209 lines
7.9 KiB
C
209 lines
7.9 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. 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 LICENSE 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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/*!\file
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* \brief Describes the vpx image descriptor and associated operations
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*
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*/
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#ifndef VPX_VPX_VPX_IMAGE_H_
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#define VPX_VPX_VPX_IMAGE_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*!\brief Current ABI version number
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*
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* \internal
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* If this file is altered in any way that changes the ABI, this value
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* must be bumped. Examples include, but are not limited to, changing
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* types, removing or reassigning enums, adding/removing/rearranging
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* fields to structures
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*/
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#define VPX_IMAGE_ABI_VERSION (5) /**<\hideinitializer*/
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#define VPX_IMG_FMT_PLANAR 0x100 /**< Image is a planar format. */
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#define VPX_IMG_FMT_UV_FLIP 0x200 /**< V plane precedes U in memory. */
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#define VPX_IMG_FMT_HAS_ALPHA 0x400 /**< Image has an alpha channel. */
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#define VPX_IMG_FMT_HIGHBITDEPTH 0x800 /**< Image uses 16bit framebuffer. */
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/*!\brief List of supported image formats */
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typedef enum vpx_img_fmt {
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VPX_IMG_FMT_NONE,
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VPX_IMG_FMT_YV12 =
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VPX_IMG_FMT_PLANAR | VPX_IMG_FMT_UV_FLIP | 1, /**< planar YVU */
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VPX_IMG_FMT_I420 = VPX_IMG_FMT_PLANAR | 2,
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VPX_IMG_FMT_I422 = VPX_IMG_FMT_PLANAR | 5,
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VPX_IMG_FMT_I444 = VPX_IMG_FMT_PLANAR | 6,
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VPX_IMG_FMT_I440 = VPX_IMG_FMT_PLANAR | 7,
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VPX_IMG_FMT_NV12 = VPX_IMG_FMT_PLANAR | 9,
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VPX_IMG_FMT_I42016 = VPX_IMG_FMT_I420 | VPX_IMG_FMT_HIGHBITDEPTH,
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VPX_IMG_FMT_I42216 = VPX_IMG_FMT_I422 | VPX_IMG_FMT_HIGHBITDEPTH,
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VPX_IMG_FMT_I44416 = VPX_IMG_FMT_I444 | VPX_IMG_FMT_HIGHBITDEPTH,
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VPX_IMG_FMT_I44016 = VPX_IMG_FMT_I440 | VPX_IMG_FMT_HIGHBITDEPTH
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} vpx_img_fmt_t; /**< alias for enum vpx_img_fmt */
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/*!\brief List of supported color spaces */
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typedef enum vpx_color_space {
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VPX_CS_UNKNOWN = 0, /**< Unknown */
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VPX_CS_BT_601 = 1, /**< BT.601 */
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VPX_CS_BT_709 = 2, /**< BT.709 */
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VPX_CS_SMPTE_170 = 3, /**< SMPTE.170 */
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VPX_CS_SMPTE_240 = 4, /**< SMPTE.240 */
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VPX_CS_BT_2020 = 5, /**< BT.2020 */
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VPX_CS_RESERVED = 6, /**< Reserved */
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VPX_CS_SRGB = 7 /**< sRGB */
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} vpx_color_space_t; /**< alias for enum vpx_color_space */
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/*!\brief List of supported color range */
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typedef enum vpx_color_range {
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VPX_CR_STUDIO_RANGE = 0, /**< Y [16..235], UV [16..240] */
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VPX_CR_FULL_RANGE = 1 /**< YUV/RGB [0..255] */
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} vpx_color_range_t; /**< alias for enum vpx_color_range */
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/**\brief Image Descriptor */
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typedef struct vpx_image {
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vpx_img_fmt_t fmt; /**< Image Format */
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vpx_color_space_t cs; /**< Color Space */
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vpx_color_range_t range; /**< Color Range */
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/* Image storage dimensions */
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unsigned int w; /**< Stored image width */
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unsigned int h; /**< Stored image height */
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unsigned int bit_depth; /**< Stored image bit-depth */
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/* Image display dimensions */
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unsigned int d_w; /**< Displayed image width */
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unsigned int d_h; /**< Displayed image height */
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/* Image intended rendering dimensions */
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unsigned int r_w; /**< Intended rendering image width */
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unsigned int r_h; /**< Intended rendering image height */
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/* Chroma subsampling info */
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unsigned int x_chroma_shift; /**< subsampling order, X */
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unsigned int y_chroma_shift; /**< subsampling order, Y */
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/* Image data pointers. */
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#define VPX_PLANE_PACKED 0 /**< To be used for all packed formats */
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#define VPX_PLANE_Y 0 /**< Y (Luminance) plane */
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#define VPX_PLANE_U 1 /**< U (Chroma) plane */
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#define VPX_PLANE_V 2 /**< V (Chroma) plane */
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#define VPX_PLANE_ALPHA 3 /**< A (Transparency) plane */
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unsigned char *planes[4]; /**< pointer to the top left pixel for each plane */
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int stride[4]; /**< stride between rows for each plane */
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int bps; /**< bits per sample (for packed formats) */
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/*!\brief The following member may be set by the application to associate
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* data with this image.
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*/
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void *user_priv;
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/* The following members should be treated as private. */
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unsigned char *img_data; /**< private */
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int img_data_owner; /**< private */
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int self_allocd; /**< private */
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void *fb_priv; /**< Frame buffer data associated with the image. */
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} vpx_image_t; /**< alias for struct vpx_image */
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/**\brief Representation of a rectangle on a surface */
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typedef struct vpx_image_rect {
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unsigned int x; /**< leftmost column */
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unsigned int y; /**< topmost row */
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unsigned int w; /**< width */
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unsigned int h; /**< height */
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} vpx_image_rect_t; /**< alias for struct vpx_image_rect */
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/*!\brief Open a descriptor, allocating storage for the underlying image
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*
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* Returns a descriptor for storing an image of the given format. The
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* storage for the descriptor is allocated on the heap.
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*
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* \param[in] img Pointer to storage for descriptor. If this parameter
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* is NULL, the storage for the descriptor will be
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* allocated on the heap.
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* \param[in] fmt Format for the image
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* \param[in] d_w Width of the image
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* \param[in] d_h Height of the image
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* \param[in] align Alignment, in bytes, of the image buffer and
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* each row in the image(stride).
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*
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* \return Returns a pointer to the initialized image descriptor. If the img
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* parameter is non-null, the value of the img parameter will be
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* returned.
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*/
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vpx_image_t *vpx_img_alloc(vpx_image_t *img, vpx_img_fmt_t fmt,
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unsigned int d_w, unsigned int d_h,
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unsigned int align);
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/*!\brief Open a descriptor, using existing storage for the underlying image
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*
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* Returns a descriptor for storing an image of the given format. The
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* storage for descriptor has been allocated elsewhere, and a descriptor is
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* desired to "wrap" that storage.
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*
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* \param[in] img Pointer to storage for descriptor. If this
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* parameter is NULL, the storage for the descriptor
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* will be allocated on the heap.
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* \param[in] fmt Format for the image
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* \param[in] d_w Width of the image
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* \param[in] d_h Height of the image
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* \param[in] stride_align Alignment, in bytes, of each row in the image.
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* \param[in] img_data Storage to use for the image
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*
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* \return Returns a pointer to the initialized image descriptor. If the img
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* parameter is non-null, the value of the img parameter will be
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* returned.
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*/
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vpx_image_t *vpx_img_wrap(vpx_image_t *img, vpx_img_fmt_t fmt, unsigned int d_w,
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unsigned int d_h, unsigned int stride_align,
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unsigned char *img_data);
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/*!\brief Set the rectangle identifying the displayed portion of the image
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*
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* Updates the displayed rectangle (aka viewport) on the image surface to
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* match the specified coordinates and size.
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*
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* \param[in] img Image descriptor
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* \param[in] x leftmost column
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* \param[in] y topmost row
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* \param[in] w width
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* \param[in] h height
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*
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* \return 0 if the requested rectangle is valid, nonzero otherwise.
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*/
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int vpx_img_set_rect(vpx_image_t *img, unsigned int x, unsigned int y,
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unsigned int w, unsigned int h);
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/*!\brief Flip the image vertically (top for bottom)
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*
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* Adjusts the image descriptor's pointers and strides to make the image
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* be referenced upside-down.
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*
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* \param[in] img Image descriptor
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*/
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void vpx_img_flip(vpx_image_t *img);
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/*!\brief Close an image descriptor
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*
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* Frees all allocated storage associated with an image descriptor.
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*
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* \param[in] img Image descriptor
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*/
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void vpx_img_free(vpx_image_t *img);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VPX_VPX_VPX_IMAGE_H_
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