mirror of
https://github.com/webmproject/libwebp.git
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Add a WEBP_NODISCARD
Change-Id: Ice66f2aa6358474d728fb19c571edc86ed139a49
This commit is contained in:
Vincent Rabaud
@ -48,34 +48,33 @@ WEBP_EXTERN int WebPGetDecoderVersion(void);
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// RIFF + VP8X + (optional chunks) + VP8(L)
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// ALPH + VP8 <-- Not a valid WebP format: only allowed for internal purpose.
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// VP8(L) <-- Not a valid WebP format: only allowed for internal purpose.
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WEBP_EXTERN int WebPGetInfo(const uint8_t* data, size_t data_size,
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int* width, int* height);
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WEBP_NODISCARD WEBP_EXTERN int WebPGetInfo(
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const uint8_t* data, size_t data_size, int* width, int* height);
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// Decodes WebP images pointed to by 'data' and returns RGBA samples, along
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// with the dimensions in *width and *height. The ordering of samples in
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// memory is R, G, B, A, R, G, B, A... in scan order (endian-independent).
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// The returned pointer should be deleted calling WebPFree().
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// Returns NULL in case of error.
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WEBP_EXTERN uint8_t* WebPDecodeRGBA(const uint8_t* data, size_t data_size,
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int* width, int* height);
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeRGBA(
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const uint8_t* data, size_t data_size, int* width, int* height);
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// Same as WebPDecodeRGBA, but returning A, R, G, B, A, R, G, B... ordered data.
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WEBP_EXTERN uint8_t* WebPDecodeARGB(const uint8_t* data, size_t data_size,
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int* width, int* height);
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeARGB(
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const uint8_t* data, size_t data_size, int* width, int* height);
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// Same as WebPDecodeRGBA, but returning B, G, R, A, B, G, R, A... ordered data.
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WEBP_EXTERN uint8_t* WebPDecodeBGRA(const uint8_t* data, size_t data_size,
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int* width, int* height);
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeBGRA(
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const uint8_t* data, size_t data_size, int* width, int* height);
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// Same as WebPDecodeRGBA, but returning R, G, B, R, G, B... ordered data.
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// If the bitstream contains transparency, it is ignored.
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WEBP_EXTERN uint8_t* WebPDecodeRGB(const uint8_t* data, size_t data_size,
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int* width, int* height);
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeRGB(
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const uint8_t* data, size_t data_size, int* width, int* height);
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// Same as WebPDecodeRGB, but returning B, G, R, B, G, R... ordered data.
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WEBP_EXTERN uint8_t* WebPDecodeBGR(const uint8_t* data, size_t data_size,
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int* width, int* height);
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeBGR(
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const uint8_t* data, size_t data_size, int* width, int* height);
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// Decode WebP images pointed to by 'data' to Y'UV format(*). The pointer
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// returned is the Y samples buffer. Upon return, *u and *v will point to
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@ -87,10 +86,9 @@ WEBP_EXTERN uint8_t* WebPDecodeBGR(const uint8_t* data, size_t data_size,
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// 'width' and 'height' may be NULL, the other pointers must not be.
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// Returns NULL in case of error.
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// (*) Also named Y'CbCr. See: https://en.wikipedia.org/wiki/YCbCr
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WEBP_EXTERN uint8_t* WebPDecodeYUV(const uint8_t* data, size_t data_size,
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int* width, int* height,
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uint8_t** u, uint8_t** v,
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int* stride, int* uv_stride);
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeYUV(
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const uint8_t* data, size_t data_size, int* width, int* height,
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uint8_t** u, uint8_t** v, int* stride, int* uv_stride);
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// These five functions are variants of the above ones, that decode the image
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// directly into a pre-allocated buffer 'output_buffer'. The maximum storage
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@ -100,22 +98,22 @@ WEBP_EXTERN uint8_t* WebPDecodeYUV(const uint8_t* data, size_t data_size,
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// The parameter 'output_stride' specifies the distance (in bytes)
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// between scanlines. Hence, output_buffer_size is expected to be at least
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// output_stride x picture-height.
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WEBP_EXTERN uint8_t* WebPDecodeRGBAInto(
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeRGBAInto(
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const uint8_t* data, size_t data_size,
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uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
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WEBP_EXTERN uint8_t* WebPDecodeARGBInto(
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeARGBInto(
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const uint8_t* data, size_t data_size,
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uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
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WEBP_EXTERN uint8_t* WebPDecodeBGRAInto(
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeBGRAInto(
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const uint8_t* data, size_t data_size,
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uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
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// RGB and BGR variants. Here too the transparency information, if present,
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// will be dropped and ignored.
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WEBP_EXTERN uint8_t* WebPDecodeRGBInto(
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeRGBInto(
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const uint8_t* data, size_t data_size,
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uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
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WEBP_EXTERN uint8_t* WebPDecodeBGRInto(
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeBGRInto(
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const uint8_t* data, size_t data_size,
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uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
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@ -126,7 +124,7 @@ WEBP_EXTERN uint8_t* WebPDecodeBGRInto(
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// 'u_size' and 'v_size' respectively.
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// Pointer to the luma plane ('*luma') is returned or NULL if an error occurred
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// during decoding (or because some buffers were found to be too small).
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WEBP_EXTERN uint8_t* WebPDecodeYUVInto(
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeYUVInto(
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const uint8_t* data, size_t data_size,
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uint8_t* luma, size_t luma_size, int luma_stride,
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uint8_t* u, size_t u_size, int u_stride,
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@ -217,11 +215,11 @@ struct WebPDecBuffer {
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};
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// Internal, version-checked, entry point
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WEBP_EXTERN int WebPInitDecBufferInternal(WebPDecBuffer*, int);
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WEBP_NODISCARD WEBP_EXTERN int WebPInitDecBufferInternal(WebPDecBuffer*, int);
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// Initialize the structure as empty. Must be called before any other use.
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// Returns false in case of version mismatch
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static WEBP_INLINE int WebPInitDecBuffer(WebPDecBuffer* buffer) {
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WEBP_NODISCARD static WEBP_INLINE int WebPInitDecBuffer(WebPDecBuffer* buffer) {
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return WebPInitDecBufferInternal(buffer, WEBP_DECODER_ABI_VERSION);
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}
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@ -232,7 +230,7 @@ WEBP_EXTERN void WebPFreeDecBuffer(WebPDecBuffer* buffer);
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//------------------------------------------------------------------------------
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// Enumeration of the status codes
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typedef enum VP8StatusCode {
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typedef enum WEBP_NODISCARD VP8StatusCode {
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VP8_STATUS_OK = 0,
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VP8_STATUS_OUT_OF_MEMORY,
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VP8_STATUS_INVALID_PARAM,
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@ -282,7 +280,8 @@ typedef enum VP8StatusCode {
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// within valid bounds.
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// All other fields of WebPDecBuffer MUST remain constant between calls.
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// Returns NULL if the allocation failed.
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WEBP_EXTERN WebPIDecoder* WebPINewDecoder(WebPDecBuffer* output_buffer);
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WEBP_NODISCARD WEBP_EXTERN WebPIDecoder* WebPINewDecoder(
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WebPDecBuffer* output_buffer);
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// This function allocates and initializes an incremental-decoder object, which
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// will output the RGB/A samples specified by 'csp' into a preallocated
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@ -294,7 +293,7 @@ WEBP_EXTERN WebPIDecoder* WebPINewDecoder(WebPDecBuffer* output_buffer);
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// colorspace 'csp' is taken into account for allocating this buffer. All other
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// parameters are ignored.
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// Returns NULL if the allocation failed, or if some parameters are invalid.
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WEBP_EXTERN WebPIDecoder* WebPINewRGB(
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WEBP_NODISCARD WEBP_EXTERN WebPIDecoder* WebPINewRGB(
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WEBP_CSP_MODE csp,
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uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
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@ -309,7 +308,7 @@ WEBP_EXTERN WebPIDecoder* WebPINewRGB(
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// In this case, the output buffer will be automatically allocated (using
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// MODE_YUVA) when decoding starts. All parameters are then ignored.
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// Returns NULL if the allocation failed or if a parameter is invalid.
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WEBP_EXTERN WebPIDecoder* WebPINewYUVA(
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WEBP_NODISCARD WEBP_EXTERN WebPIDecoder* WebPINewYUVA(
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uint8_t* luma, size_t luma_size, int luma_stride,
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uint8_t* u, size_t u_size, int u_stride,
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uint8_t* v, size_t v_size, int v_stride,
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@ -317,7 +316,7 @@ WEBP_EXTERN WebPIDecoder* WebPINewYUVA(
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// Deprecated version of the above, without the alpha plane.
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// Kept for backward compatibility.
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WEBP_EXTERN WebPIDecoder* WebPINewYUV(
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WEBP_NODISCARD WEBP_EXTERN WebPIDecoder* WebPINewYUV(
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uint8_t* luma, size_t luma_size, int luma_stride,
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uint8_t* u, size_t u_size, int u_stride,
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uint8_t* v, size_t v_size, int v_stride);
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@ -347,21 +346,21 @@ WEBP_EXTERN VP8StatusCode WebPIUpdate(
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// (*last_y, *width etc.) can be NULL if corresponding information is not
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// needed. The values in these pointers are only valid on successful (non-NULL)
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// return.
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WEBP_EXTERN uint8_t* WebPIDecGetRGB(
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPIDecGetRGB(
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const WebPIDecoder* idec, int* last_y,
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int* width, int* height, int* stride);
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// Same as above function to get a YUVA image. Returns pointer to the luma
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// plane or NULL in case of error. If there is no alpha information
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// the alpha pointer '*a' will be returned NULL.
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WEBP_EXTERN uint8_t* WebPIDecGetYUVA(
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WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPIDecGetYUVA(
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const WebPIDecoder* idec, int* last_y,
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uint8_t** u, uint8_t** v, uint8_t** a,
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int* width, int* height, int* stride, int* uv_stride, int* a_stride);
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// Deprecated alpha-less version of WebPIDecGetYUVA(): it will ignore the
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// alpha information (if present). Kept for backward compatibility.
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static WEBP_INLINE uint8_t* WebPIDecGetYUV(
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WEBP_NODISCARD static WEBP_INLINE uint8_t* WebPIDecGetYUV(
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const WebPIDecoder* idec, int* last_y, uint8_t** u, uint8_t** v,
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int* width, int* height, int* stride, int* uv_stride) {
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return WebPIDecGetYUVA(idec, last_y, u, v, NULL, width, height,
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@ -374,7 +373,7 @@ static WEBP_INLINE uint8_t* WebPIDecGetYUV(
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// Returns NULL in case the incremental decoder object is in an invalid state.
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// Otherwise returns the pointer to the internal representation. This structure
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// is read-only, tied to WebPIDecoder's lifespan and should not be modified.
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WEBP_EXTERN const WebPDecBuffer* WebPIDecodedArea(
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WEBP_NODISCARD WEBP_EXTERN const WebPDecBuffer* WebPIDecodedArea(
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const WebPIDecoder* idec, int* left, int* top, int* width, int* height);
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//------------------------------------------------------------------------------
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@ -469,12 +468,14 @@ struct WebPDecoderConfig {
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};
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// Internal, version-checked, entry point
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WEBP_EXTERN int WebPInitDecoderConfigInternal(WebPDecoderConfig*, int);
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WEBP_NODISCARD WEBP_EXTERN int WebPInitDecoderConfigInternal(WebPDecoderConfig*,
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int);
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// Initialize the configuration as empty. This function must always be
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// called first, unless WebPGetFeatures() is to be called.
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// Returns false in case of mismatched version.
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static WEBP_INLINE int WebPInitDecoderConfig(WebPDecoderConfig* config) {
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WEBP_NODISCARD static WEBP_INLINE int WebPInitDecoderConfig(
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WebPDecoderConfig* config) {
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return WebPInitDecoderConfigInternal(config, WEBP_DECODER_ABI_VERSION);
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}
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@ -489,8 +490,8 @@ static WEBP_INLINE int WebPInitDecoderConfig(WebPDecoderConfig* config) {
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// The return WebPIDecoder object must always be deleted calling WebPIDelete().
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// Returns NULL in case of error (and config->status will then reflect
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// the error condition, if available).
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WEBP_EXTERN WebPIDecoder* WebPIDecode(const uint8_t* data, size_t data_size,
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WebPDecoderConfig* config);
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WEBP_NODISCARD WEBP_EXTERN WebPIDecoder* WebPIDecode(
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const uint8_t* data, size_t data_size, WebPDecoderConfig* config);
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// Non-incremental version. This version decodes the full data at once, taking
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// 'config' into account. Returns decoding status (which should be VP8_STATUS_OK
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@ -50,6 +50,7 @@
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#include "./decode.h" // for WEBP_CSP_MODE
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#include "./mux_types.h"
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#include "./types.h"
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#ifdef __cplusplus
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extern "C" {
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@ -85,13 +86,13 @@ typedef enum WebPDemuxState {
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} WebPDemuxState;
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// Internal, version-checked, entry point
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WEBP_EXTERN WebPDemuxer* WebPDemuxInternal(
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WEBP_NODISCARD WEBP_EXTERN WebPDemuxer* WebPDemuxInternal(
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const WebPData*, int, WebPDemuxState*, int);
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// Parses the full WebP file given by 'data'. For single images the WebP file
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// header alone or the file header and the chunk header may be absent.
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// Returns a WebPDemuxer object on successful parse, NULL otherwise.
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static WEBP_INLINE WebPDemuxer* WebPDemux(const WebPData* data) {
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WEBP_NODISCARD static WEBP_INLINE WebPDemuxer* WebPDemux(const WebPData* data) {
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return WebPDemuxInternal(data, 0, NULL, WEBP_DEMUX_ABI_VERSION);
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}
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@ -103,7 +104,7 @@ static WEBP_INLINE WebPDemuxer* WebPDemux(const WebPData* data) {
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// If this data is volatile, the demuxer object should be deleted (by calling
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// WebPDemuxDelete()) and WebPDemuxPartial() called again on the new data.
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// This is usually an inexpensive operation.
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static WEBP_INLINE WebPDemuxer* WebPDemuxPartial(
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WEBP_NODISCARD static WEBP_INLINE WebPDemuxer* WebPDemuxPartial(
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const WebPData* data, WebPDemuxState* state) {
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return WebPDemuxInternal(data, 1, state, WEBP_DEMUX_ABI_VERSION);
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}
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@ -164,14 +165,14 @@ struct WebPIterator {
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// Returns false if 'dmux' is NULL or frame 'frame_number' is not present.
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// Call WebPDemuxReleaseIterator() when use of the iterator is complete.
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// NOTE: 'dmux' must persist for the lifetime of 'iter'.
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WEBP_EXTERN int WebPDemuxGetFrame(
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WEBP_NODISCARD WEBP_EXTERN int WebPDemuxGetFrame(
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const WebPDemuxer* dmux, int frame_number, WebPIterator* iter);
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// Sets 'iter->fragment' to point to the next ('iter->frame_num' + 1) or
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// previous ('iter->frame_num' - 1) frame. These functions do not loop.
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// Returns true on success, false otherwise.
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WEBP_EXTERN int WebPDemuxNextFrame(WebPIterator* iter);
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WEBP_EXTERN int WebPDemuxPrevFrame(WebPIterator* iter);
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WEBP_NODISCARD WEBP_EXTERN int WebPDemuxNextFrame(WebPIterator* iter);
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WEBP_NODISCARD WEBP_EXTERN int WebPDemuxPrevFrame(WebPIterator* iter);
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// Releases any memory associated with 'iter'.
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// Must be called before any subsequent calls to WebPDemuxGetChunk() on the same
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@ -202,15 +203,16 @@ struct WebPChunkIterator {
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// payloads are accessed through WebPDemuxGetFrame() and related functions.
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// Call WebPDemuxReleaseChunkIterator() when use of the iterator is complete.
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// NOTE: 'dmux' must persist for the lifetime of the iterator.
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WEBP_EXTERN int WebPDemuxGetChunk(const WebPDemuxer* dmux,
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const char fourcc[4], int chunk_number,
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WebPChunkIterator* iter);
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WEBP_NODISCARD WEBP_EXTERN int WebPDemuxGetChunk(const WebPDemuxer* dmux,
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const char fourcc[4],
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int chunk_number,
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WebPChunkIterator* iter);
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// Sets 'iter->chunk' to point to the next ('iter->chunk_num' + 1) or previous
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// ('iter->chunk_num' - 1) chunk. These functions do not loop.
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// Returns true on success, false otherwise.
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WEBP_EXTERN int WebPDemuxNextChunk(WebPChunkIterator* iter);
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WEBP_EXTERN int WebPDemuxPrevChunk(WebPChunkIterator* iter);
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WEBP_NODISCARD WEBP_EXTERN int WebPDemuxNextChunk(WebPChunkIterator* iter);
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WEBP_NODISCARD WEBP_EXTERN int WebPDemuxPrevChunk(WebPChunkIterator* iter);
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// Releases any memory associated with 'iter'.
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// Must be called before destroying the associated WebPDemuxer with
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@ -257,21 +259,21 @@ struct WebPAnimDecoderOptions {
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};
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// Internal, version-checked, entry point.
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WEBP_EXTERN int WebPAnimDecoderOptionsInitInternal(
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WEBP_NODISCARD WEBP_EXTERN int WebPAnimDecoderOptionsInitInternal(
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WebPAnimDecoderOptions*, int);
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// Should always be called, to initialize a fresh WebPAnimDecoderOptions
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// structure before modification. Returns false in case of version mismatch.
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// WebPAnimDecoderOptionsInit() must have succeeded before using the
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// 'dec_options' object.
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static WEBP_INLINE int WebPAnimDecoderOptionsInit(
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WEBP_NODISCARD static WEBP_INLINE int WebPAnimDecoderOptionsInit(
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WebPAnimDecoderOptions* dec_options) {
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return WebPAnimDecoderOptionsInitInternal(dec_options,
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WEBP_DEMUX_ABI_VERSION);
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}
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// Internal, version-checked, entry point.
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WEBP_EXTERN WebPAnimDecoder* WebPAnimDecoderNewInternal(
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WEBP_NODISCARD WEBP_EXTERN WebPAnimDecoder* WebPAnimDecoderNewInternal(
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const WebPData*, const WebPAnimDecoderOptions*, int);
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// Creates and initializes a WebPAnimDecoder object.
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@ -284,7 +286,7 @@ WEBP_EXTERN WebPAnimDecoder* WebPAnimDecoderNewInternal(
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// Returns:
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// A pointer to the newly created WebPAnimDecoder object, or NULL in case of
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// parsing error, invalid option or memory error.
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static WEBP_INLINE WebPAnimDecoder* WebPAnimDecoderNew(
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WEBP_NODISCARD static WEBP_INLINE WebPAnimDecoder* WebPAnimDecoderNew(
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const WebPData* webp_data, const WebPAnimDecoderOptions* dec_options) {
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return WebPAnimDecoderNewInternal(webp_data, dec_options,
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WEBP_DEMUX_ABI_VERSION);
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@ -306,8 +308,8 @@ struct WebPAnimInfo {
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// info - (out) global information fetched from the animation.
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// Returns:
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// True on success.
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WEBP_EXTERN int WebPAnimDecoderGetInfo(const WebPAnimDecoder* dec,
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WebPAnimInfo* info);
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WEBP_NODISCARD WEBP_EXTERN int WebPAnimDecoderGetInfo(
|
||||
const WebPAnimDecoder* dec, WebPAnimInfo* info);
|
||||
|
||||
// Fetch the next frame from 'dec' based on options supplied to
|
||||
// WebPAnimDecoderNew(). This will be a fully reconstructed canvas of size
|
||||
@ -321,8 +323,9 @@ WEBP_EXTERN int WebPAnimDecoderGetInfo(const WebPAnimDecoder* dec,
|
||||
// Returns:
|
||||
// False if any of the arguments are NULL, or if there is a parsing or
|
||||
// decoding error, or if there are no more frames. Otherwise, returns true.
|
||||
WEBP_EXTERN int WebPAnimDecoderGetNext(WebPAnimDecoder* dec,
|
||||
uint8_t** buf, int* timestamp);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPAnimDecoderGetNext(WebPAnimDecoder* dec,
|
||||
uint8_t** buf,
|
||||
int* timestamp);
|
||||
|
||||
// Check if there are more frames left to decode.
|
||||
// Parameters:
|
||||
@ -330,7 +333,8 @@ WEBP_EXTERN int WebPAnimDecoderGetNext(WebPAnimDecoder* dec,
|
||||
// Returns:
|
||||
// True if 'dec' is not NULL and some frames are yet to be decoded.
|
||||
// Otherwise, returns false.
|
||||
WEBP_EXTERN int WebPAnimDecoderHasMoreFrames(const WebPAnimDecoder* dec);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPAnimDecoderHasMoreFrames(
|
||||
const WebPAnimDecoder* dec);
|
||||
|
||||
// Resets the WebPAnimDecoder object, so that next call to
|
||||
// WebPAnimDecoderGetNext() will restart decoding from 1st frame. This would be
|
||||
@ -348,7 +352,7 @@ WEBP_EXTERN void WebPAnimDecoderReset(WebPAnimDecoder* dec);
|
||||
//
|
||||
// Parameters:
|
||||
// dec - (in) decoder instance from which the demuxer object is to be fetched.
|
||||
WEBP_EXTERN const WebPDemuxer* WebPAnimDecoderGetDemuxer(
|
||||
WEBP_NODISCARD WEBP_EXTERN const WebPDemuxer* WebPAnimDecoderGetDemuxer(
|
||||
const WebPAnimDecoder* dec);
|
||||
|
||||
// Deletes the WebPAnimDecoder object.
|
||||
|
||||
@ -164,13 +164,14 @@ typedef enum WebPPreset {
|
||||
} WebPPreset;
|
||||
|
||||
// Internal, version-checked, entry point
|
||||
WEBP_EXTERN int WebPConfigInitInternal(WebPConfig*, WebPPreset, float, int);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPConfigInitInternal(WebPConfig*, WebPPreset,
|
||||
float, int);
|
||||
|
||||
// Should always be called, to initialize a fresh WebPConfig structure before
|
||||
// modification. Returns false in case of version mismatch. WebPConfigInit()
|
||||
// must have succeeded before using the 'config' object.
|
||||
// Note that the default values are lossless=0 and quality=75.
|
||||
static WEBP_INLINE int WebPConfigInit(WebPConfig* config) {
|
||||
WEBP_NODISCARD static WEBP_INLINE int WebPConfigInit(WebPConfig* config) {
|
||||
return WebPConfigInitInternal(config, WEBP_PRESET_DEFAULT, 75.f,
|
||||
WEBP_ENCODER_ABI_VERSION);
|
||||
}
|
||||
@ -179,8 +180,9 @@ static WEBP_INLINE int WebPConfigInit(WebPConfig* config) {
|
||||
// set of parameters (referred to by 'preset') and a given quality factor.
|
||||
// This function can be called as a replacement to WebPConfigInit(). Will
|
||||
// return false in case of error.
|
||||
static WEBP_INLINE int WebPConfigPreset(WebPConfig* config,
|
||||
WebPPreset preset, float quality) {
|
||||
WEBP_NODISCARD static WEBP_INLINE int WebPConfigPreset(WebPConfig* config,
|
||||
WebPPreset preset,
|
||||
float quality) {
|
||||
return WebPConfigInitInternal(config, preset, quality,
|
||||
WEBP_ENCODER_ABI_VERSION);
|
||||
}
|
||||
@ -191,11 +193,12 @@ static WEBP_INLINE int WebPConfigPreset(WebPConfig* config,
|
||||
// speed and final compressed size.
|
||||
// This function will overwrite several fields from config: 'method', 'quality'
|
||||
// and 'lossless'. Returns false in case of parameter error.
|
||||
WEBP_EXTERN int WebPConfigLosslessPreset(WebPConfig* config, int level);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPConfigLosslessPreset(WebPConfig* config,
|
||||
int level);
|
||||
|
||||
// Returns true if 'config' is non-NULL and all configuration parameters are
|
||||
// within their valid ranges.
|
||||
WEBP_EXTERN int WebPValidateConfig(const WebPConfig* config);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPValidateConfig(const WebPConfig* config);
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
// Input / Output
|
||||
@ -255,8 +258,8 @@ WEBP_EXTERN void WebPMemoryWriterClear(WebPMemoryWriter* writer);
|
||||
// The custom writer to be used with WebPMemoryWriter as custom_ptr. Upon
|
||||
// completion, writer.mem and writer.size will hold the coded data.
|
||||
// writer.mem must be freed by calling WebPMemoryWriterClear.
|
||||
WEBP_EXTERN int WebPMemoryWrite(const uint8_t* data, size_t data_size,
|
||||
const WebPPicture* picture);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPMemoryWrite(
|
||||
const uint8_t* data, size_t data_size, const WebPPicture* picture);
|
||||
|
||||
// Progress hook, called from time to time to report progress. It can return
|
||||
// false to request an abort of the encoding process, or true otherwise if
|
||||
@ -364,13 +367,13 @@ struct WebPPicture {
|
||||
};
|
||||
|
||||
// Internal, version-checked, entry point
|
||||
WEBP_EXTERN int WebPPictureInitInternal(WebPPicture*, int);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureInitInternal(WebPPicture*, int);
|
||||
|
||||
// Should always be called, to initialize the structure. Returns false in case
|
||||
// of version mismatch. WebPPictureInit() must have succeeded before using the
|
||||
// 'picture' object.
|
||||
// Note that, by default, use_argb is false and colorspace is WEBP_YUV420.
|
||||
static WEBP_INLINE int WebPPictureInit(WebPPicture* picture) {
|
||||
WEBP_NODISCARD static WEBP_INLINE int WebPPictureInit(WebPPicture* picture) {
|
||||
return WebPPictureInitInternal(picture, WEBP_ENCODER_ABI_VERSION);
|
||||
}
|
||||
|
||||
@ -381,7 +384,7 @@ static WEBP_INLINE int WebPPictureInit(WebPPicture* picture) {
|
||||
// Allocate y/u/v buffers as per colorspace/width/height specification.
|
||||
// Note! This function will free the previous buffer if needed.
|
||||
// Returns false in case of memory error.
|
||||
WEBP_EXTERN int WebPPictureAlloc(WebPPicture* picture);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureAlloc(WebPPicture* picture);
|
||||
|
||||
// Release the memory allocated by WebPPictureAlloc() or WebPPictureImport*().
|
||||
// Note that this function does _not_ free the memory used by the 'picture'
|
||||
@ -394,7 +397,8 @@ WEBP_EXTERN void WebPPictureFree(WebPPicture* picture);
|
||||
// will fully own the copied pixels (this is not a view). The 'dst' picture need
|
||||
// not be initialized as its content is overwritten.
|
||||
// Returns false in case of memory allocation error.
|
||||
WEBP_EXTERN int WebPPictureCopy(const WebPPicture* src, WebPPicture* dst);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureCopy(const WebPPicture* src,
|
||||
WebPPicture* dst);
|
||||
|
||||
// Compute the single distortion for packed planes of samples.
|
||||
// 'src' will be compared to 'ref', and the raw distortion stored into
|
||||
@ -403,19 +407,18 @@ WEBP_EXTERN int WebPPictureCopy(const WebPPicture* src, WebPPicture* dst);
|
||||
// 'x_step' is the horizontal stride (in bytes) between samples.
|
||||
// 'src/ref_stride' is the byte distance between rows.
|
||||
// Returns false in case of error (bad parameter, memory allocation error, ...).
|
||||
WEBP_EXTERN int WebPPlaneDistortion(const uint8_t* src, size_t src_stride,
|
||||
const uint8_t* ref, size_t ref_stride,
|
||||
int width, int height,
|
||||
size_t x_step,
|
||||
int type, // 0 = PSNR, 1 = SSIM, 2 = LSIM
|
||||
float* distortion, float* result);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPlaneDistortion(
|
||||
const uint8_t* src, size_t src_stride,
|
||||
const uint8_t* ref, size_t ref_stride, int width, int height, size_t x_step,
|
||||
int type, // 0 = PSNR, 1 = SSIM, 2 = LSIM
|
||||
float* distortion, float* result);
|
||||
|
||||
// Compute PSNR, SSIM or LSIM distortion metric between two pictures. Results
|
||||
// are in dB, stored in result[] in the B/G/R/A/All order. The distortion is
|
||||
// always performed using ARGB samples. Hence if the input is YUV(A), the
|
||||
// picture will be internally converted to ARGB (just for the measurement).
|
||||
// Warning: this function is rather CPU-intensive.
|
||||
WEBP_EXTERN int WebPPictureDistortion(
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureDistortion(
|
||||
const WebPPicture* src, const WebPPicture* ref,
|
||||
int metric_type, // 0 = PSNR, 1 = SSIM, 2 = LSIM
|
||||
float result[5]);
|
||||
@ -428,8 +431,8 @@ WEBP_EXTERN int WebPPictureDistortion(
|
||||
// must be fully be comprised inside the 'src' source picture. If the source
|
||||
// picture uses the YUV420 colorspace, the top and left coordinates will be
|
||||
// snapped to even values.
|
||||
WEBP_EXTERN int WebPPictureCrop(WebPPicture* picture,
|
||||
int left, int top, int width, int height);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureCrop(
|
||||
WebPPicture* picture, int left, int top, int width, int height);
|
||||
|
||||
// Extracts a view from 'src' picture into 'dst'. The rectangle for the view
|
||||
// is defined by the top-left corner pixel coordinates (left, top) as well
|
||||
@ -442,9 +445,9 @@ WEBP_EXTERN int WebPPictureCrop(WebPPicture* picture,
|
||||
// with WebPPictureInit() if it is different from 'src', since its content will
|
||||
// be overwritten.
|
||||
// Returns false in case of invalid parameters.
|
||||
WEBP_EXTERN int WebPPictureView(const WebPPicture* src,
|
||||
int left, int top, int width, int height,
|
||||
WebPPicture* dst);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureView(
|
||||
const WebPPicture* src, int left, int top, int width, int height,
|
||||
WebPPicture* dst);
|
||||
|
||||
// Returns true if the 'picture' is actually a view and therefore does
|
||||
// not own the memory for pixels.
|
||||
@ -455,29 +458,30 @@ WEBP_EXTERN int WebPPictureIsView(const WebPPicture* picture);
|
||||
// dimension will be calculated preserving the aspect ratio.
|
||||
// No gamma correction is applied.
|
||||
// Returns false in case of error (invalid parameter or insufficient memory).
|
||||
WEBP_EXTERN int WebPPictureRescale(WebPPicture* picture, int width, int height);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureRescale(WebPPicture* picture,
|
||||
int width, int height);
|
||||
|
||||
// Colorspace conversion function to import RGB samples.
|
||||
// Previous buffer will be free'd, if any.
|
||||
// *rgb buffer should have a size of at least height * rgb_stride.
|
||||
// Returns false in case of memory error.
|
||||
WEBP_EXTERN int WebPPictureImportRGB(
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureImportRGB(
|
||||
WebPPicture* picture, const uint8_t* rgb, int rgb_stride);
|
||||
// Same, but for RGBA buffer.
|
||||
WEBP_EXTERN int WebPPictureImportRGBA(
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureImportRGBA(
|
||||
WebPPicture* picture, const uint8_t* rgba, int rgba_stride);
|
||||
// Same, but for RGBA buffer. Imports the RGB direct from the 32-bit format
|
||||
// input buffer ignoring the alpha channel. Avoids needing to copy the data
|
||||
// to a temporary 24-bit RGB buffer to import the RGB only.
|
||||
WEBP_EXTERN int WebPPictureImportRGBX(
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureImportRGBX(
|
||||
WebPPicture* picture, const uint8_t* rgbx, int rgbx_stride);
|
||||
|
||||
// Variants of the above, but taking BGR(A|X) input.
|
||||
WEBP_EXTERN int WebPPictureImportBGR(
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureImportBGR(
|
||||
WebPPicture* picture, const uint8_t* bgr, int bgr_stride);
|
||||
WEBP_EXTERN int WebPPictureImportBGRA(
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureImportBGRA(
|
||||
WebPPicture* picture, const uint8_t* bgra, int bgra_stride);
|
||||
WEBP_EXTERN int WebPPictureImportBGRX(
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureImportBGRX(
|
||||
WebPPicture* picture, const uint8_t* bgrx, int bgrx_stride);
|
||||
|
||||
// Converts picture->argb data to the YUV420A format. The 'colorspace'
|
||||
@ -486,24 +490,24 @@ WEBP_EXTERN int WebPPictureImportBGRX(
|
||||
// non-opaque transparent values is detected, and 'colorspace' will be
|
||||
// adjusted accordingly. Note that this method is lossy.
|
||||
// Returns false in case of error.
|
||||
WEBP_EXTERN int WebPPictureARGBToYUVA(WebPPicture* picture,
|
||||
WebPEncCSP /*colorspace = WEBP_YUV420*/);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureARGBToYUVA(
|
||||
WebPPicture* picture, WebPEncCSP /*colorspace = WEBP_YUV420*/);
|
||||
|
||||
// Same as WebPPictureARGBToYUVA(), but the conversion is done using
|
||||
// pseudo-random dithering with a strength 'dithering' between
|
||||
// 0.0 (no dithering) and 1.0 (maximum dithering). This is useful
|
||||
// for photographic picture.
|
||||
WEBP_EXTERN int WebPPictureARGBToYUVADithered(
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureARGBToYUVADithered(
|
||||
WebPPicture* picture, WebPEncCSP colorspace, float dithering);
|
||||
|
||||
// Performs 'sharp' RGBA->YUVA420 downsampling and colorspace conversion.
|
||||
// Performs 'sharp' RGBA->YUVA420 downsampling and colorspace conversion
|
||||
// Downsampling is handled with extra care in case of color clipping. This
|
||||
// method is roughly 2x slower than WebPPictureARGBToYUVA() but produces better
|
||||
// and sharper YUV representation.
|
||||
// Returns false in case of error.
|
||||
WEBP_EXTERN int WebPPictureSharpARGBToYUVA(WebPPicture* picture);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureSharpARGBToYUVA(WebPPicture* picture);
|
||||
// kept for backward compatibility:
|
||||
WEBP_EXTERN int WebPPictureSmartARGBToYUVA(WebPPicture* picture);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureSmartARGBToYUVA(WebPPicture* picture);
|
||||
|
||||
// Converts picture->yuv to picture->argb and sets picture->use_argb to true.
|
||||
// The input format must be YUV_420 or YUV_420A. The conversion from YUV420 to
|
||||
@ -511,7 +515,7 @@ WEBP_EXTERN int WebPPictureSmartARGBToYUVA(WebPPicture* picture);
|
||||
// Note that the use of this colorspace is discouraged if one has access to the
|
||||
// raw ARGB samples, since using YUV420 is comparatively lossy.
|
||||
// Returns false in case of error.
|
||||
WEBP_EXTERN int WebPPictureYUVAToARGB(WebPPicture* picture);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPPictureYUVAToARGB(WebPPicture* picture);
|
||||
|
||||
// Helper function: given a width x height plane of RGBA or YUV(A) samples
|
||||
// clean-up or smoothen the YUV or RGB samples under fully transparent area,
|
||||
@ -541,7 +545,8 @@ WEBP_EXTERN void WebPBlendAlpha(WebPPicture* picture, uint32_t background_rgb);
|
||||
// the former for lossy encoding, and the latter for lossless encoding
|
||||
// (when config.lossless is true). Automatic conversion from one format to
|
||||
// another is provided but they both incur some loss.
|
||||
WEBP_EXTERN int WebPEncode(const WebPConfig* config, WebPPicture* picture);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPEncode(const WebPConfig* config,
|
||||
WebPPicture* picture);
|
||||
|
||||
//------------------------------------------------------------------------------
|
||||
|
||||
|
||||
@ -16,6 +16,7 @@
|
||||
#define WEBP_WEBP_MUX_H_
|
||||
|
||||
#include "./mux_types.h"
|
||||
#include "./types.h"
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C" {
|
||||
@ -70,7 +71,7 @@ typedef struct WebPMuxAnimParams WebPMuxAnimParams;
|
||||
typedef struct WebPAnimEncoderOptions WebPAnimEncoderOptions;
|
||||
|
||||
// Error codes
|
||||
typedef enum WebPMuxError {
|
||||
typedef enum WEBP_NODISCARD WebPMuxError {
|
||||
WEBP_MUX_OK = 1,
|
||||
WEBP_MUX_NOT_FOUND = 0,
|
||||
WEBP_MUX_INVALID_ARGUMENT = -1,
|
||||
@ -104,13 +105,13 @@ WEBP_EXTERN int WebPGetMuxVersion(void);
|
||||
// Life of a Mux object
|
||||
|
||||
// Internal, version-checked, entry point
|
||||
WEBP_EXTERN WebPMux* WebPNewInternal(int);
|
||||
WEBP_NODISCARD WEBP_EXTERN WebPMux* WebPNewInternal(int);
|
||||
|
||||
// Creates an empty mux object.
|
||||
// Returns:
|
||||
// A pointer to the newly created empty mux object.
|
||||
// Or NULL in case of memory error.
|
||||
static WEBP_INLINE WebPMux* WebPMuxNew(void) {
|
||||
WEBP_NODISCARD static WEBP_INLINE WebPMux* WebPMuxNew(void) {
|
||||
return WebPNewInternal(WEBP_MUX_ABI_VERSION);
|
||||
}
|
||||
|
||||
@ -123,7 +124,8 @@ WEBP_EXTERN void WebPMuxDelete(WebPMux* mux);
|
||||
// Mux creation.
|
||||
|
||||
// Internal, version-checked, entry point
|
||||
WEBP_EXTERN WebPMux* WebPMuxCreateInternal(const WebPData*, int, int);
|
||||
WEBP_NODISCARD WEBP_EXTERN WebPMux* WebPMuxCreateInternal(const WebPData*, int,
|
||||
int);
|
||||
|
||||
// Creates a mux object from raw data given in WebP RIFF format.
|
||||
// Parameters:
|
||||
@ -133,8 +135,8 @@ WEBP_EXTERN WebPMux* WebPMuxCreateInternal(const WebPData*, int, int);
|
||||
// Returns:
|
||||
// A pointer to the mux object created from given data - on success.
|
||||
// NULL - In case of invalid data or memory error.
|
||||
static WEBP_INLINE WebPMux* WebPMuxCreate(const WebPData* bitstream,
|
||||
int copy_data) {
|
||||
WEBP_NODISCARD static WEBP_INLINE WebPMux* WebPMuxCreate(
|
||||
const WebPData* bitstream, int copy_data) {
|
||||
return WebPMuxCreateInternal(bitstream, copy_data, WEBP_MUX_ABI_VERSION);
|
||||
}
|
||||
|
||||
@ -449,7 +451,7 @@ WEBP_EXTERN int WebPAnimEncoderOptionsInitInternal(
|
||||
// structure before modification. Returns false in case of version mismatch.
|
||||
// WebPAnimEncoderOptionsInit() must have succeeded before using the
|
||||
// 'enc_options' object.
|
||||
static WEBP_INLINE int WebPAnimEncoderOptionsInit(
|
||||
WEBP_NODISCARD static WEBP_INLINE int WebPAnimEncoderOptionsInit(
|
||||
WebPAnimEncoderOptions* enc_options) {
|
||||
return WebPAnimEncoderOptionsInitInternal(enc_options, WEBP_MUX_ABI_VERSION);
|
||||
}
|
||||
@ -490,7 +492,7 @@ static WEBP_INLINE WebPAnimEncoder* WebPAnimEncoderNew(
|
||||
// Returns:
|
||||
// On error, returns false and frame->error_code is set appropriately.
|
||||
// Otherwise, returns true.
|
||||
WEBP_EXTERN int WebPAnimEncoderAdd(
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPAnimEncoderAdd(
|
||||
WebPAnimEncoder* enc, struct WebPPicture* frame, int timestamp_ms,
|
||||
const struct WebPConfig* config);
|
||||
|
||||
@ -503,8 +505,8 @@ WEBP_EXTERN int WebPAnimEncoderAdd(
|
||||
// webp_data - (out) generated WebP bitstream.
|
||||
// Returns:
|
||||
// True on success.
|
||||
WEBP_EXTERN int WebPAnimEncoderAssemble(WebPAnimEncoder* enc,
|
||||
WebPData* webp_data);
|
||||
WEBP_NODISCARD WEBP_EXTERN int WebPAnimEncoderAssemble(WebPAnimEncoder* enc,
|
||||
WebPData* webp_data);
|
||||
|
||||
// Get error string corresponding to the most recent call using 'enc'. The
|
||||
// returned string is owned by 'enc' and is valid only until the next call to
|
||||
|
||||
@ -79,7 +79,8 @@ static WEBP_INLINE void WebPDataClear(WebPData* webp_data) {
|
||||
|
||||
// Allocates necessary storage for 'dst' and copies the contents of 'src'.
|
||||
// Returns true on success.
|
||||
static WEBP_INLINE int WebPDataCopy(const WebPData* src, WebPData* dst) {
|
||||
WEBP_NODISCARD static WEBP_INLINE int WebPDataCopy(const WebPData* src,
|
||||
WebPData* dst) {
|
||||
if (src == NULL || dst == NULL) return 0;
|
||||
WebPDataInit(dst);
|
||||
if (src->bytes != NULL && src->size != 0) {
|
||||
|
||||
@ -36,6 +36,23 @@ typedef long long int int64_t;
|
||||
#define WEBP_INLINE __forceinline
|
||||
#endif /* _MSC_VER */
|
||||
|
||||
#if defined(WEBP_ENABLE_NODISCARD) || \
|
||||
(defined(__cplusplus) && __cplusplus >= 201700L) || \
|
||||
(defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L)
|
||||
#define WEBP_NODISCARD [[nodiscard]]
|
||||
#else
|
||||
// gcc's __has_attribute does not work for enums.
|
||||
#if defined(__clang__) && defined(__has_attribute)
|
||||
#if __has_attribute(warn_unused_result)
|
||||
#define WEBP_NODISCARD __attribute__((warn_unused_result))
|
||||
#else
|
||||
#define WEBP_NODISCARD
|
||||
#endif
|
||||
#else
|
||||
#define WEBP_NODISCARD
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#ifndef WEBP_EXTERN
|
||||
// This explicitly marks library functions and allows for changing the
|
||||
// signature for e.g., Windows DLL builds.
|
||||
@ -60,7 +77,7 @@ extern "C" {
|
||||
// Allocates 'size' bytes of memory. Returns NULL upon error. Memory
|
||||
// must be deallocated by calling WebPFree(). This function is made available
|
||||
// by the core 'libwebp' library.
|
||||
WEBP_EXTERN void* WebPMalloc(size_t size);
|
||||
WEBP_NODISCARD WEBP_EXTERN void* WebPMalloc(size_t size);
|
||||
|
||||
// Releases memory returned by the WebPDecode*() functions (from decode.h).
|
||||
WEBP_EXTERN void WebPFree(void* ptr);
|
||||
|
||||
Reference in New Issue
Block a user