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