1/*
2 * Copyright 2012 The Android Open Source Project
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 "SkBitmapSource.h"
9#include "SkDevice.h"
10#include "SkCanvas.h"
11#include "SkReadBuffer.h"
12#include "SkWriteBuffer.h"
13#include "SkValidationUtils.h"
14
15SkBitmapSource::SkBitmapSource(const SkBitmap& bitmap)
16  : INHERITED(0, 0)
17  , fBitmap(bitmap)
18  , fSrcRect(SkRect::MakeWH(SkIntToScalar(bitmap.width()),
19                            SkIntToScalar(bitmap.height())))
20  , fDstRect(fSrcRect)
21{}
22
23SkBitmapSource::SkBitmapSource(const SkBitmap& bitmap, const SkRect& srcRect, const SkRect& dstRect)
24  : INHERITED(0, 0)
25  , fBitmap(bitmap)
26  , fSrcRect(srcRect)
27  , fDstRect(dstRect) {}
28
29#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
30SkBitmapSource::SkBitmapSource(SkReadBuffer& buffer) : INHERITED(0, buffer) {
31    if (buffer.isVersionLT(SkReadBuffer::kNoMoreBitmapFlatten_Version)) {
32        fBitmap.legacyUnflatten(buffer);
33    } else {
34        buffer.readBitmap(&fBitmap);
35    }
36    buffer.readRect(&fSrcRect);
37    buffer.readRect(&fDstRect);
38    buffer.validate(buffer.isValid() && SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));
39}
40#endif
41
42SkFlattenable* SkBitmapSource::CreateProc(SkReadBuffer& buffer) {
43    SkRect src, dst;
44    buffer.readRect(&src);
45    buffer.readRect(&dst);
46    SkBitmap bitmap;
47    if (!buffer.readBitmap(&bitmap)) {
48        return NULL;
49    }
50    return SkBitmapSource::Create(bitmap, src, dst);
51}
52
53void SkBitmapSource::flatten(SkWriteBuffer& buffer) const {
54    buffer.writeRect(fSrcRect);
55    buffer.writeRect(fDstRect);
56    buffer.writeBitmap(fBitmap);
57}
58
59bool SkBitmapSource::onFilterImage(Proxy* proxy, const SkBitmap&, const Context& ctx,
60                                   SkBitmap* result, SkIPoint* offset) const {
61    SkRect bounds, dstRect;
62    fBitmap.getBounds(&bounds);
63    ctx.ctm().mapRect(&dstRect, fDstRect);
64    if (fSrcRect == bounds && dstRect == bounds) {
65        // No regions cropped out or resized; return entire bitmap.
66        *result = fBitmap;
67        offset->fX = offset->fY = 0;
68        return true;
69    }
70    SkIRect dstIRect;
71    dstRect.roundOut(&dstIRect);
72
73    SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(dstIRect.width(), dstIRect.height()));
74    if (NULL == device.get()) {
75        return false;
76    }
77
78    SkCanvas canvas(device.get());
79    SkPaint paint;
80
81    // Subtract off the integer component of the translation (will be applied in loc, below).
82    dstRect.offset(-SkIntToScalar(dstIRect.fLeft), -SkIntToScalar(dstIRect.fTop));
83    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
84    // FIXME: this probably shouldn't be necessary, but drawBitmapRectToRect asserts
85    // None filtering when it's translate-only
86    paint.setFilterLevel(
87        fSrcRect.width() == dstRect.width() && fSrcRect.height() == dstRect.height() ?
88        SkPaint::kNone_FilterLevel : SkPaint::kHigh_FilterLevel);
89    canvas.drawBitmapRectToRect(fBitmap, &fSrcRect, dstRect, &paint);
90
91    *result = device.get()->accessBitmap(false);
92    offset->fX = dstIRect.fLeft;
93    offset->fY = dstIRect.fTop;
94    return true;
95}
96
97void SkBitmapSource::computeFastBounds(const SkRect&, SkRect* dst) const {
98    *dst = fDstRect;
99}
100
101bool SkBitmapSource::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
102                                    SkIRect* dst) const {
103    *dst = src;
104    return true;
105}
106