99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
// Copyright 2012 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Data-types common to the mux and demux libraries.
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//
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// Author: Urvang (urvang@google.com)
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#ifndef WEBP_WEBP_MUX_TYPES_H_
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#define WEBP_WEBP_MUX_TYPES_H_
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#include <string.h> // memset()
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#include "./types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Note: forward declaring enumerations is not allowed in (strict) C and C++,
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// the types are left here for reference.
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// typedef enum WebPFeatureFlags WebPFeatureFlags;
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// typedef enum WebPMuxAnimDispose WebPMuxAnimDispose;
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// typedef enum WebPMuxAnimBlend WebPMuxAnimBlend;
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typedef struct WebPData WebPData;
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// VP8X Feature Flags.
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typedef enum WebPFeatureFlags {
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ANIMATION_FLAG = 0x00000002,
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XMP_FLAG = 0x00000004,
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EXIF_FLAG = 0x00000008,
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ALPHA_FLAG = 0x00000010,
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ICCP_FLAG = 0x00000020,
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ALL_VALID_FLAGS = 0x0000003e
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} WebPFeatureFlags;
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// Dispose method (animation only). Indicates how the area used by the current
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// frame is to be treated before rendering the next frame on the canvas.
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typedef enum WebPMuxAnimDispose {
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WEBP_MUX_DISPOSE_NONE, // Do not dispose.
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WEBP_MUX_DISPOSE_BACKGROUND // Dispose to background color.
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} WebPMuxAnimDispose;
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// Blend operation (animation only). Indicates how transparent pixels of the
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// current frame are blended with those of the previous canvas.
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typedef enum WebPMuxAnimBlend {
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WEBP_MUX_BLEND, // Blend.
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WEBP_MUX_NO_BLEND // Do not blend.
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} WebPMuxAnimBlend;
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// Data type used to describe 'raw' data, e.g., chunk data
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// (ICC profile, metadata) and WebP compressed image data.
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// 'bytes' memory must be allocated using WebPMalloc() and such.
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struct WebPData {
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const uint8_t* bytes;
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size_t size;
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};
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// Initializes the contents of the 'webp_data' object with default values.
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static WEBP_INLINE void WebPDataInit(WebPData* webp_data) {
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if (webp_data != NULL) {
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memset(webp_data, 0, sizeof(*webp_data));
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}
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}
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// Clears the contents of the 'webp_data' object by calling WebPFree().
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// Does not deallocate the object itself.
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static WEBP_INLINE void WebPDataClear(WebPData* webp_data) {
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if (webp_data != NULL) {
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WebPFree((void*)webp_data->bytes);
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WebPDataInit(webp_data);
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}
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}
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// Allocates necessary storage for 'dst' and copies the contents of 'src'.
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// Returns true on success.
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static WEBP_INLINE int WebPDataCopy(const WebPData* src, WebPData* dst) {
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if (src == NULL || dst == NULL) return 0;
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WebPDataInit(dst);
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if (src->bytes != NULL && src->size != 0) {
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dst->bytes = (uint8_t*)WebPMalloc(src->size);
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if (dst->bytes == NULL) return 0;
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memcpy((void*)dst->bytes, src->bytes, src->size);
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dst->size = src->size;
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}
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return 1;
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}
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // WEBP_WEBP_MUX_TYPES_H_
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