1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "nsIconDecoder.h"
8 #include "RasterImage.h"
9 #include "SurfacePipeFactory.h"
10 #include "gfxPlatform.h"
11
12 using namespace mozilla::gfx;
13
14 namespace mozilla {
15 namespace image {
16
17 static const uint32_t ICON_HEADER_SIZE = 4;
18
nsIconDecoder(RasterImage * aImage)19 nsIconDecoder::nsIconDecoder(RasterImage* aImage)
20 : Decoder(aImage),
21 mLexer(Transition::To(State::HEADER, ICON_HEADER_SIZE),
22 Transition::TerminateSuccess()),
23 mBytesPerRow() // set by ReadHeader()
24 {
25 // Nothing to do
26 }
27
~nsIconDecoder()28 nsIconDecoder::~nsIconDecoder() {}
29
DoDecode(SourceBufferIterator & aIterator,IResumable * aOnResume)30 LexerResult nsIconDecoder::DoDecode(SourceBufferIterator& aIterator,
31 IResumable* aOnResume) {
32 MOZ_ASSERT(!HasError(), "Shouldn't call DoDecode after error!");
33
34 return mLexer.Lex(aIterator, aOnResume,
35 [=](State aState, const char* aData, size_t aLength) {
36 switch (aState) {
37 case State::HEADER:
38 return ReadHeader(aData);
39 case State::ROW_OF_PIXELS:
40 return ReadRowOfPixels(aData, aLength);
41 case State::FINISH:
42 return Finish();
43 default:
44 MOZ_CRASH("Unknown State");
45 }
46 });
47 }
48
ReadHeader(const char * aData)49 LexerTransition<nsIconDecoder::State> nsIconDecoder::ReadHeader(
50 const char* aData) {
51 // Grab the width and height.
52 uint8_t width = uint8_t(aData[0]);
53 uint8_t height = uint8_t(aData[1]);
54 SurfaceFormat format = SurfaceFormat(aData[2]);
55 bool transform = bool(aData[3]);
56
57 // FIXME(aosmond): On OSX we get the icon in device space and already
58 // premultiplied, so we can't support the surface flags with icons right now.
59 SurfacePipeFlags pipeFlags = SurfacePipeFlags();
60 if (transform) {
61 if (mCMSMode == CMSMode::All) {
62 mTransform = GetCMSsRGBTransform(format);
63 }
64
65 if (!(GetSurfaceFlags() & SurfaceFlags::NO_PREMULTIPLY_ALPHA)) {
66 pipeFlags |= SurfacePipeFlags::PREMULTIPLY_ALPHA;
67 }
68 }
69
70 // The input is 32bpp, so we expect 4 bytes of data per pixel.
71 mBytesPerRow = width * 4;
72
73 // Post our size to the superclass.
74 PostSize(width, height);
75
76 // Icons have alpha.
77 PostHasTransparency();
78
79 // If we're doing a metadata decode, we're done.
80 if (IsMetadataDecode()) {
81 return Transition::TerminateSuccess();
82 }
83
84 MOZ_ASSERT(!mImageData, "Already have a buffer allocated?");
85 Maybe<SurfacePipe> pipe = SurfacePipeFactory::CreateSurfacePipe(
86 this, Size(), OutputSize(), FullFrame(), format, SurfaceFormat::OS_RGBA,
87 /* aAnimParams */ Nothing(), mTransform, pipeFlags);
88 if (!pipe) {
89 return Transition::TerminateFailure();
90 }
91
92 mPipe = std::move(*pipe);
93
94 MOZ_ASSERT(mImageData, "Should have a buffer now");
95
96 return Transition::To(State::ROW_OF_PIXELS, mBytesPerRow);
97 }
98
ReadRowOfPixels(const char * aData,size_t aLength)99 LexerTransition<nsIconDecoder::State> nsIconDecoder::ReadRowOfPixels(
100 const char* aData, size_t aLength) {
101 MOZ_ASSERT(aLength % 4 == 0, "Rows should contain a multiple of four bytes");
102
103 auto result = mPipe.WriteBuffer(reinterpret_cast<const uint32_t*>(aData));
104 MOZ_ASSERT(result != WriteState::FAILURE);
105
106 Maybe<SurfaceInvalidRect> invalidRect = mPipe.TakeInvalidRect();
107 if (invalidRect) {
108 PostInvalidation(invalidRect->mInputSpaceRect,
109 Some(invalidRect->mOutputSpaceRect));
110 }
111
112 return result == WriteState::FINISHED
113 ? Transition::To(State::FINISH, 0)
114 : Transition::To(State::ROW_OF_PIXELS, mBytesPerRow);
115 }
116
Finish()117 LexerTransition<nsIconDecoder::State> nsIconDecoder::Finish() {
118 PostFrameStop();
119 PostDecodeDone();
120
121 return Transition::TerminateSuccess();
122 }
123
124 } // namespace image
125 } // namespace mozilla
126