126 lines
4.1 KiB
C++
126 lines
4.1 KiB
C++
/*
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* Copyright 2014 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/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkFont.h"
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#include "include/core/SkFontTypes.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPoint.h"
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkShader.h"
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#include "include/core/SkSize.h"
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#include "include/core/SkString.h"
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#include "include/core/SkTextBlob.h"
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#include "include/core/SkTileMode.h"
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#include "include/core/SkTypeface.h"
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#include "include/core/SkTypes.h"
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#include "include/effects/SkGradientShader.h"
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#include "include/private/SkTDArray.h"
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#include "tools/ToolUtils.h"
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#include <math.h>
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#include <string.h>
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// This GM exercises drawTextBlob offset vs. shader space behavior.
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class TextBlobShaderGM : public skiagm::GM {
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public:
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TextBlobShaderGM() {}
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private:
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void onOnceBeforeDraw() override {
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{
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SkFont font(ToolUtils::create_portable_typeface());
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const char* txt = "Blobber";
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size_t txtLen = strlen(txt);
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fGlyphs.append(font.countText(txt, txtLen, SkTextEncoding::kUTF8));
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font.textToGlyphs(txt, txtLen, SkTextEncoding::kUTF8, fGlyphs.begin(), fGlyphs.count());
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}
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SkFont font;
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font.setSubpixel(true);
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font.setEdging(SkFont::Edging::kAntiAlias);
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font.setSize(30);
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font.setTypeface(ToolUtils::create_portable_typeface());
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SkTextBlobBuilder builder;
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int glyphCount = fGlyphs.count();
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const SkTextBlobBuilder::RunBuffer* run;
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run = &builder.allocRun(font, glyphCount, 10, 10, nullptr);
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memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
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run = &builder.allocRunPosH(font, glyphCount, 80, nullptr);
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memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
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for (int i = 0; i < glyphCount; ++i) {
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run->pos[i] = font.getSize() * i * .75f;
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}
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run = &builder.allocRunPos(font, glyphCount, nullptr);
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memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
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for (int i = 0; i < glyphCount; ++i) {
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run->pos[i * 2] = font.getSize() * i * .75f;
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run->pos[i * 2 + 1] = 150 + 5 * sinf((float)i * 8 / glyphCount);
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}
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fBlob = builder.make();
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SkColor colors[2];
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colors[0] = SK_ColorRED;
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colors[1] = SK_ColorGREEN;
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SkScalar pos[SK_ARRAY_COUNT(colors)];
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for (unsigned i = 0; i < SK_ARRAY_COUNT(pos); ++i) {
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pos[i] = (float)i / (SK_ARRAY_COUNT(pos) - 1);
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}
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SkISize sz = this->onISize();
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fShader = SkGradientShader::MakeRadial(SkPoint::Make(SkIntToScalar(sz.width() / 2),
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SkIntToScalar(sz.height() / 2)),
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sz.width() * .66f, colors, pos,
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SK_ARRAY_COUNT(colors),
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SkTileMode::kRepeat);
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}
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SkString onShortName() override {
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return SkString("textblobshader");
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}
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SkISize onISize() override {
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return SkISize::Make(640, 480);
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}
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void onDraw(SkCanvas* canvas) override {
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SkPaint p;
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p.setAntiAlias(true);
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p.setStyle(SkPaint::kFill_Style);
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p.setShader(fShader);
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SkISize sz = this->onISize();
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constexpr int kXCount = 4;
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constexpr int kYCount = 3;
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for (int i = 0; i < kXCount; ++i) {
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for (int j = 0; j < kYCount; ++j) {
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canvas->drawTextBlob(fBlob,
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SkIntToScalar(i * sz.width() / kXCount),
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SkIntToScalar(j * sz.height() / kYCount),
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p);
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}
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}
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}
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SkTDArray<uint16_t> fGlyphs;
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sk_sp<SkTextBlob> fBlob;
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sk_sp<SkShader> fShader;
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using INHERITED = skiagm::GM;
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};
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DEF_GM(return new TextBlobShaderGM;)
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