senorblanco@chromium.org | 4a9a612 | 2012-12-04 14:18:50 +0000 | [diff] [blame] | 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 "SkMergeImageFilter.h" |
| 9 | #include "SkCanvas.h" |
| 10 | #include "SkDevice.h" |
| 11 | #include "SkFlattenableBuffers.h" |
| 12 | |
| 13 | /////////////////////////////////////////////////////////////////////////////// |
| 14 | |
| 15 | void SkMergeImageFilter::initAllocModes() { |
| 16 | int inputCount = countInputs(); |
| 17 | if (inputCount) { |
| 18 | size_t size = sizeof(uint8_t) * inputCount; |
| 19 | if (size <= sizeof(fStorage)) { |
| 20 | fModes = SkTCast<uint8_t*>(fStorage); |
| 21 | } else { |
| 22 | fModes = SkTCast<uint8_t*>(sk_malloc_throw(size)); |
| 23 | } |
| 24 | } else { |
| 25 | fModes = NULL; |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | void SkMergeImageFilter::initModes(const SkXfermode::Mode modes[]) { |
| 30 | if (modes) { |
| 31 | this->initAllocModes(); |
| 32 | int inputCount = countInputs(); |
| 33 | for (int i = 0; i < inputCount; ++i) { |
| 34 | fModes[i] = SkToU8(modes[i]); |
| 35 | } |
| 36 | } else { |
| 37 | fModes = NULL; |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | SkMergeImageFilter::SkMergeImageFilter(SkImageFilter* first, SkImageFilter* second, |
| 42 | SkXfermode::Mode mode) : INHERITED(first, second) { |
| 43 | if (SkXfermode::kSrcOver_Mode != mode) { |
| 44 | SkXfermode::Mode modes[] = { mode, mode }; |
| 45 | this->initModes(modes); |
| 46 | } else { |
| 47 | fModes = NULL; |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | SkMergeImageFilter::SkMergeImageFilter(SkImageFilter* filters[], int count, |
| 52 | const SkXfermode::Mode modes[]) : INHERITED(count, filters) { |
| 53 | this->initModes(modes); |
| 54 | } |
| 55 | |
| 56 | SkMergeImageFilter::~SkMergeImageFilter() { |
| 57 | |
| 58 | if (fModes != SkTCast<uint8_t*>(fStorage)) { |
| 59 | sk_free(fModes); |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | bool SkMergeImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm, |
| 64 | SkIRect* dst) { |
| 65 | if (countInputs() < 1) { |
| 66 | return false; |
| 67 | } |
| 68 | |
| 69 | SkIRect totalBounds; |
| 70 | |
| 71 | int inputCount = countInputs(); |
| 72 | for (int i = 0; i < inputCount; ++i) { |
| 73 | SkImageFilter* filter = getInput(i); |
| 74 | SkIRect r; |
| 75 | if (filter) { |
| 76 | if (!filter->filterBounds(src, ctm, &r)) { |
| 77 | return false; |
| 78 | } |
| 79 | } else { |
| 80 | r = src; |
| 81 | } |
| 82 | if (0 == i) { |
| 83 | totalBounds = r; |
| 84 | } else { |
| 85 | totalBounds.join(r); |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | // don't modify dst until now, so we don't accidentally change it in the |
| 90 | // loop, but then return false on the next filter. |
| 91 | *dst = totalBounds; |
| 92 | return true; |
| 93 | } |
| 94 | |
| 95 | bool SkMergeImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, |
| 96 | const SkMatrix& ctm, |
| 97 | SkBitmap* result, SkIPoint* loc) { |
| 98 | if (countInputs() < 1) { |
| 99 | return false; |
| 100 | } |
| 101 | |
| 102 | const SkIRect srcBounds = SkIRect::MakeXYWH(loc->x(), loc->y(), |
| 103 | src.width(), src.height()); |
| 104 | SkIRect bounds; |
| 105 | if (!this->filterBounds(srcBounds, ctm, &bounds)) { |
| 106 | return false; |
| 107 | } |
| 108 | |
| 109 | const int x0 = bounds.left(); |
| 110 | const int y0 = bounds.top(); |
| 111 | |
robertphillips@google.com | 9b051a3 | 2013-08-20 20:06:40 +0000 | [diff] [blame^] | 112 | SkAutoTUnref<SkDevice> dst(proxy->createDevice(bounds.width(), bounds.height())); |
senorblanco@chromium.org | 4a9a612 | 2012-12-04 14:18:50 +0000 | [diff] [blame] | 113 | if (NULL == dst) { |
| 114 | return false; |
| 115 | } |
| 116 | SkCanvas canvas(dst); |
| 117 | SkPaint paint; |
| 118 | |
| 119 | int inputCount = countInputs(); |
| 120 | for (int i = 0; i < inputCount; ++i) { |
| 121 | SkBitmap tmp; |
| 122 | const SkBitmap* srcPtr; |
| 123 | SkIPoint pos = *loc; |
| 124 | SkImageFilter* filter = getInput(i); |
| 125 | if (filter) { |
| 126 | if (!filter->filterImage(proxy, src, ctm, &tmp, &pos)) { |
| 127 | return false; |
| 128 | } |
| 129 | srcPtr = &tmp; |
| 130 | } else { |
| 131 | srcPtr = &src; |
| 132 | } |
| 133 | |
| 134 | if (fModes) { |
| 135 | paint.setXfermodeMode((SkXfermode::Mode)fModes[i]); |
| 136 | } else { |
| 137 | paint.setXfermode(NULL); |
| 138 | } |
| 139 | canvas.drawSprite(*srcPtr, pos.x() - x0, pos.y() - y0, &paint); |
| 140 | } |
| 141 | |
| 142 | loc->set(bounds.left(), bounds.top()); |
| 143 | *result = dst->accessBitmap(false); |
| 144 | return true; |
| 145 | } |
| 146 | |
| 147 | void SkMergeImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { |
| 148 | this->INHERITED::flatten(buffer); |
| 149 | |
| 150 | buffer.writeBool(fModes != NULL); |
| 151 | if (fModes) { |
| 152 | buffer.writeByteArray(fModes, countInputs() * sizeof(fModes[0])); |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | SkMergeImageFilter::SkMergeImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) { |
| 157 | bool hasModes = buffer.readBool(); |
| 158 | if (hasModes) { |
| 159 | this->initAllocModes(); |
| 160 | SkASSERT(buffer.getArrayCount() == countInputs() * sizeof(fModes[0])); |
| 161 | buffer.readByteArray(fModes); |
| 162 | } else { |
| 163 | fModes = 0; |
| 164 | } |
| 165 | } |