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skia2/gm/xfermodes.cpp
Herb Derby c37b386886 Replace SK_ARRAY_COUNT with std::size() for skia/gm 
Note: in variedtext.cpp:66 changed static_assert to SkASSERT.

Change-Id: I853a2e5563c90c9dde5d6ba5443cc73b664b493d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/551876
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
2022-06-21 18:09:30 +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;
SkSamplingOptions sampling;
SkMatrix m;
bool restoreNeeded = false;
m.setTranslate(x, y);
canvas->drawImage(fSrcB.asImage(), x, y, sampling, &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->drawImage(fTransparent.asImage(), 0, 0, sampling, &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->drawImage(fDstB.asImage(), 0, 0, sampling, &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,
SkSamplingOptions(), m);
SkPaint labelP;
labelP.setAntiAlias(true);
SkFont font(ToolUtils::create_portable_typeface());
const int kWrap = 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 < std::size(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 % kWrap) == kWrap - 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:
using INHERITED = GM;
};
DEF_GM( return new XfermodesGM; )
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