8483326704
Blink would like drawTextBlob(x,y) to behave the same as drawText(x,y) WRT shader space. Due to the current generic device base impl, that is not the case. This is a transitional workaround, pending proper drawTextBlob impls in SkDevice classes. R=reed@google.com, robertphillips@google.com Author: fmalita@chromium.org Review URL: https://codereview.chromium.org/586743002
115 lines
3.6 KiB
C++
115 lines
3.6 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.h"
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#include "SkCanvas.h"
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#include "SkGradientShader.h"
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#include "SkPoint.h"
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#include "SkShader.h"
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#include "SkTextBlob.h"
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#include "SkTDArray.h"
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#include "SkTypeface.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(const char* txt) {
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SkPaint p;
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size_t txtLen = strlen(txt);
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fGlyphs.append(p.textToGlyphs(txt, txtLen, NULL));
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p.textToGlyphs(txt, txtLen, fGlyphs.begin());
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}
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protected:
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virtual void onOnceBeforeDraw() SK_OVERRIDE {
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SkPaint p;
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p.setAntiAlias(true);
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p.setSubpixelText(true);
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p.setTextSize(30);
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p.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
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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(p, glyphCount, 10, 10, NULL);
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memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
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run = &builder.allocRunPosH(p, glyphCount, 80, NULL);
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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] = p.getTextSize() * i * .75f;
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}
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run = &builder.allocRunPos(p, glyphCount, NULL);
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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] = p.getTextSize() * 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.reset(builder.build());
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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.reset(SkGradientShader::CreateRadial(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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SkShader::kRepeat_TileMode));
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}
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virtual uint32_t onGetFlags() const SK_OVERRIDE {
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return kSkip565_Flag;
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}
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virtual SkString onShortName() SK_OVERRIDE {
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return SkString("textblobshader");
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}
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virtual SkISize onISize() SK_OVERRIDE {
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return SkISize::Make(640, 480);
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}
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virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
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SkPaint p;
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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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static const int kXCount = 4;
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static const 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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private:
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SkTDArray<uint16_t> fGlyphs;
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SkAutoTUnref<const SkTextBlob> fBlob;
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SkAutoTUnref<SkShader> fShader;
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typedef skiagm::GM INHERITED;
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};
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DEF_GM( return SkNEW_ARGS(TextBlobShaderGM, ("Blobber")); )
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