2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
12 * \brief Describes the vpx image descriptor and associated operations
15 #ifndef VPX_VPX_VPX_IMAGE_H_
16 #define VPX_VPX_VPX_IMAGE_H_
22 /*!\brief Current ABI version number
25 * If this file is altered in any way that changes the ABI, this value
26 * must be bumped. Examples include, but are not limited to, changing
27 * types, removing or reassigning enums, adding/removing/rearranging
28 * fields to structures
30 #define VPX_IMAGE_ABI_VERSION (5) /**<\hideinitializer*/
32 #define VPX_IMG_FMT_PLANAR 0x100 /**< Image is a planar format. */
33 #define VPX_IMG_FMT_UV_FLIP 0x200 /**< V plane precedes U in memory. */
34 #define VPX_IMG_FMT_HAS_ALPHA 0x400 /**< Image has an alpha channel. */
35 #define VPX_IMG_FMT_HIGHBITDEPTH 0x800 /**< Image uses 16bit framebuffer. */
37 /*!\brief List of supported image formats */
38 typedef enum vpx_img_fmt {
41 VPX_IMG_FMT_PLANAR | VPX_IMG_FMT_UV_FLIP | 1, /**< planar YVU */
42 VPX_IMG_FMT_I420 = VPX_IMG_FMT_PLANAR | 2,
43 VPX_IMG_FMT_I422 = VPX_IMG_FMT_PLANAR | 5,
44 VPX_IMG_FMT_I444 = VPX_IMG_FMT_PLANAR | 6,
45 VPX_IMG_FMT_I440 = VPX_IMG_FMT_PLANAR | 7,
46 VPX_IMG_FMT_NV12 = VPX_IMG_FMT_PLANAR | 9,
47 VPX_IMG_FMT_I42016 = VPX_IMG_FMT_I420 | VPX_IMG_FMT_HIGHBITDEPTH,
48 VPX_IMG_FMT_I42216 = VPX_IMG_FMT_I422 | VPX_IMG_FMT_HIGHBITDEPTH,
49 VPX_IMG_FMT_I44416 = VPX_IMG_FMT_I444 | VPX_IMG_FMT_HIGHBITDEPTH,
50 VPX_IMG_FMT_I44016 = VPX_IMG_FMT_I440 | VPX_IMG_FMT_HIGHBITDEPTH
51 } vpx_img_fmt_t; /**< alias for enum vpx_img_fmt */
53 /*!\brief List of supported color spaces */
54 typedef enum vpx_color_space {
55 VPX_CS_UNKNOWN = 0, /**< Unknown */
56 VPX_CS_BT_601 = 1, /**< BT.601 */
57 VPX_CS_BT_709 = 2, /**< BT.709 */
58 VPX_CS_SMPTE_170 = 3, /**< SMPTE.170 */
59 VPX_CS_SMPTE_240 = 4, /**< SMPTE.240 */
60 VPX_CS_BT_2020 = 5, /**< BT.2020 */
61 VPX_CS_RESERVED = 6, /**< Reserved */
62 VPX_CS_SRGB = 7 /**< sRGB */
63 } vpx_color_space_t; /**< alias for enum vpx_color_space */
65 /*!\brief List of supported color range */
66 typedef enum vpx_color_range {
67 VPX_CR_STUDIO_RANGE = 0, /**< Y [16..235], UV [16..240] */
68 VPX_CR_FULL_RANGE = 1 /**< YUV/RGB [0..255] */
69 } vpx_color_range_t; /**< alias for enum vpx_color_range */
71 /**\brief Image Descriptor */
72 typedef struct vpx_image {
73 vpx_img_fmt_t fmt; /**< Image Format */
74 vpx_color_space_t cs; /**< Color Space */
75 vpx_color_range_t range; /**< Color Range */
77 /* Image storage dimensions */
78 unsigned int w; /**< Stored image width */
79 unsigned int h; /**< Stored image height */
80 unsigned int bit_depth; /**< Stored image bit-depth */
82 /* Image display dimensions */
83 unsigned int d_w; /**< Displayed image width */
84 unsigned int d_h; /**< Displayed image height */
86 /* Image intended rendering dimensions */
87 unsigned int r_w; /**< Intended rendering image width */
88 unsigned int r_h; /**< Intended rendering image height */
90 /* Chroma subsampling info */
91 unsigned int x_chroma_shift; /**< subsampling order, X */
92 unsigned int y_chroma_shift; /**< subsampling order, Y */
94 /* Image data pointers. */
95 #define VPX_PLANE_PACKED 0 /**< To be used for all packed formats */
96 #define VPX_PLANE_Y 0 /**< Y (Luminance) plane */
97 #define VPX_PLANE_U 1 /**< U (Chroma) plane */
98 #define VPX_PLANE_V 2 /**< V (Chroma) plane */
99 #define VPX_PLANE_ALPHA 3 /**< A (Transparency) plane */
100 unsigned char *planes[4]; /**< pointer to the top left pixel for each plane */
101 int stride[4]; /**< stride between rows for each plane */
103 int bps; /**< bits per sample (for packed formats) */
105 /*!\brief The following member may be set by the application to associate
106 * data with this image.
110 /* The following members should be treated as private. */
111 unsigned char *img_data; /**< private */
112 int img_data_owner; /**< private */
113 int self_allocd; /**< private */
115 void *fb_priv; /**< Frame buffer data associated with the image. */
116 } vpx_image_t; /**< alias for struct vpx_image */
118 /**\brief Representation of a rectangle on a surface */
119 typedef struct vpx_image_rect {
120 unsigned int x; /**< leftmost column */
121 unsigned int y; /**< topmost row */
122 unsigned int w; /**< width */
123 unsigned int h; /**< height */
124 } vpx_image_rect_t; /**< alias for struct vpx_image_rect */
126 /*!\brief Open a descriptor, allocating storage for the underlying image
128 * Returns a descriptor for storing an image of the given format. The
129 * storage for the descriptor is allocated on the heap.
131 * \param[in] img Pointer to storage for descriptor. If this parameter
132 * is NULL, the storage for the descriptor will be
133 * allocated on the heap.
134 * \param[in] fmt Format for the image
135 * \param[in] d_w Width of the image
136 * \param[in] d_h Height of the image
137 * \param[in] align Alignment, in bytes, of the image buffer and
138 * each row in the image(stride).
140 * \return Returns a pointer to the initialized image descriptor. If the img
141 * parameter is non-null, the value of the img parameter will be
144 vpx_image_t *vpx_img_alloc(vpx_image_t *img, vpx_img_fmt_t fmt,
145 unsigned int d_w, unsigned int d_h,
148 /*!\brief Open a descriptor, using existing storage for the underlying image
150 * Returns a descriptor for storing an image of the given format. The
151 * storage for descriptor has been allocated elsewhere, and a descriptor is
152 * desired to "wrap" that storage.
154 * \param[in] img Pointer to storage for descriptor. If this
155 * parameter is NULL, the storage for the descriptor
156 * will be allocated on the heap.
157 * \param[in] fmt Format for the image
158 * \param[in] d_w Width of the image
159 * \param[in] d_h Height of the image
160 * \param[in] stride_align Alignment, in bytes, of each row in the image.
161 * \param[in] img_data Storage to use for the image
163 * \return Returns a pointer to the initialized image descriptor. If the img
164 * parameter is non-null, the value of the img parameter will be
167 vpx_image_t *vpx_img_wrap(vpx_image_t *img, vpx_img_fmt_t fmt, unsigned int d_w,
168 unsigned int d_h, unsigned int stride_align,
169 unsigned char *img_data);
171 /*!\brief Set the rectangle identifying the displayed portion of the image
173 * Updates the displayed rectangle (aka viewport) on the image surface to
174 * match the specified coordinates and size. Specifically, sets img->d_w,
175 * img->d_h, and elements of the img->planes[] array.
177 * \param[in] img Image descriptor
178 * \param[in] x leftmost column
179 * \param[in] y topmost row
181 * \param[in] h height
183 * \return 0 if the requested rectangle is valid, nonzero (-1) otherwise.
185 int vpx_img_set_rect(vpx_image_t *img, unsigned int x, unsigned int y,
186 unsigned int w, unsigned int h);
188 /*!\brief Flip the image vertically (top for bottom)
190 * Adjusts the image descriptor's pointers and strides to make the image
191 * be referenced upside-down.
193 * \param[in] img Image descriptor
195 void vpx_img_flip(vpx_image_t *img);
197 /*!\brief Close an image descriptor
199 * Frees all allocated storage associated with an image descriptor.
201 * \param[in] img Image descriptor
203 void vpx_img_free(vpx_image_t *img);
209 #endif // VPX_VPX_VPX_IMAGE_H_