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skia2/gm/xfermodes.cpp
John Stiles 59e18dc6dd Combine coverage in GrAppliedClip using RunInSeries. 
This lets us end up with a single coverage processor instead of an array
of them. Coverage processors simply multiply against their input so the
results are conceptually equivalent.

In practice, it is uncommon to have more than one applied clip (at least
on GMs).

Change-Id: I73d5da8015f48c6cb1d3f37257e7e0c4329579b5
Bug: skia:10217
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/305117
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
2020-07-22 22:50:52 +00:00

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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/gm.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkFont.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/utils/SkTextUtils.h"
#include "tools/ToolUtils.h"
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.
};
const struct {
SkBlendMode fMode;
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[] = {
{ SkBlendMode::kClear, kAll_SrcType },
{ SkBlendMode::kSrc, kAll_SrcType },
{ SkBlendMode::kDst, kAll_SrcType },
{ SkBlendMode::kSrcOver, kAll_SrcType },
{ SkBlendMode::kDstOver, kAll_SrcType },
{ SkBlendMode::kSrcIn, kAll_SrcType },
{ SkBlendMode::kDstIn, kAll_SrcType },
{ SkBlendMode::kSrcOut, kAll_SrcType },
{ SkBlendMode::kDstOut, kAll_SrcType },
{ SkBlendMode::kSrcATop, kAll_SrcType },
{ SkBlendMode::kDstATop, kAll_SrcType },
{ SkBlendMode::kXor, kBasic_SrcType },
{ SkBlendMode::kPlus, kBasic_SrcType },
{ SkBlendMode::kModulate, kAll_SrcType },
{ SkBlendMode::kScreen, kBasic_SrcType },
{ SkBlendMode::kOverlay, kBasic_SrcType },
{ SkBlendMode::kDarken, kBasic_SrcType },
{ SkBlendMode::kLighten, kBasic_SrcType },
{ SkBlendMode::kColorDodge, kBasic_SrcType },
{ SkBlendMode::kColorBurn, kBasic_SrcType },
{ SkBlendMode::kHardLight, kBasic_SrcType },
{ SkBlendMode::kSoftLight, kBasic_SrcType },
{ SkBlendMode::kDifference, kBasic_SrcType },
{ SkBlendMode::kExclusion, kBasic_SrcType },
{ SkBlendMode::kMultiply, kAll_SrcType },
{ SkBlendMode::kHue, kBasic_SrcType },
{ SkBlendMode::kSaturation, kBasic_SrcType },
{ SkBlendMode::kColor, kBasic_SrcType },
{ SkBlendMode::kLuminosity, kBasic_SrcType },
};
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(ToolUtils::color_to_565(0xFFFFCC44));
r.setWH(ww*3/4, hh*3/4);
c.drawOval(r, p);
}
dst->allocN32Pixels(w, h);
dst->eraseColor(SK_ColorTRANSPARENT);
{
SkCanvas c(*dst);
p.setColor(ToolUtils::color_to_565(0xFF66AAFF));
r.setLTRB(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 skiagm::GM {
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, SkBlendMode 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.setBlendMode(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.setBlendMode(SkBlendMode::kSrcOver);
[[fallthrough]];
}
case kQuarterClear_SrcType: {
SkScalar halfW = SkIntToScalar(W) / 2;
SkScalar halfH = SkIntToScalar(H) / 2;
p.setColor(ToolUtils::color_to_565(0xFF66AAFF));
SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW,
SkIntToScalar(H));
canvas->drawRect(r, p);
p.setColor(ToolUtils::color_to_565(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);
[[fallthrough]];
}
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(ToolUtils::color_to_565(0xFF66AAFF));
canvas->drawRect(r, p);
break;
}
case kSmallRectangleImageWithAlpha_SrcType:
m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y);
[[fallthrough]];
case kRectangleImageWithAlpha_SrcType:
p.setAlpha(0x88);
[[fallthrough]];
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, 570);
}
void onDraw(SkCanvas* canvas) override {
canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
const SkScalar w = SkIntToScalar(W);
const SkScalar h = SkIntToScalar(H);
SkMatrix m;
m.setScale(SkIntToScalar(6), SkIntToScalar(6));
auto s = fBG.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, &m);
SkPaint labelP;
labelP.setAntiAlias(true);
SkFont font(ToolUtils::create_portable_typeface());
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;
}
SkRect r{ x, y, x+w, y+h };
SkPaint p;
p.setStyle(SkPaint::kFill_Style);
p.setShader(s);
canvas->drawRect(r, p);
canvas->saveLayer(&r, nullptr);
draw_mode(canvas, gModes[i].fMode, static_cast<SrcType>(sourceType),
r.fLeft, r.fTop);
canvas->restore();
r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
p.setStyle(SkPaint::kStroke_Style);
p.setShader(nullptr);
canvas->drawRect(r, p);
#if 1
const char* label = SkBlendMode_Name(gModes[i].fMode);
SkTextUtils::DrawString(canvas, label, x + w/2, y - font.getSize()/2,
font, labelP, SkTextUtils::kCenter_Align);
#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;
}
}
}
private:
typedef GM INHERITED;
};
DEF_GM( return new XfermodesGM; )
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