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skia2/gm/xfermodes.cpp

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/*
* Copyright 2011 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 "SkBitmap.h"
#include "SkShader.h"
#include "SkXfermode.h"
namespace skiagm {
static void make_bitmaps(int w, int h, SkBitmap* src, SkBitmap* dst,
SkBitmap* transparent) {
src->allocN32Pixels(w, h);
src->eraseColor(SK_ColorTRANSPARENT);
SkPaint p;
p.setAntiAlias(true);
SkRect r;
SkScalar ww = SkIntToScalar(w);
SkScalar hh = SkIntToScalar(h);
{
SkCanvas c(*src);
p.setColor(0xFFFFCC44);
r.set(0, 0, ww*3/4, hh*3/4);
c.drawOval(r, p);
}
dst->allocN32Pixels(w, h);
dst->eraseColor(SK_ColorTRANSPARENT);
{
SkCanvas c(*dst);
p.setColor(0xFF66AAFF);
r.set(ww/3, hh/3, ww*19/20, hh*19/20);
c.drawRect(r, p);
}
transparent->allocN32Pixels(w, h);
transparent->eraseColor(SK_ColorTRANSPARENT);
}
static uint16_t gData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
class XfermodesGM : public GM {
enum SrcType {
//! A WxH image with a rectangle in the lower right.
kRectangleImage_SrcType = 0x01,
//! kRectangleImage_SrcType with an alpha of 34.5%.
kRectangleImageWithAlpha_SrcType = 0x02,
//! kRectnagleImageWithAlpha_SrcType scaled down by half.
kSmallRectangleImageWithAlpha_SrcType = 0x04,
//! kRectangleImage_SrcType drawn directly instead in an image.
kRectangle_SrcType = 0x08,
//! Two rectangles, first on the right half, second on the bottom half.
kQuarterClear_SrcType = 0x10,
//! kQuarterClear_SrcType in a layer.
kQuarterClearInLayer_SrcType = 0x20,
//! A W/2xH/2 transparent image.
kSmallTransparentImage_SrcType = 0x40,
//! kRectangleImage_SrcType drawn directly with a mask.
kRectangleWithMask_SrcType = 0x80,
kAll_SrcType = 0xFF, //!< All the source types.
kBasic_SrcType = 0x03, //!< Just basic source types.
};
SkBitmap fBG;
SkBitmap fSrcB, fDstB, fTransparent;
/* The srcType argument indicates what to draw for the source part. Skia
* uses the implied shape of the drawing command and these modes
* demonstrate that.
*/
void draw_mode(SkCanvas* canvas, SkXfermode* mode, SrcType srcType,
SkScalar x, SkScalar y) {
SkPaint p;
SkMatrix m;
bool restoreNeeded = false;
m.setTranslate(x, y);
canvas->drawBitmap(fSrcB, x, y, &p);
p.setXfermode(mode);
switch (srcType) {
case kSmallTransparentImage_SrcType: {
m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y);
SkAutoCanvasRestore acr(canvas, true);
canvas->concat(m);
canvas->drawBitmap(fTransparent, 0, 0, &p);
break;
}
case kQuarterClearInLayer_SrcType: {
SkRect bounds = SkRect::MakeXYWH(x, y, SkIntToScalar(W),
SkIntToScalar(H));
canvas->saveLayer(&bounds, &p);
restoreNeeded = true;
p.setXfermodeMode(SkXfermode::kSrcOver_Mode);
// Fall through.
}
case kQuarterClear_SrcType: {
SkScalar halfW = SkIntToScalar(W) / 2;
SkScalar halfH = SkIntToScalar(H) / 2;
p.setColor(0xFF66AAFF);
SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW,
SkIntToScalar(H));
canvas->drawRect(r, p);
p.setColor(0xFFAA66FF);
r = SkRect::MakeXYWH(x, y + halfH, SkIntToScalar(W), halfH);
canvas->drawRect(r, p);
break;
}
case kRectangleWithMask_SrcType: {
canvas->save();
restoreNeeded = true;
SkScalar w = SkIntToScalar(W);
SkScalar h = SkIntToScalar(H);
SkRect r = SkRect::MakeXYWH(x, y + h / 4, w, h * 23 / 60);
canvas->clipRect(r);
// Fall through.
}
case kRectangle_SrcType: {
SkScalar w = SkIntToScalar(W);
SkScalar h = SkIntToScalar(H);
SkRect r = SkRect::MakeXYWH(x + w / 3, y + h / 3,
w * 37 / 60, h * 37 / 60);
p.setColor(0xFF66AAFF);
canvas->drawRect(r, p);
break;
}
case kSmallRectangleImageWithAlpha_SrcType:
m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y);
// Fall through.
case kRectangleImageWithAlpha_SrcType:
p.setAlpha(0x88);
// Fall through.
case kRectangleImage_SrcType: {
SkAutoCanvasRestore acr(canvas, true);
canvas->concat(m);
canvas->drawBitmap(fDstB, 0, 0, &p);
break;
}
default:
break;
}
if (restoreNeeded) {
canvas->restore();
}
}
void onOnceBeforeDraw() override {
fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType,
kOpaque_SkAlphaType),
gData, 4);
make_bitmaps(W, H, &fSrcB, &fDstB, &fTransparent);
}
public:
const static int W = 64;
const static int H = 64;
XfermodesGM() {}
protected:
SkString onShortName() override {
return SkString("xfermodes");
}
SkISize onISize() override {
return SkISize::Make(1990, 640);
}
void onDraw(SkCanvas* canvas) override {
canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
const struct {
SkXfermode::Mode fMode;
const char* fLabel;
int fSourceTypeMask; // The source types to use this
// mode with. See draw_mode for
// an explanation of each type.
// PDF has to play some tricks
// to support the base modes,
// test those more extensively.
} gModes[] = {
{ SkXfermode::kClear_Mode, "Clear", kAll_SrcType },
{ SkXfermode::kSrc_Mode, "Src", kAll_SrcType },
{ SkXfermode::kDst_Mode, "Dst", kAll_SrcType },
{ SkXfermode::kSrcOver_Mode, "SrcOver", kAll_SrcType },
{ SkXfermode::kDstOver_Mode, "DstOver", kAll_SrcType },
{ SkXfermode::kSrcIn_Mode, "SrcIn", kAll_SrcType },
{ SkXfermode::kDstIn_Mode, "DstIn", kAll_SrcType },
{ SkXfermode::kSrcOut_Mode, "SrcOut", kAll_SrcType },
{ SkXfermode::kDstOut_Mode, "DstOut", kAll_SrcType },
{ SkXfermode::kSrcATop_Mode, "SrcATop", kAll_SrcType },
{ SkXfermode::kDstATop_Mode, "DstATop", kAll_SrcType },
{ SkXfermode::kXor_Mode, "Xor", kBasic_SrcType },
{ SkXfermode::kPlus_Mode, "Plus", kBasic_SrcType },
{ SkXfermode::kModulate_Mode, "Modulate", kAll_SrcType },
{ SkXfermode::kScreen_Mode, "Screen", kBasic_SrcType },
{ SkXfermode::kOverlay_Mode, "Overlay", kBasic_SrcType },
{ SkXfermode::kDarken_Mode, "Darken", kBasic_SrcType },
{ SkXfermode::kLighten_Mode, "Lighten", kBasic_SrcType },
{ SkXfermode::kColorDodge_Mode, "ColorDodge", kBasic_SrcType },
{ SkXfermode::kColorBurn_Mode, "ColorBurn", kBasic_SrcType },
{ SkXfermode::kHardLight_Mode, "HardLight", kBasic_SrcType },
{ SkXfermode::kSoftLight_Mode, "SoftLight", kBasic_SrcType },
{ SkXfermode::kDifference_Mode, "Difference", kBasic_SrcType },
{ SkXfermode::kExclusion_Mode, "Exclusion", kBasic_SrcType },
{ SkXfermode::kMultiply_Mode, "Multiply", kAll_SrcType },
{ SkXfermode::kHue_Mode, "Hue", kBasic_SrcType },
{ SkXfermode::kSaturation_Mode, "Saturation", kBasic_SrcType },
{ SkXfermode::kColor_Mode, "Color", kBasic_SrcType },
{ SkXfermode::kLuminosity_Mode, "Luminosity", kBasic_SrcType },
};
const SkScalar w = SkIntToScalar(W);
const SkScalar h = SkIntToScalar(H);
SkMatrix m;
m.setScale(SkIntToScalar(6), SkIntToScalar(6));
SkShader* s = SkShader::CreateBitmapShader(fBG,
SkShader::kRepeat_TileMode,
SkShader::kRepeat_TileMode,
&m);
SkPaint labelP;
labelP.setAntiAlias(true);
sk_tool_utils::set_portable_typeface(&labelP);
labelP.setTextAlign(SkPaint::kCenter_Align);
const int W = 5;
SkScalar x0 = 0;
SkScalar y0 = 0;
for (int sourceType = 1; sourceType & kAll_SrcType; sourceType <<= 1) {
SkScalar x = x0, y = y0;
for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
if ((gModes[i].fSourceTypeMask & sourceType) == 0) {
continue;
}
SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
SkAutoUnref aur(mode);
SkRect r;
r.set(x, y, x+w, y+h);
SkPaint p;
p.setStyle(SkPaint::kFill_Style);
p.setShader(s);
canvas->drawRect(r, p);
canvas->saveLayer(&r, NULL);
draw_mode(canvas, mode, static_cast<SrcType>(sourceType),
r.fLeft, r.fTop);
canvas->restore();
r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
p.setStyle(SkPaint::kStroke_Style);
p.setShader(NULL);
canvas->drawRect(r, p);
#if 1
canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
x + w/2, y - labelP.getTextSize()/2, labelP);
#endif
x += w + SkIntToScalar(10);
if ((i % W) == W - 1) {
x = x0;
y += h + SkIntToScalar(30);
}
}
if (y < 320) {
if (x > x0) {
y += h + SkIntToScalar(30);
}
y0 = y;
} else {
x0 += SkIntToScalar(400);
y0 = 0;
}
}
s->unref();
}
private:
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new XfermodesGM; }
static GMRegistry reg(MyFactory);
}
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