Index: third_party/libwebp/webp/format_constants.h |
diff --git a/third_party/libwebp/webp/format_constants.h b/third_party/libwebp/webp/format_constants.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..7ce498f67285f62e1e896742b53521b7c6c67bf8 |
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+++ b/third_party/libwebp/webp/format_constants.h |
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+// Copyright 2012 Google Inc. All Rights Reserved. |
+// |
+// This code is licensed under the same terms as WebM: |
+// Software License Agreement: http://www.webmproject.org/license/software/ |
+// Additional IP Rights Grant: http://www.webmproject.org/license/additional/ |
+// ----------------------------------------------------------------------------- |
+// |
+// Internal header for constants related to WebP file format. |
+// |
+// Author: Urvang (urvang@google.com) |
+ |
+#ifndef WEBP_WEBP_FORMAT_CONSTANTS_H_ |
+#define WEBP_WEBP_FORMAT_CONSTANTS_H_ |
+ |
+// VP8 related constants. |
+#define VP8_SIGNATURE 0x9d012a // Signature in VP8 data. |
+#define VP8_MAX_PARTITION0_SIZE (1 << 19) // max size of mode partition |
+#define VP8_MAX_PARTITION_SIZE (1 << 24) // max size for token partition |
+#define VP8_FRAME_HEADER_SIZE 10 // Size of the frame header within VP8 data. |
+ |
+// VP8L related constants. |
+#define VP8L_SIGNATURE_SIZE 1 // VP8L signature size. |
+#define VP8L_MAGIC_BYTE 0x2f // VP8L signature byte. |
+#define VP8L_IMAGE_SIZE_BITS 14 // Number of bits used to store |
+ // width and height. |
+#define VP8L_VERSION_BITS 3 // 3 bits reserved for version. |
+#define VP8L_VERSION 0 // version 0 |
+#define VP8L_FRAME_HEADER_SIZE 5 // Size of the VP8L frame header. |
+ |
+#define MAX_PALETTE_SIZE 256 |
+#define MAX_CACHE_BITS 11 |
+#define HUFFMAN_CODES_PER_META_CODE 5 |
+#define ARGB_BLACK 0xff000000 |
+ |
+#define DEFAULT_CODE_LENGTH 8 |
+#define MAX_ALLOWED_CODE_LENGTH 15 |
+ |
+#define NUM_LITERAL_CODES 256 |
+#define NUM_LENGTH_CODES 24 |
+#define NUM_DISTANCE_CODES 40 |
+#define CODE_LENGTH_CODES 19 |
+ |
+#define MIN_HUFFMAN_BITS 2 // min number of Huffman bits |
+#define MAX_HUFFMAN_BITS 9 // max number of Huffman bits |
+ |
+#define TRANSFORM_PRESENT 1 // The bit to be written when next data |
+ // to be read is a transform. |
+#define NUM_TRANSFORMS 4 // Maximum number of allowed transform |
+ // in a bitstream. |
+typedef enum { |
+ PREDICTOR_TRANSFORM = 0, |
+ CROSS_COLOR_TRANSFORM = 1, |
+ SUBTRACT_GREEN = 2, |
+ COLOR_INDEXING_TRANSFORM = 3 |
+} VP8LImageTransformType; |
+ |
+// Alpha related constants. |
+#define ALPHA_HEADER_LEN 1 |
+#define ALPHA_NO_COMPRESSION 0 |
+#define ALPHA_LOSSLESS_COMPRESSION 1 |
+#define ALPHA_PREPROCESSED_LEVELS 1 |
+ |
+// Mux related constants. |
+#define TAG_SIZE 4 // Size of a chunk tag (e.g. "VP8L"). |
+#define CHUNK_SIZE_BYTES 4 // Size needed to store chunk's size. |
+#define CHUNK_HEADER_SIZE 8 // Size of a chunk header. |
+#define RIFF_HEADER_SIZE 12 // Size of the RIFF header ("RIFFnnnnWEBP"). |
+#define FRAME_CHUNK_SIZE 15 // Size of a FRM chunk. |
+#define LOOP_CHUNK_SIZE 2 // Size of a LOOP chunk. |
+#define TILE_CHUNK_SIZE 6 // Size of a TILE chunk. |
+#define VP8X_CHUNK_SIZE 10 // Size of a VP8X chunk. |
+ |
+#define TILING_FLAG_BIT 0x01 // Set if tiles are possibly used. |
+#define ANIMATION_FLAG_BIT 0x02 // Set if some animation is expected |
+#define ICC_FLAG_BIT 0x04 // Whether ICC is present or not. |
+#define METADATA_FLAG_BIT 0x08 // Set if some META chunk is possibly present. |
+#define ALPHA_FLAG_BIT 0x10 // Should be same as the ALPHA_FLAG in mux.h |
+#define ROTATION_FLAG_BITS 0xe0 // all 3 bits for rotation + symmetry |
+ |
+#define MAX_CANVAS_SIZE (1 << 24) // 24-bit max for VP8X width/height. |
+#define MAX_IMAGE_AREA (1ULL << 32) // 32-bit max for width x height. |
+#define MAX_LOOP_COUNT (1 << 16) // maximum value for loop-count |
+#define MAX_DURATION (1 << 24) // maximum duration |
+#define MAX_POSITION_OFFSET (1 << 24) // maximum frame/tile x/y offset |
+ |
+// Maximum chunk payload is such that adding the header and padding won't |
+// overflow a uint32_t. |
+#define MAX_CHUNK_PAYLOAD (~0U - CHUNK_HEADER_SIZE - 1) |
+ |
+#endif /* WEBP_WEBP_FORMAT_CONSTANTS_H_ */ |