShaderGM : public skiagm::GM {
public:
TextBlobShaderGM() {}
private:
void onOnceBeforeDraw() override {
{
SkFont font = ToolUtils::DefaultPortableFont();
const char* txt = "Blobber";
size_t txtLen = strlen(txt);
fGlyphs.append(font.countText(txt, txtLen, SkTextEncoding::kUTF8));
font.textToGlyphs(txt, txtLen, SkTextEncoding::kUTF8, fGlyphs.begin(), fGlyphs.size());
}
SkFont font = ToolUtils::DefaultPortableFont();
font.setSubpixel(true);
font.setEdging(SkFont::Edging::kAntiAlias);
font.setSize(30);
SkTextBlobBuilder builder;
int glyphCount = fGlyphs.size();
const SkTextBlobBuilder::RunBuffer* run;
run = &builder.allocRun(font, glyphCount, 10, 10, nullptr);
memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
run = &builder.allocRunPosH(font, glyphCount, 80, nullptr);
memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
for (int i = 0; i < glyphCount; ++i) {
run->pos[i] = font.getSize() * i * .75f;
}
run = &builder.allocRunPos(font, glyphCount, nullptr);
memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
for (int i = 0; i < glyphCount; ++i) {
run->pos[i * 2] = font.getSize() * 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[std::size(colors)];
for (unsigned i = 0; i < std::size(pos); ++i) {
pos[i] = (float)i / (std::size(pos) - 1);
}
SkISize sz = this->getISize();
fShader = SkGradientShader::MakeRadial(SkPoint::Make(SkIntToScalar(sz.width() / 2),
SkIntToScalar(sz.height() / 2)),
sz.width() * .66f, colors, pos,
std::size(colors),
SkTileMode::kRepeat);
}
SkString getName() const override { return SkString("textblobshader"); }
SkISize getISize() override { return SkISize::Make(640, 480); }
void onDraw(SkCanvas* canvas) override {
SkPaint p;
p.setAntiAlias(true);
p.setStyle(SkPaint::kFill_Style);
p.setShader(fShader);
SkISize sz = this->getISize();
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);
}
}
}
SkTDArray<uint16_t> fGlyphs;
sk_sp<SkTextBlob> fBlob;
sk_sp<SkShader> fShader;
using INHERITED = skiagm::GM;
};
DEF_GM(return new TextBlobShaderGM;)