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skia2/gm/complexclip.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/SkCanvas.h"
#include "include/core/SkClipOp.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkFont.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPathBuilder.h"
#include "include/core/SkRRect.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkGradientShader.h"
#include "tools/Resources.h"
#include "tools/ToolUtils.h"
#include <string.h>
namespace skiagm {
constexpr SkColor gPathColor = SK_ColorBLACK;
constexpr SkColor gClipAColor = SK_ColorBLUE;
constexpr SkColor gClipBColor = SK_ColorRED;
class ComplexClipGM : public GM {
public:
ComplexClipGM(bool aaclip, bool saveLayer, bool invertDraw)
: fDoAAClip(aaclip)
, fDoSaveLayer(saveLayer)
, fInvertDraw(invertDraw) {
this->setBGColor(0xFFDEDFDE);
}
protected:
SkString onShortName() override {
SkString str;
str.printf("complexclip_%s%s%s",
fDoAAClip ? "aa" : "bw",
fDoSaveLayer ? "_layer" : "",
fInvertDraw ? "_invert" : "");
return str;
}
SkISize onISize() override { return SkISize::Make(388, 780); }
void onDraw(SkCanvas* canvas) override {
SkPath path = SkPathBuilder()
.moveTo(0, 50)
.quadTo(0, 0, 50, 0)
.lineTo(175, 0)
.quadTo(200, 0, 200, 25)
.lineTo(200, 150)
.quadTo(200, 200, 150, 200)
.lineTo(0, 200)
.close()
.moveTo(50, 50)
.lineTo(150, 50)
.lineTo(150, 125)
.quadTo(150, 150, 125, 150)
.lineTo(50, 150)
.close()
.detach();
if (fInvertDraw) {
path.setFillType(SkPathFillType::kInverseEvenOdd);
} else {
path.setFillType(SkPathFillType::kEvenOdd);
}
SkPaint pathPaint;
pathPaint.setAntiAlias(true);
pathPaint.setColor(gPathColor);
SkPath clipA = SkPath::Polygon({{10, 20}, {165, 22}, {70, 105}, {165, 177}, {-5, 180}}, true);
SkPath clipB = SkPath::Polygon({{40, 10}, {190, 15}, {195, 190}, {40, 185}, {155, 100}}, true);
SkFont font(ToolUtils::create_portable_typeface(), 20);
constexpr struct {
SkClipOp fOp;
const char* fName;
} gOps[] = { //extra spaces in names for measureText
{SkClipOp::kIntersect, "Isect "},
{SkClipOp::kDifference, "Diff " },
};
canvas->translate(20, 20);
canvas->scale(3 * SK_Scalar1 / 4, 3 * SK_Scalar1 / 4);
if (fDoSaveLayer) {
// We want the layer to appear symmetric relative to actual
// device boundaries so we need to "undo" the effect of the
// scale and translate
SkRect bounds = SkRect::MakeLTRB(
4.0f/3.0f * -20,
4.0f/3.0f * -20,
4.0f/3.0f * (this->getISize().fWidth - 20),
4.0f/3.0f * (this->getISize().fHeight - 20));
bounds.inset(100, 100);
SkPaint boundPaint;
boundPaint.setColor(SK_ColorRED);
boundPaint.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(bounds, boundPaint);
canvas->clipRect(bounds);
canvas->saveLayer(&bounds, nullptr);
}
for (int invBits = 0; invBits < 4; ++invBits) {
canvas->save();
for (size_t op = 0; op < std::size(gOps); ++op) {
this->drawHairlines(canvas, path, clipA, clipB);
bool doInvA = SkToBool(invBits & 1);
bool doInvB = SkToBool(invBits & 2);
canvas->save();
// set clip
clipA.setFillType(doInvA ? SkPathFillType::kInverseEvenOdd :
SkPathFillType::kEvenOdd);
clipB.setFillType(doInvB ? SkPathFillType::kInverseEvenOdd :
SkPathFillType::kEvenOdd);
canvas->clipPath(clipA, fDoAAClip);
canvas->clipPath(clipB, gOps[op].fOp, fDoAAClip);
// In the inverse case we need to prevent the draw from covering the whole
// canvas.
if (fInvertDraw) {
SkRect rectClip = clipA.getBounds();
rectClip.join(path.getBounds());
rectClip.join(path.getBounds());
rectClip.outset(5, 5);
canvas->clipRect(rectClip);
}
// draw path clipped
canvas->drawPath(path, pathPaint);
canvas->restore();
SkPaint paint;
SkScalar txtX = 45;
paint.setColor(gClipAColor);
const char* aTxt = doInvA ? "InvA " : "A ";
canvas->drawSimpleText(aTxt, strlen(aTxt), SkTextEncoding::kUTF8, txtX, 220, font, paint);
txtX += font.measureText(aTxt, strlen(aTxt), SkTextEncoding::kUTF8);
paint.setColor(SK_ColorBLACK);
canvas->drawSimpleText(gOps[op].fName, strlen(gOps[op].fName), SkTextEncoding::kUTF8, txtX, 220,
font, paint);
txtX += font.measureText(gOps[op].fName, strlen(gOps[op].fName), SkTextEncoding::kUTF8);
paint.setColor(gClipBColor);
const char* bTxt = doInvB ? "InvB " : "B ";
canvas->drawSimpleText(bTxt, strlen(bTxt), SkTextEncoding::kUTF8, txtX, 220, font, paint);
canvas->translate(250,0);
}
canvas->restore();
canvas->translate(0, 250);
}
if (fDoSaveLayer) {
canvas->restore();
}
}
private:
void drawHairlines(SkCanvas* canvas, const SkPath& path,
const SkPath& clipA, const SkPath& clipB) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
const SkAlpha fade = 0x33;
// draw path in hairline
paint.setColor(gPathColor); paint.setAlpha(fade);
canvas->drawPath(path, paint);
// draw clips in hair line
paint.setColor(gClipAColor); paint.setAlpha(fade);
canvas->drawPath(clipA, paint);
paint.setColor(gClipBColor); paint.setAlpha(fade);
canvas->drawPath(clipB, paint);
}
bool fDoAAClip;
bool fDoSaveLayer;
bool fInvertDraw;
using INHERITED = GM;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new ComplexClipGM(false, false, false);)
DEF_GM(return new ComplexClipGM(false, false, true);)
DEF_GM(return new ComplexClipGM(false, true, false);)
DEF_GM(return new ComplexClipGM(false, true, true);)
DEF_GM(return new ComplexClipGM(true, false, false);)
DEF_GM(return new ComplexClipGM(true, false, true);)
DEF_GM(return new ComplexClipGM(true, true, false);)
DEF_GM(return new ComplexClipGM(true, true, true);)
} // namespace skiagm
DEF_SIMPLE_GM(clip_shader, canvas, 840, 650) {
auto img = GetResourceAsImage("images/yellow_rose.png");
auto sh = img->makeShader(SkSamplingOptions());
SkRect r = SkRect::MakeIWH(img->width(), img->height());
SkPaint p;
canvas->translate(10, 10);
canvas->drawImage(img, 0, 0);
canvas->save();
canvas->translate(img->width() + 10, 0);
canvas->clipShader(sh, SkClipOp::kIntersect);
p.setColor(SK_ColorRED);
canvas->drawRect(r, p);
canvas->restore();
canvas->save();
canvas->translate(0, img->height() + 10);
canvas->clipShader(sh, SkClipOp::kDifference);
p.setColor(SK_ColorGREEN);
canvas->drawRect(r, p);
canvas->restore();
canvas->save();
canvas->translate(img->width() + 10, img->height() + 10);
canvas->clipShader(sh, SkClipOp::kIntersect);
canvas->save();
SkMatrix lm = SkMatrix::Scale(1.0f/5, 1.0f/5);
canvas->clipShader(img->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
SkSamplingOptions(), lm));
canvas->drawImage(img, 0, 0);
canvas->restore();
canvas->restore();
}
DEF_SIMPLE_GM(clip_shader_layer, canvas, 430, 320) {
auto img = GetResourceAsImage("images/yellow_rose.png");
auto sh = img->makeShader(SkSamplingOptions());
SkRect r = SkRect::MakeIWH(img->width(), img->height());
canvas->translate(10, 10);
// now add the cool clip
canvas->clipRect(r);
canvas->clipShader(sh);
// now draw a layer with the same image, and watch it get restored w/ the clip
canvas->saveLayer(&r, nullptr);
canvas->drawColor(0xFFFF0000);
canvas->restore();
}
DEF_SIMPLE_GM(clip_shader_nested, canvas, 256, 256) {
float w = 64.f;
float h = 64.f;
const SkColor gradColors[] = {SK_ColorBLACK, SkColorSetARGB(128, 128, 128, 128)};
auto s = SkGradientShader::MakeRadial({0.5f * w, 0.5f * h}, 0.1f * w, gradColors, nullptr,
2, SkTileMode::kRepeat, 0, nullptr);
SkPaint p;
// A large black rect affected by two gradient clips
canvas->save();
canvas->clipShader(s);
canvas->scale(2.f, 2.f);
canvas->clipShader(s);
canvas->drawRect(SkRect::MakeWH(w, h), p);
canvas->restore();
canvas->translate(0.f, 2.f * h);
// A small red rect, with no clipping
canvas->save();
p.setColor(SK_ColorRED);
canvas->drawRect(SkRect::MakeWH(w, h), p);
canvas->restore();
}
namespace {
// Where is canvas->concat(persp) called relative to the clipShader calls.
enum ConcatPerspective {
kConcatBeforeClips,
kConcatAfterClips,
kConcatBetweenClips
};
// Order in which clipShader(image) and clipShader(gradient) are specified; only meaningful
// when CanvasPerspective is kConcatBetweenClips.
enum ClipOrder {
kClipImageFirst,
kClipGradientFirst,
kDoesntMatter = kClipImageFirst
};
// Which shaders have perspective applied as a local matrix.
enum LocalMatrix {
kNoLocalMat,
kImageWithLocalMat,
kGradientWithLocalMat,
kBothWithLocalMat
};
struct Config {
ConcatPerspective fConcat;
ClipOrder fOrder;
LocalMatrix fLM;
};
static void draw_banner(SkCanvas* canvas, Config config) {
SkString banner;
banner.append("Persp: ");
if (config.fConcat == kConcatBeforeClips || config.fLM == kBothWithLocalMat) {
banner.append("Both Clips");
} else {
SkASSERT((config.fConcat == kConcatBetweenClips && config.fLM == kNoLocalMat) ||
(config.fConcat == kConcatAfterClips && (config.fLM == kImageWithLocalMat ||
config.fLM == kGradientWithLocalMat)));
if ((config.fConcat == kConcatBetweenClips && config.fOrder == kClipImageFirst) ||
config.fLM == kGradientWithLocalMat) {
banner.append("Gradient");
} else {
SkASSERT(config.fOrder == kClipGradientFirst || config.fLM == kImageWithLocalMat);
banner.append("Image");
}
}
if (config.fLM != kNoLocalMat) {
banner.append(" (w/ LM, should equal top row)");
}
static const SkFont kFont(ToolUtils::create_portable_typeface(), 12);
canvas->drawString(banner.c_str(), 20.f, -30.f, kFont, SkPaint());
};
} // namespace
DEF_SIMPLE_GM(clip_shader_persp, canvas, 1370, 1030) {
// Each draw has a clipShader(image-shader), a clipShader(gradient-shader), a concat(persp-mat),
// and each shader may or may not be wrapped with a perspective local matrix.
// Pairs of configs that should match in appearance where first config doesn't use a local
// matrix (top row of GM) and the second does (bottom row of GM).
Config matches[][2] = {
// Everything has perspective
{{kConcatBeforeClips, kDoesntMatter, kNoLocalMat},
{kConcatAfterClips, kDoesntMatter, kBothWithLocalMat}},
// Image shader has perspective
{{kConcatBetweenClips, kClipGradientFirst, kNoLocalMat},
{kConcatAfterClips, kDoesntMatter, kImageWithLocalMat}},
// Gradient shader has perspective
{{kConcatBetweenClips, kClipImageFirst, kNoLocalMat},
{kConcatAfterClips, kDoesntMatter, kGradientWithLocalMat}}
};
// The image that is drawn
auto img = GetResourceAsImage("images/yellow_rose.png");
// Scale factor always applied to the image shader so that it tiles
SkMatrix scale = SkMatrix::Scale(1.f / 4.f, 1.f / 4.f);
// The perspective matrix applied wherever needed
SkPoint src[4];
SkRect::Make(img->dimensions()).toQuad(src);
SkPoint dst[4] = {{0, 80.f},
{img->width() + 28.f, -100.f},
{img->width() - 28.f, img->height() + 100.f},
{0.f, img->height() - 80.f}};
SkMatrix persp;
SkAssertResult(persp.setPolyToPoly(src, dst, 4));
SkMatrix perspScale = SkMatrix::Concat(persp, scale);
auto drawConfig = [&](Config config) {
canvas->save();
draw_banner(canvas, config);
// Make clipShaders (possibly with local matrices)
bool gradLM = config.fLM == kGradientWithLocalMat || config.fLM == kBothWithLocalMat;
const SkColor gradColors[] = {SK_ColorBLACK, SkColorSetARGB(128, 128, 128, 128)};
auto gradShader = SkGradientShader::MakeRadial({0.5f * img->width(), 0.5f * img->height()},
0.1f * img->width(), gradColors, nullptr, 2,
SkTileMode::kRepeat, 0,
gradLM ? &persp : nullptr);
bool imageLM = config.fLM == kImageWithLocalMat || config.fLM == kBothWithLocalMat;
auto imgShader = img->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
SkSamplingOptions(), imageLM ? perspScale : scale);
// Perspective before any clipShader
if (config.fConcat == kConcatBeforeClips) {
canvas->concat(persp);
}
// First clipshader
canvas->clipShader(config.fOrder == kClipImageFirst ? imgShader : gradShader);
// Perspective between clipShader
if (config.fConcat == kConcatBetweenClips) {
canvas->concat(persp);
}
// Second clipShader
canvas->clipShader(config.fOrder == kClipImageFirst ? gradShader : imgShader);
// Perspective after clipShader
if (config.fConcat == kConcatAfterClips) {
canvas->concat(persp);
}
// Actual draw and clip boundary are the same for all configs
canvas->clipIRect(img->bounds());
canvas->clear(SK_ColorBLACK);
canvas->drawImage(img, 0, 0);
canvas->restore();
};
SkIRect grid = persp.mapRect(SkRect::Make(img->dimensions())).roundOut();
grid.fLeft -= 20; // manual adjust to look nicer
canvas->translate(10.f, 10.f);
for (size_t i = 0; i < std::size(matches); ++i) {
canvas->save();
canvas->translate(-grid.fLeft, -grid.fTop);
drawConfig(matches[i][0]);
canvas->translate(0.f, grid.height());
drawConfig(matches[i][1]);
canvas->restore();
canvas->translate(grid.width(), 0.f);
}
}
DEF_SIMPLE_GM(clip_shader_difference, canvas, 512, 512) {
auto image = GetResourceAsImage("images/yellow_rose.png");
canvas->clear(SK_ColorGRAY);
SkRect rect = SkRect::MakeWH(256, 256);
SkMatrix local = SkMatrix::RectToRect(SkRect::MakeWH(image->width(), image->height()),
SkRect::MakeWH(64, 64));
auto shader = image->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
SkSamplingOptions(), &local);
SkPaint paint;
paint.setColor(SK_ColorRED);
paint.setAntiAlias(true);
// TL: A rectangle
{
canvas->save();
canvas->translate(0, 0);
canvas->clipShader(shader, SkClipOp::kDifference);
canvas->drawRect(rect, paint);
canvas->restore();
}
// TR: A round rectangle
{
canvas->save();
canvas->translate(256, 0);
canvas->clipShader(shader, SkClipOp::kDifference);
canvas->drawRRect(SkRRect::MakeRectXY(rect, 64.f, 64.f), paint);
canvas->restore();
}
// BL: A path
{
canvas->save();
canvas->translate(0, 256);
canvas->clipShader(shader, SkClipOp::kDifference);
SkPath path;
path.moveTo(0.f, 128.f);
path.lineTo(128.f, 256.f);
path.lineTo(256.f, 128.f);
path.lineTo(128.f, 0.f);
SkScalar d = 64.f * SK_ScalarSqrt2;
path.moveTo(128.f - d, 128.f - d);
path.lineTo(128.f - d, 128.f + d);
path.lineTo(128.f + d, 128.f + d);
path.lineTo(128.f + d, 128.f - d);
canvas->drawPath(path, paint);
canvas->restore();
}
// BR: Text
{
canvas->save();
canvas->translate(256, 256);
canvas->clipShader(shader, SkClipOp::kDifference);
for (int y = 0; y < 4; ++y) {
canvas->drawString("Hello", 32.f, y * 64.f, SkFont(nullptr, 64.f), paint);
}
canvas->restore();
}
}
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