1 /*
2 * Copyright 2016 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "include/core/SkCanvas.h"
9 #include "include/core/SkPaint.h"
10 #include "include/effects/SkImageFilters.h"
11 #include "src/core/SkImageFilter_Base.h"
12 #include "src/core/SkReadBuffer.h"
13 #include "src/core/SkSpecialImage.h"
14 #include "src/core/SkSpecialSurface.h"
15 #include "src/core/SkWriteBuffer.h"
16
17 namespace {
18
19 class SkShaderImageFilter final : public SkImageFilter_Base {
20 public:
SkShaderImageFilter(const SkPaint & paint,const SkRect * rect)21 SkShaderImageFilter(const SkPaint& paint, const SkRect* rect)
22 : INHERITED(nullptr, 0, rect)
23 , fPaint(paint) {}
24
Make(const SkPaint & paint,const SkRect * rect)25 static sk_sp<SkImageFilter> Make(const SkPaint& paint, const SkRect* rect) {
26 return sk_sp<SkImageFilter>(new SkShaderImageFilter(paint, rect));
27 }
28
29 protected:
30 void flatten(SkWriteBuffer&) const override;
31 sk_sp<SkSpecialImage> onFilterImage(const Context&, SkIPoint* offset) const override;
32
33 private:
34 friend void ::SkRegisterShaderImageFilterFlattenable();
SK_FLATTENABLE_HOOKS(SkShaderImageFilter)35 SK_FLATTENABLE_HOOKS(SkShaderImageFilter)
36
37 bool onAffectsTransparentBlack() const override { return true; }
38
39 // This filter only applies the shader and dithering policy of the paint.
40 SkPaint fPaint;
41
42 using INHERITED = SkImageFilter_Base;
43 };
44
45 } // end namespace
46
47 // TODO(michaelludwig) - Remove this deprecated factory once modules/svg is updated
Paint(const SkPaint & paint,const CropRect & cropRect)48 sk_sp<SkImageFilter> SkImageFilters::Paint(const SkPaint& paint, const CropRect& cropRect) {
49 return SkShaderImageFilter::Make(paint, cropRect);
50 }
51
Shader(sk_sp<SkShader> shader,Dither dither,const CropRect & cropRect)52 sk_sp<SkImageFilter> SkImageFilters::Shader(sk_sp<SkShader> shader, Dither dither,
53 const CropRect& cropRect) {
54 SkPaint paint;
55 paint.setShader(std::move(shader));
56 paint.setDither((bool) dither);
57 return SkShaderImageFilter::Make(paint, cropRect);
58 }
59
SkRegisterShaderImageFilterFlattenable()60 void SkRegisterShaderImageFilterFlattenable() {
61 SK_REGISTER_FLATTENABLE(SkShaderImageFilter);
62 // TODO (michaelludwig) - Remove after grace period for SKPs to stop using old name
63 SkFlattenable::Register("SkPaintImageFilter", SkShaderImageFilter::CreateProc);
64 SkFlattenable::Register("SkPaintImageFilterImpl", SkShaderImageFilter::CreateProc);
65 }
66
CreateProc(SkReadBuffer & buffer)67 sk_sp<SkFlattenable> SkShaderImageFilter::CreateProc(SkReadBuffer& buffer) {
68 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 0);
69 return SkShaderImageFilter::Make(buffer.readPaint(), common.cropRect());
70 }
71
flatten(SkWriteBuffer & buffer) const72 void SkShaderImageFilter::flatten(SkWriteBuffer& buffer) const {
73 this->INHERITED::flatten(buffer);
74 buffer.writePaint(fPaint);
75 }
76
77 ///////////////////////////////////////////////////////////////////////////////////////////////////
78
onFilterImage(const Context & ctx,SkIPoint * offset) const79 sk_sp<SkSpecialImage> SkShaderImageFilter::onFilterImage(const Context& ctx,
80 SkIPoint* offset) const {
81 SkIRect bounds;
82 const SkIRect srcBounds = SkIRect::MakeWH(ctx.sourceImage()->width(),
83 ctx.sourceImage()->height());
84 if (!this->applyCropRect(ctx, srcBounds, &bounds)) {
85 return nullptr;
86 }
87
88 sk_sp<SkSpecialSurface> surf(ctx.makeSurface(bounds.size()));
89 if (!surf) {
90 return nullptr;
91 }
92
93 SkCanvas* canvas = surf->getCanvas();
94 SkASSERT(canvas);
95
96 canvas->clear(0x0);
97
98 SkMatrix matrix(ctx.ctm());
99 matrix.postTranslate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top()));
100 SkRect rect = SkRect::MakeIWH(bounds.width(), bounds.height());
101 SkMatrix inverse;
102 if (matrix.invert(&inverse)) {
103 inverse.mapRect(&rect);
104 }
105 canvas->setMatrix(matrix);
106 if (rect.isFinite()) {
107 canvas->drawRect(rect, fPaint);
108 }
109
110 offset->fX = bounds.fLeft;
111 offset->fY = bounds.fTop;
112 return surf->makeImageSnapshot();
113 }
114