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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
* Tests text rendering with LCD and the various blend modes.
*/
#include "gm.h"
#include "sk_tool_utils.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkSurface.h"
namespace skiagm {
constexpr int kColWidth = 180;
constexpr int kNumCols = 4;
constexpr int kWidth = kColWidth * kNumCols;
constexpr int kHeight = 750;
static sk_sp<SkShader> make_shader(const SkRect& bounds) {
const SkPoint pts[] = {
{ bounds.left(), bounds.top() },
{ bounds.right(), bounds.bottom() },
};
const SkColor colors[] = {
SK_ColorRED, SK_ColorGREEN,
};
return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
SkShader::kRepeat_TileMode);
}
class LcdBlendGM : public skiagm::GM {
public:
LcdBlendGM() {
const int kPointSize = 25;
fTextHeight = SkIntToScalar(kPointSize);
}
protected:
SkString onShortName() override {
return SkString("lcdblendmodes");
}
void onOnceBeforeDraw() override {
fCheckerboard = sk_tool_utils::create_checkerboard_shader(SK_ColorBLACK, SK_ColorWHITE, 4);
}
SkISize onISize() override { return SkISize::Make(kWidth, kHeight); }
void onDraw(SkCanvas* canvas) override {
SkPaint p;
p.setAntiAlias(false);
p.setStyle(SkPaint::kFill_Style);
p.setShader(fCheckerboard);
SkRect r = SkRect::MakeWH(SkIntToScalar(kWidth), SkIntToScalar(kHeight));
canvas->drawRect(r, p);
SkImageInfo info = SkImageInfo::MakeN32Premul(kWidth, kHeight);
auto surface(sk_tool_utils::makeSurface(canvas, info));
SkCanvas* surfCanvas = surface->getCanvas();
this->drawColumn(surfCanvas, SK_ColorBLACK, SK_ColorWHITE, false);
surfCanvas->translate(SkIntToScalar(kColWidth), 0);
this->drawColumn(surfCanvas, SK_ColorWHITE, SK_ColorBLACK, false);
surfCanvas->translate(SkIntToScalar(kColWidth), 0);
this->drawColumn(surfCanvas, SK_ColorGREEN, SK_ColorMAGENTA, false);
surfCanvas->translate(SkIntToScalar(kColWidth), 0);
this->drawColumn(surfCanvas, SK_ColorCYAN, SK_ColorMAGENTA, true);
SkPaint surfPaint;
surfPaint.setBlendMode(SkBlendMode::kSrcOver);
surface->draw(canvas, 0, 0, &surfPaint);
}
void drawColumn(SkCanvas* canvas, SkColor backgroundColor, SkColor textColor, bool useGrad) {
const SkBlendMode gModes[] = {
SkBlendMode::kClear,
SkBlendMode::kSrc,
SkBlendMode::kDst,
SkBlendMode::kSrcOver,
SkBlendMode::kDstOver,
SkBlendMode::kSrcIn,
SkBlendMode::kDstIn,
SkBlendMode::kSrcOut,
SkBlendMode::kDstOut,
SkBlendMode::kSrcATop,
SkBlendMode::kDstATop,
SkBlendMode::kXor,
SkBlendMode::kPlus,
SkBlendMode::kModulate,
SkBlendMode::kScreen,
SkBlendMode::kOverlay,
SkBlendMode::kDarken,
SkBlendMode::kLighten,
SkBlendMode::kColorDodge,
SkBlendMode::kColorBurn,
SkBlendMode::kHardLight,
SkBlendMode::kSoftLight,
SkBlendMode::kDifference,
SkBlendMode::kExclusion,
SkBlendMode::kMultiply,
SkBlendMode::kHue,
SkBlendMode::kSaturation,
SkBlendMode::kColor,
SkBlendMode::kLuminosity,
};
// Draw background rect
SkPaint backgroundPaint;
backgroundPaint.setColor(backgroundColor);
canvas->drawRect(SkRect::MakeIWH(kColWidth, kHeight), backgroundPaint);
SkScalar y = fTextHeight;
for (size_t m = 0; m < SK_ARRAY_COUNT(gModes); m++) {
SkPaint paint;
paint.setColor(textColor);
paint.setAntiAlias(true);
paint.setSubpixelText(true);
paint.setLCDRenderText(true);
paint.setTextSize(fTextHeight);
paint.setBlendMode(gModes[m]);
sk_tool_utils::set_portable_typeface(&paint);
if (useGrad) {
SkRect r;
r.setXYWH(0, y - fTextHeight, SkIntToScalar(kColWidth), fTextHeight);
paint.setShader(make_shader(r));
}
SkString string(SkBlendMode_Name(gModes[m]));
canvas->drawString(string, 0, y, paint);
y+=fTextHeight;
}
}
private:
SkScalar fTextHeight;
sk_sp<SkShader> fCheckerboard;
typedef skiagm::GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new LcdBlendGM; )
}
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