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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 "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkSurface.h"
namespace skiagm {
static const int kColWidth = 180;
static const int kNumCols = 4;
static const int kWidth = kColWidth * kNumCols;
static const 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(canvas->makeSurface(info));
if (nullptr == surface) {
surface = SkSurface::MakeRaster(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;
SkAutoTUnref<SkXfermode> xfermode(SkXfermode::Create(SkXfermode::kSrcOver_Mode));
surfPaint.setXfermode(xfermode);
surface->draw(canvas, 0, 0, &surfPaint);
}
void drawColumn(SkCanvas* canvas, SkColor backgroundColor, SkColor textColor, bool useGrad) {
const struct {
SkXfermode::Mode fMode;
const char* fLabel;
} gModes[] = {
{ SkXfermode::kClear_Mode, "Clear" },
{ SkXfermode::kSrc_Mode, "Src" },
{ SkXfermode::kDst_Mode, "Dst" },
{ SkXfermode::kSrcOver_Mode, "SrcOver" },
{ SkXfermode::kDstOver_Mode, "DstOver" },
{ SkXfermode::kSrcIn_Mode, "SrcIn" },
{ SkXfermode::kDstIn_Mode, "DstIn" },
{ SkXfermode::kSrcOut_Mode, "SrcOut" },
{ SkXfermode::kDstOut_Mode, "DstOut" },
{ SkXfermode::kSrcATop_Mode, "SrcATop" },
{ SkXfermode::kDstATop_Mode, "DstATop" },
{ SkXfermode::kXor_Mode, "Xor" },
{ SkXfermode::kPlus_Mode, "Plus" },
{ SkXfermode::kModulate_Mode, "Modulate" },
{ SkXfermode::kScreen_Mode, "Screen" },
{ SkXfermode::kOverlay_Mode, "Overlay" },
{ SkXfermode::kDarken_Mode, "Darken" },
{ SkXfermode::kLighten_Mode, "Lighten" },
{ SkXfermode::kColorDodge_Mode, "ColorDodge" },
{ SkXfermode::kColorBurn_Mode, "ColorBurn" },
{ SkXfermode::kHardLight_Mode, "HardLight" },
{ SkXfermode::kSoftLight_Mode, "SoftLight" },
{ SkXfermode::kDifference_Mode, "Difference" },
{ SkXfermode::kExclusion_Mode, "Exclusion" },
{ SkXfermode::kMultiply_Mode, "Multiply" },
{ SkXfermode::kHue_Mode, "Hue" },
{ SkXfermode::kSaturation_Mode, "Saturation" },
{ SkXfermode::kColor_Mode, "Color" },
{ SkXfermode::kLuminosity_Mode, "Luminosity" },
};
// Draw background rect
SkPaint backgroundPaint;
backgroundPaint.setColor(backgroundColor);
canvas->drawRectCoords(0, 0, SkIntToScalar(kColWidth), SkIntToScalar(kHeight),
backgroundPaint);
SkScalar y = fTextHeight;
for (size_t m = 0; m < SK_ARRAY_COUNT(gModes); m++) {
SkAutoTUnref<SkXfermode> xfermode(SkXfermode::Create(gModes[m].fMode));
SkPaint paint;
paint.setColor(textColor);
paint.setAntiAlias(true);
paint.setSubpixelText(true);
paint.setLCDRenderText(true);
paint.setTextSize(fTextHeight);
paint.setXfermode(xfermode);
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(gModes[m].fLabel);
canvas->drawText(gModes[m].fLabel, string.size(), 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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