widget/gtk/nsImageToPixbuf.cpp@b8a032363ba2 (annotated)
widget/gtk/nsImageToPixbuf.cpp
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* vim:set sw=4 sts=4 et cin: */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #include <gdk-pixbuf/gdk-pixbuf.h> |
| michael@0 | 7 | |
| michael@0 | 8 | #include "nsImageToPixbuf.h" |
| michael@0 | 9 | |
| michael@0 | 10 | #include "imgIContainer.h" |
| michael@0 | 11 | #include "mozilla/gfx/2D.h" |
| michael@0 | 12 | #include "mozilla/RefPtr.h" |
| michael@0 | 13 | #include "nsAutoPtr.h" |
| michael@0 | 14 | |
| michael@0 | 15 | using mozilla::gfx::DataSourceSurface; |
| michael@0 | 16 | using mozilla::gfx::SurfaceFormat; |
| michael@0 | 17 | using mozilla::RefPtr; |
| michael@0 | 18 | |
| michael@0 | 19 | NS_IMPL_ISUPPORTS(nsImageToPixbuf, nsIImageToPixbuf) |
| michael@0 | 20 | |
| michael@0 | 21 | inline unsigned char |
| michael@0 | 22 | unpremultiply (unsigned char color, |
| michael@0 | 23 | unsigned char alpha) |
| michael@0 | 24 | { |
| michael@0 | 25 | if (alpha == 0) |
| michael@0 | 26 | return 0; |
| michael@0 | 27 | // plus alpha/2 to round instead of truncate |
| michael@0 | 28 | return (color * 255 + alpha / 2) / alpha; |
| michael@0 | 29 | } |
| michael@0 | 30 | |
| michael@0 | 31 | NS_IMETHODIMP_(GdkPixbuf*) |
| michael@0 | 32 | nsImageToPixbuf::ConvertImageToPixbuf(imgIContainer* aImage) |
| michael@0 | 33 | { |
| michael@0 | 34 | return ImageToPixbuf(aImage); |
| michael@0 | 35 | } |
| michael@0 | 36 | |
| michael@0 | 37 | GdkPixbuf* |
| michael@0 | 38 | nsImageToPixbuf::ImageToPixbuf(imgIContainer* aImage) |
| michael@0 | 39 | { |
| michael@0 | 40 | RefPtr<SourceSurface> surface = |
| michael@0 | 41 | aImage->GetFrame(imgIContainer::FRAME_CURRENT, |
| michael@0 | 42 | imgIContainer::FLAG_SYNC_DECODE); |
| michael@0 | 43 | |
| michael@0 | 44 | // If the last call failed, it was probably because our call stack originates |
| michael@0 | 45 | // in an imgINotificationObserver event, meaning that we're not allowed request |
| michael@0 | 46 | // a sync decode. Presumably the originating event is something sensible like |
| michael@0 | 47 | // OnStopFrame(), so we can just retry the call without a sync decode. |
| michael@0 | 48 | if (!surface) |
| michael@0 | 49 | surface = aImage->GetFrame(imgIContainer::FRAME_CURRENT, |
| michael@0 | 50 | imgIContainer::FLAG_NONE); |
| michael@0 | 51 | |
| michael@0 | 52 | NS_ENSURE_TRUE(surface, nullptr); |
| michael@0 | 53 | |
| michael@0 | 54 | return SourceSurfaceToPixbuf(surface, |
| michael@0 | 55 | surface->GetSize().width, |
| michael@0 | 56 | surface->GetSize().height); |
| michael@0 | 57 | } |
| michael@0 | 58 | |
| michael@0 | 59 | GdkPixbuf* |
| michael@0 | 60 | nsImageToPixbuf::SourceSurfaceToPixbuf(SourceSurface* aSurface, |
| michael@0 | 61 | int32_t aWidth, |
| michael@0 | 62 | int32_t aHeight) |
| michael@0 | 63 | { |
| michael@0 | 64 | MOZ_ASSERT(aWidth <= aSurface->GetSize().width && |
| michael@0 | 65 | aHeight <= aSurface->GetSize().height, |
| michael@0 | 66 | "Requested rect is bigger than the supplied surface"); |
| michael@0 | 67 | |
| michael@0 | 68 | GdkPixbuf* pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, |
| michael@0 | 69 | aWidth, aHeight); |
| michael@0 | 70 | if (!pixbuf) |
| michael@0 | 71 | return nullptr; |
| michael@0 | 72 | |
| michael@0 | 73 | uint32_t destStride = gdk_pixbuf_get_rowstride (pixbuf); |
| michael@0 | 74 | guchar* destPixels = gdk_pixbuf_get_pixels (pixbuf); |
| michael@0 | 75 | |
| michael@0 | 76 | RefPtr<DataSourceSurface> dataSurface = aSurface->GetDataSurface(); |
| michael@0 | 77 | DataSourceSurface::MappedSurface map; |
| michael@0 | 78 | dataSurface->Map(DataSourceSurface::MapType::READ, &map); |
| michael@0 | 79 | uint8_t* srcData = map.mData; |
| michael@0 | 80 | int32_t srcStride = map.mStride; |
| michael@0 | 81 | |
| michael@0 | 82 | SurfaceFormat format = dataSurface->GetFormat(); |
| michael@0 | 83 | |
| michael@0 | 84 | for (int32_t row = 0; row < aHeight; ++row) { |
| michael@0 | 85 | for (int32_t col = 0; col < aWidth; ++col) { |
| michael@0 | 86 | guchar* destPixel = destPixels + row * destStride + 4 * col; |
| michael@0 | 87 | |
| michael@0 | 88 | uint32_t* srcPixel = |
| michael@0 | 89 | reinterpret_cast<uint32_t*>((srcData + row * srcStride + 4 * col)); |
| michael@0 | 90 | |
| michael@0 | 91 | if (format == SurfaceFormat::B8G8R8A8) { |
| michael@0 | 92 | const uint8_t a = (*srcPixel >> 24) & 0xFF; |
| michael@0 | 93 | const uint8_t r = unpremultiply((*srcPixel >> 16) & 0xFF, a); |
| michael@0 | 94 | const uint8_t g = unpremultiply((*srcPixel >> 8) & 0xFF, a); |
| michael@0 | 95 | const uint8_t b = unpremultiply((*srcPixel >> 0) & 0xFF, a); |
| michael@0 | 96 | |
| michael@0 | 97 | *destPixel++ = r; |
| michael@0 | 98 | *destPixel++ = g; |
| michael@0 | 99 | *destPixel++ = b; |
| michael@0 | 100 | *destPixel++ = a; |
| michael@0 | 101 | } else { |
| michael@0 | 102 | MOZ_ASSERT(format == SurfaceFormat::B8G8R8X8); |
| michael@0 | 103 | |
| michael@0 | 104 | const uint8_t r = (*srcPixel >> 16) & 0xFF; |
| michael@0 | 105 | const uint8_t g = (*srcPixel >> 8) & 0xFF; |
| michael@0 | 106 | const uint8_t b = (*srcPixel >> 0) & 0xFF; |
| michael@0 | 107 | |
| michael@0 | 108 | *destPixel++ = r; |
| michael@0 | 109 | *destPixel++ = g; |
| michael@0 | 110 | *destPixel++ = b; |
| michael@0 | 111 | *destPixel++ = 0xFF; // A |
| michael@0 | 112 | } |
| michael@0 | 113 | } |
| michael@0 | 114 | } |
| michael@0 | 115 | |
| michael@0 | 116 | dataSurface->Unmap(); |
| michael@0 | 117 | |
| michael@0 | 118 | return pixbuf; |
| michael@0 | 119 | } |
| michael@0 | 120 |
