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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /image/decoders/nsICODecoder.h
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'image/decoders/nsICODecoder.h')
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1 files changed, 106 insertions, 0 deletions
diff --git a/image/decoders/nsICODecoder.h b/image/decoders/nsICODecoder.h
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+/* vim:set tw=80 expandtab softtabstop=4 ts=4 sw=2: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_image_decoders_nsICODecoder_h
+#define mozilla_image_decoders_nsICODecoder_h
+
+#include "StreamingLexer.h"
+#include "Decoder.h"
+#include "Downscaler.h"
+#include "imgFrame.h"
+#include "mozilla/gfx/2D.h"
+#include "nsBMPDecoder.h"
+#include "nsPNGDecoder.h"
+#include "ICOFileHeaders.h"
+
+namespace mozilla {
+namespace image {
+
+class RasterImage;
+
+enum class ICOState {
+ HEADER,
+ DIR_ENTRY,
+ FINISHED_DIR_ENTRY,
+ ITERATE_UNSIZED_DIR_ENTRY,
+ SKIP_TO_RESOURCE,
+ FOUND_RESOURCE,
+ SNIFF_RESOURCE,
+ READ_RESOURCE,
+ PREPARE_FOR_MASK,
+ READ_MASK_ROW,
+ FINISH_MASK,
+ SKIP_MASK,
+ FINISHED_RESOURCE
+};
+
+class nsICODecoder : public Decoder {
+ public:
+ virtual ~nsICODecoder() {}
+
+ /// @return The offset from the beginning of the ICO to the first resource.
+ size_t FirstResourceOffset() const;
+
+ DecoderType GetType() const override { return DecoderType::ICO; }
+ LexerResult DoDecode(SourceBufferIterator& aIterator,
+ IResumable* aOnResume) override;
+ nsresult FinishInternal() override;
+ nsresult FinishWithErrorInternal() override;
+
+ private:
+ friend class DecoderFactory;
+
+ // Decoders should only be instantiated via DecoderFactory.
+ explicit nsICODecoder(RasterImage* aImage);
+
+ // Flushes the contained decoder to read all available data and sets the
+ // appropriate errors. Returns true if there are no errors.
+ bool FlushContainedDecoder();
+
+ // Gets decoder state from the contained decoder so it's visible externally.
+ nsresult GetFinalStateFromContainedDecoder();
+
+ // Obtains the number of colors from the BPP, mBPP must be filled in
+ uint16_t GetNumColors();
+
+ LexerTransition<ICOState> ReadHeader(const char* aData);
+ LexerTransition<ICOState> ReadDirEntry(const char* aData);
+ LexerTransition<ICOState> IterateUnsizedDirEntry();
+ LexerTransition<ICOState> FinishDirEntry();
+ LexerTransition<ICOState> SniffResource(const char* aData);
+ LexerTransition<ICOState> ReadResource();
+ LexerTransition<ICOState> ReadBIH(const char* aData);
+ LexerTransition<ICOState> PrepareForMask();
+ LexerTransition<ICOState> ReadMaskRow(const char* aData);
+ LexerTransition<ICOState> FinishMask();
+ LexerTransition<ICOState> FinishResource();
+
+ struct IconDirEntryEx : public IconDirEntry {
+ OrientedIntSize mSize;
+ };
+
+ StreamingLexer<ICOState, 32> mLexer; // The lexer.
+ Maybe<Downscaler> mDownscaler; // The downscaler used for the mask.
+ RefPtr<Decoder> mContainedDecoder; // Either a BMP or PNG decoder.
+ Maybe<SourceBufferIterator>
+ mReturnIterator; // Iterator to save return point.
+ UniquePtr<uint8_t[]> mMaskBuffer; // A temporary buffer for the alpha mask.
+ nsTArray<IconDirEntryEx> mDirEntries; // Valid dir entries with a size.
+ nsTArray<IconDirEntryEx> mUnsizedDirEntries; // Dir entries without a size.
+ IconDirEntryEx* mDirEntry; // The dir entry for the selected resource.
+ uint16_t mNumIcons; // Stores the number of icons in the ICO file.
+ uint16_t mCurrIcon; // Stores the current dir entry index we are processing.
+ uint16_t mBPP; // The BPP of the resource we're decoding.
+ uint32_t
+ mMaskRowSize; // The size in bytes of each row in the BMP alpha mask.
+ uint32_t mCurrMaskLine; // The line of the BMP alpha mask we're processing.
+ bool mIsCursor; // Is this ICO a cursor?
+ bool mHasMaskAlpha; // Did the BMP alpha mask have any transparency?
+};
+
+} // namespace image
+} // namespace mozilla
+
+#endif // mozilla_image_decoders_nsICODecoder_h