100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
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/*
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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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/**
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* This test exercises drawPosTextH and drawPosText with every text align.
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*/
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static const int kWidth = 480;
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static const int kHeight = 600;
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static const SkScalar kTextHeight = 64.0f;
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static const int kMaxStringLength = 12;
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namespace skiagm {
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class GlyphPosAlignGM : public GM {
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protected:
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virtual uint32_t onGetFlags() const SK_OVERRIDE {
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return kSkipTiled_Flag;
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}
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virtual SkString onShortName() SK_OVERRIDE {
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return SkString("glyph_pos_align");
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}
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virtual SkISize onISize() { return SkISize::Make(kWidth, kHeight); }
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virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
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canvas->clear(SK_ColorBLACK);
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SkPaint paint;
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paint.setTextSize(kTextHeight);
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paint.setFakeBoldText(true);
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const SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
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const SkPoint pts[] = {{0, 0}, {kWidth, kHeight}};
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SkAutoTUnref<SkShader> grad(SkGradientShader::CreateLinear(pts, colors, NULL,
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SK_ARRAY_COUNT(colors),
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SkShader::kMirror_TileMode));
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paint.setShader(grad);
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paint.setTextAlign(SkPaint::kRight_Align);
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drawTestCase(canvas, "Right Align", kTextHeight, paint);
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paint.setTextAlign(SkPaint::kCenter_Align);
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drawTestCase(canvas, "Center Align", 4 * kTextHeight, paint);
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paint.setTextAlign(SkPaint::kLeft_Align);
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drawTestCase(canvas, "Left Align", 7 * kTextHeight, paint);
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}
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void drawTestCase(SkCanvas* canvas, const char* text, SkScalar y, const SkPaint& paint) {
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SkScalar widths[kMaxStringLength];
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SkScalar posX[kMaxStringLength];
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SkPoint pos[kMaxStringLength];
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int length = strlen(text);
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SkASSERT(length <= kMaxStringLength);
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paint.getTextWidths(text, length, widths);
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float originX;
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switch (paint.getTextAlign()) {
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case SkPaint::kRight_Align: originX = 1; break;
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case SkPaint::kCenter_Align: originX = 0.5f; break;
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case SkPaint::kLeft_Align: originX = 0; break;
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default: SkFAIL("Invalid paint origin"); return;
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}
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float x = kTextHeight;
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for (int i = 0; i < length; ++i) {
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posX[i] = x + originX * widths[i];
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pos[i].set(posX[i], i ? pos[i - 1].y() + 3 : y + kTextHeight);
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x += widths[i];
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}
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canvas->drawPosTextH(text, length, posX, y, paint);
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canvas->drawPosText(text, length, pos, paint);
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}
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private:
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typedef GM INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static GM* GlyphPosAlignFactory(void*) {
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return new GlyphPosAlignGM();
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}
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static GMRegistry reg(GlyphPosAlignFactory);
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}
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