1/*
2 * Copyright 2013 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 "SkRectShaderImageFilter.h"
9#include "SkBitmap.h"
10#include "SkCanvas.h"
11#include "SkDevice.h"
12#include "SkReadBuffer.h"
13#include "SkWriteBuffer.h"
14#include "SkShader.h"
15
16SkRectShaderImageFilter* SkRectShaderImageFilter::Create(SkShader* s, const SkRect& rect) {
17    SkASSERT(s);
18    uint32_t flags = CropRect::kHasAll_CropEdge;
19    if (rect.width() == 0 || rect.height() == 0) {
20        flags = 0x0;
21    }
22    CropRect cropRect(rect, flags);
23    return SkNEW_ARGS(SkRectShaderImageFilter, (s, &cropRect));
24}
25
26SkRectShaderImageFilter* SkRectShaderImageFilter::Create(SkShader* s, const CropRect* cropRect) {
27    SkASSERT(s);
28    return SkNEW_ARGS(SkRectShaderImageFilter, (s, cropRect));
29}
30
31SkRectShaderImageFilter::SkRectShaderImageFilter(SkShader* s, const CropRect* cropRect)
32  : INHERITED(NULL, cropRect)
33  , fShader(s) {
34    SkASSERT(s);
35    s->ref();
36}
37
38SkRectShaderImageFilter::SkRectShaderImageFilter(SkReadBuffer& buffer)
39  : INHERITED(1, buffer) {
40    fShader = buffer.readShader();
41}
42
43void SkRectShaderImageFilter::flatten(SkWriteBuffer& buffer) const {
44    this->INHERITED::flatten(buffer);
45
46    buffer.writeFlattenable(fShader);
47}
48
49SkRectShaderImageFilter::~SkRectShaderImageFilter() {
50    SkSafeUnref(fShader);
51}
52
53bool SkRectShaderImageFilter::onFilterImage(Proxy* proxy,
54                                            const SkBitmap& source,
55                                            const Context& ctx,
56                                            SkBitmap* result,
57                                            SkIPoint* offset) const {
58    SkIRect bounds;
59    if (!this->applyCropRect(ctx, source, SkIPoint::Make(0, 0), &bounds)) {
60        return false;
61    }
62
63    SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(),
64                                                          bounds.height()));
65    if (NULL == device.get()) {
66        return false;
67    }
68    SkCanvas canvas(device.get());
69
70    SkPaint paint;
71    SkMatrix matrix(ctx.ctm());
72    matrix.postTranslate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top()));
73    paint.setShader(SkShader::CreateLocalMatrixShader(fShader, matrix))->unref();
74
75    SkRect rect = SkRect::MakeWH(SkIntToScalar(bounds.width()), SkIntToScalar(bounds.height()));
76    canvas.drawRect(rect, paint);
77
78    *result = device.get()->accessBitmap(false);
79    offset->fX = bounds.fLeft;
80    offset->fY = bounds.fTop;
81    return true;
82}
83