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 "SkFlattenableBuffers.h"
12#include "SkValidationUtils.h"
13
14SkBitmapSource::SkBitmapSource(const SkBitmap& bitmap)
15  : INHERITED(0, 0),
16    fBitmap(bitmap),
17    fSrcRect(SkRect::MakeWH(SkIntToScalar(bitmap.width()),
18                            SkIntToScalar(bitmap.height()))),
19    fDstRect(fSrcRect) {
20}
21
22SkBitmapSource::SkBitmapSource(const SkBitmap& bitmap, const SkRect& srcRect, const SkRect& dstRect)
23  : INHERITED(0, 0),
24    fBitmap(bitmap),
25    fSrcRect(srcRect),
26    fDstRect(dstRect) {
27}
28
29SkBitmapSource::SkBitmapSource(SkFlattenableReadBuffer& buffer)
30  : INHERITED(0, buffer) {
31    fBitmap.unflatten(buffer);
32    buffer.readRect(&fSrcRect);
33    buffer.readRect(&fDstRect);
34    buffer.validate(SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));
35}
36
37void SkBitmapSource::flatten(SkFlattenableWriteBuffer& buffer) const {
38    this->INHERITED::flatten(buffer);
39    fBitmap.flatten(buffer);
40    buffer.writeRect(fSrcRect);
41    buffer.writeRect(fDstRect);
42}
43
44bool SkBitmapSource::onFilterImage(Proxy* proxy, const SkBitmap&, const SkMatrix& matrix,
45                                   SkBitmap* result, SkIPoint* offset) {
46    SkRect bounds, dstRect;
47    fBitmap.getBounds(&bounds);
48    matrix.mapRect(&dstRect, fDstRect);
49    if (fSrcRect == bounds && dstRect == bounds) {
50        // No regions cropped out or resized; return entire bitmap.
51        *result = fBitmap;
52        return true;
53    }
54    SkIRect dstIRect;
55    dstRect.roundOut(&dstIRect);
56
57    SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(dstIRect.width(), dstIRect.height()));
58    if (NULL == device.get()) {
59        return false;
60    }
61
62    SkCanvas canvas(device.get());
63    SkPaint paint;
64
65    // Subtract off the integer component of the translation (will be applied in loc, below).
66    dstRect.offset(-SkIntToScalar(dstIRect.fLeft), -SkIntToScalar(dstIRect.fTop));
67    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
68    // FIXME: this probably shouldn't be necessary, but drawBitmapRectToRect asserts
69    // None filtering when it's translate-only
70    paint.setFilterLevel(
71        fSrcRect.width() == dstRect.width() && fSrcRect.height() == dstRect.height() ?
72        SkPaint::kNone_FilterLevel : SkPaint::kMedium_FilterLevel);
73    canvas.drawBitmapRectToRect(fBitmap, &fSrcRect, dstRect, &paint);
74
75    *result = device.get()->accessBitmap(false);
76    offset->fX += dstIRect.fLeft;
77    offset->fY += dstIRect.fTop;
78    return true;
79}
80