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 s ? SkNEW_ARGS(SkRectShaderImageFilter, (s, &cropRect)) : NULL;
24}
25
26SkRectShaderImageFilter* SkRectShaderImageFilter::Create(SkShader* s, const CropRect* cropRect) {
27    SkASSERT(s);
28    return s ? SkNEW_ARGS(SkRectShaderImageFilter, (s, cropRect)) : NULL;
29}
30
31SkRectShaderImageFilter::SkRectShaderImageFilter(SkShader* s, const CropRect* cropRect)
32  : INHERITED(0, NULL, cropRect)
33  , fShader(SkRef(s)) {
34}
35
36SkFlattenable* SkRectShaderImageFilter::CreateProc(SkReadBuffer& buffer) {
37    SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 0);
38    SkAutoTUnref<SkShader> shader(buffer.readShader());
39    return Create(shader.get(), &common.cropRect());
40}
41
42void SkRectShaderImageFilter::flatten(SkWriteBuffer& buffer) const {
43    this->INHERITED::flatten(buffer);
44    buffer.writeFlattenable(fShader);
45}
46
47SkRectShaderImageFilter::~SkRectShaderImageFilter() {
48    fShader->unref();
49}
50
51bool SkRectShaderImageFilter::onFilterImage(Proxy* proxy,
52                                            const SkBitmap& source,
53                                            const Context& ctx,
54                                            SkBitmap* result,
55                                            SkIPoint* offset) const {
56    SkIRect bounds;
57    if (!this->applyCropRect(ctx, source, SkIPoint::Make(0, 0), &bounds)) {
58        return false;
59    }
60
61    SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(),
62                                                          bounds.height()));
63    if (NULL == device.get()) {
64        return false;
65    }
66    SkCanvas canvas(device.get());
67
68    SkPaint paint;
69    SkMatrix matrix(ctx.ctm());
70    matrix.postTranslate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top()));
71    SkSafeUnref(paint.setShader(SkShader::CreateLocalMatrixShader(fShader, matrix)));
72
73    SkRect rect = SkRect::MakeWH(SkIntToScalar(bounds.width()), SkIntToScalar(bounds.height()));
74    canvas.drawRect(rect, paint);
75
76    *result = device.get()->accessBitmap(false);
77    offset->fX = bounds.fLeft;
78    offset->fY = bounds.fTop;
79    return true;
80}
81
82#ifndef SK_IGNORE_TO_STRING
83void SkRectShaderImageFilter::toString(SkString* str) const {
84    str->appendf("SkRectShaderImageFilter: (");
85    str->append(")");
86}
87#endif
88