/*
* 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 "sk_tool_utils.h"
#include "SkCanvasPriv.h"
#include "SkPath.h"
#include "SkMakeUnique.h"
static void do_draw(SkCanvas* canvas, const SkRect& r) {
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
paint.setColor(0x800000FF);
canvas->drawRect(r, paint);
}
/**
* Exercise SkCanvasPriv::kDontClipToLayer_SaveLayerFlag flag, which does not limit the clip to the
* layer's bounds. Thus when a draw occurs, it can (depending on "where" it is) draw into the layer
* and/or draw onto the surrounding portions of the canvas, or both.
*
* This GM has a 100x100 rectangle (r), which its going to draw. However first it creates a layer
* with this flag covering 1/2 of the rectangle (upper half). Then it draws the rect in SRC mode.
*
* The portion of the draw that intersects the layer should see the SRC draw, apply it to the layer
* and then during restore, it will SRC_OVER that layer onto the canvas (SRC_OVER since the layer
* has no paint, so it gets the default xfermode during restore).
*
* Note: when we talk about drawing directly into the "canvas", in fact we are drawing into an
* "outer" layer we created (filled with red). This is a testing detail, so that our final
* output image is itself opaque, otherwise we make it harder to view the GM as a PNG.
*
* The portion of the draw below the layer draws directly into the canvas. Since it is in SRC mode,
* it will write 0x80 to the canvas' alpha, overwriting the "red", which then gets blended with
* the GM's white background.
*
* The portion in the layer, will end up SRC_OVERing the 0x80 layer pixels onto the canvas' red
* pixels, making magenta.
*
* Thus the expected result is the upper half to be magenta 0xFF7F0080, and the lower half to be
* light blue 0xFF7F7FFF.
*/
DEF_SIMPLE_GM(dont_clip_to_layer, canvas, 120, 120) {
const SkRect r { 10, 10, 110, 110 };
// Wrap the entire test inside a red layer, so we don't punch the actual gm's alpha with
// kSrc_Mode, which makes it hard to view (we like our GMs to have opaque pixels).
canvas->saveLayer(&r, nullptr);
canvas->drawColor(SK_ColorRED);
SkRect r0 = { 20, 20, 100, 55 };
SkRect r1 = { 20, 65, 100, 100 };
SkCanvas::SaveLayerRec rec;
rec.fPaint = nullptr;
rec.fBounds = &r0;
rec.fBackdrop = nullptr;
rec.fSaveLayerFlags = SkCanvasPriv::kDontClipToLayer_SaveLayerFlag;
canvas->saveLayer(rec);
rec.fBounds = &r1;
canvas->saveLayer(rec);
do_draw(canvas, r);
canvas->restore();
canvas->restore();
canvas->restore(); // red-layer
}
/** Draw a 2px border around the target, then red behind the target;
set the clip to match the target, then draw >> the target in blue.
*/
static void draw(SkCanvas* canvas, SkRect& target, int x, int y) {
SkPaint borderPaint;
borderPaint.setColor(SkColorSetRGB(0x0, 0xDD, 0x0));
borderPaint.setAntiAlias(true);
SkPaint backgroundPaint;
backgroundPaint.setColor(SkColorSetRGB(0xDD, 0x0, 0x0));
backgroundPaint.setAntiAlias(true);
SkPaint foregroundPaint;
foregroundPaint.setColor(SkColorSetRGB(0x0, 0x0, 0xDD));
foregroundPaint.setAntiAlias(true);
canvas->save();
canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
target.inset(SkIntToScalar(-2), SkIntToScalar(-2));
canvas->drawRect(target, borderPaint);
target.inset(SkIntToScalar(2), SkIntToScalar(2));
canvas->drawRect(target, backgroundPaint);
canvas->clipRect(target, true);
target.inset(SkIntToScalar(-4), SkIntToScalar(-4));
canvas->drawRect(target, foregroundPaint);
canvas->restore();
}
static void draw_square(SkCanvas* canvas, int x, int y) {
SkRect target (SkRect::MakeWH(10 * SK_Scalar1, 10 * SK_Scalar1));
draw(canvas, target, x, y);
}
static void draw_column(SkCanvas* canvas, int x, int y) {
SkRect target (SkRect::MakeWH(1 * SK_Scalar1, 10 * SK_Scalar1));
draw(canvas, target, x, y);
}
static void draw_bar(SkCanvas* canvas, int x, int y) {
SkRect target (SkRect::MakeWH(10 * SK_Scalar1, 1 * SK_Scalar1));
draw(canvas, target, x, y);
}
static void draw_rect_tests(SkCanvas* canvas) {
draw_square(canvas, 10, 10);
draw_column(canvas, 30, 10);
draw_bar(canvas, 10, 30);
}
/**
Test a set of clipping problems discovered while writing blitAntiRect,
and test all the code paths through the clipping blitters.
Each region should show as a blue center surrounded by a 2px green
border, with no red.
*/
DEF_SIMPLE_GM(aaclip, canvas, 240, 120) {
// Initial pixel-boundary-aligned draw
draw_rect_tests(canvas);
// Repeat 4x with .2, .4, .6, .8 px offsets
canvas->translate(SK_Scalar1 / 5, SK_Scalar1 / 5);
canvas->translate(SkIntToScalar(50), 0);
draw_rect_tests(canvas);
canvas->translate(SK_Scalar1 / 5, SK_Scalar1 / 5);
canvas->translate(SkIntToScalar(50), 0);
draw_rect_tests(canvas);
canvas->translate(SK_Scalar1 / 5, SK_Scalar1 / 5);
canvas->translate(SkIntToScalar(50), 0);
draw_rect_tests(canvas);
canvas->translate(SK_Scalar1 / 5, SK_Scalar1 / 5);
canvas->translate(SkIntToScalar(50), 0);
draw_rect_tests(canvas);
}
/////////////////////////////////////////////////////////////////////////
#ifdef SK_BUILD_FOR_MAC
static std::unique_ptr<SkCanvas> make_canvas(const SkBitmap& bm) {
const SkImageInfo& info = bm.info();
if (info.bytesPerPixel() == 4) {
return SkCanvas::MakeRasterDirectN32(info.width(), info.height(),
(SkPMColor*)bm.getPixels(),
bm.rowBytes());
} else {
return skstd::make_unique<SkCanvas>(bm);
}
}
#include "SkCGUtils.h"
static void test_image(SkCanvas* canvas, const SkImageInfo& info) {
SkBitmap bm;
bm.allocPixels(info);
if (info.isOpaque()) {
bm.eraseColor(SK_ColorGREEN);
} else {
bm.eraseColor(0);
}
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(SK_ColorBLUE);
make_canvas(bm)->drawCircle(50, 50, 49, paint);
canvas->drawBitmap(bm, 10, 10);
CGImageRef image = SkCreateCGImageRefWithColorspace(bm, nullptr);
SkBitmap bm2;
SkCreateBitmapFromCGImage(&bm2, image);
canvas->drawBitmap(bm2, 10, 120);
canvas->drawImage(SkMakeImageFromCGImage(image), 10, 120 + bm2.height() + 10);
CGImageRelease(image);
}
DEF_SIMPLE_GM(cgimage, canvas, 800, 250) {
const struct {
SkColorType fCT;
SkAlphaType fAT;
} rec[] = {
{ kRGB_565_SkColorType, kOpaque_SkAlphaType },
{ kRGBA_8888_SkColorType, kPremul_SkAlphaType },
{ kRGBA_8888_SkColorType, kUnpremul_SkAlphaType },
{ kRGBA_8888_SkColorType, kOpaque_SkAlphaType },
{ kBGRA_8888_SkColorType, kPremul_SkAlphaType },
{ kBGRA_8888_SkColorType, kUnpremul_SkAlphaType },
{ kBGRA_8888_SkColorType, kOpaque_SkAlphaType },
};
for (size_t i = 0; i < SK_ARRAY_COUNT(rec); ++i) {
SkImageInfo info = SkImageInfo::Make(100, 100, rec[i].fCT, rec[i].fAT);
test_image(canvas, info);
canvas->translate(info.width() + 10, 0);
}
}
#endif
///////////////////////////////////////////////////////////////////////////////////////////////////
// https://bug.skia.org/3716
class ClipCubicGM : public skiagm::GM {
const SkScalar W = 100;
const SkScalar H = 240;
SkPath fVPath, fHPath;
public:
ClipCubicGM() {
fVPath.moveTo(W, 0);
fVPath.cubicTo(W, H-10, 0, 10, 0, H);
SkMatrix pivot;
pivot.setRotate(90, W/2, H/2);
fVPath.transform(pivot, &fHPath);
}
protected:
SkString onShortName() override {
return SkString("clipcubic");
}
SkISize onISize() override {
return SkISize::Make(400, 410);
}
void doDraw(SkCanvas* canvas, const SkPath& path) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(0xFFCCCCCC);
canvas->drawPath(path, paint);
paint.setColor(SK_ColorRED);
paint.setStyle(SkPaint::kStroke_Style);
canvas->drawPath(path, paint);
}
void drawAndClip(SkCanvas* canvas, const SkPath& path, SkScalar dx, SkScalar dy) {
SkAutoCanvasRestore acr(canvas, true);
SkRect r = SkRect::MakeXYWH(0, H/4, W, H/2);
SkPaint paint;
paint.setColor(sk_tool_utils::color_to_565(0xFF8888FF));
canvas->drawRect(r, paint);
this->doDraw(canvas, path);
canvas->translate(dx, dy);
canvas->drawRect(r, paint);
canvas->clipRect(r);
this->doDraw(canvas, path);
}
void onDraw(SkCanvas* canvas) override {
canvas->translate(80, 10);
this->drawAndClip(canvas, fVPath, 200, 0);
canvas->translate(0, 200);
this->drawAndClip(canvas, fHPath, 200, 0);
}
private:
typedef skiagm::GM INHERITED;
};
DEF_GM(return new ClipCubicGM;)