vpx/vpx_image.h

   1 /*
   2  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
   3  *
   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.
   9  */
  10
  11
  12 /*!\file
  13  * \brief Describes the vpx image descriptor and associated operations
  14  *
  15  */
  16 #ifndef VPX_VPX_IMAGE_H_
  17 #define VPX_VPX_IMAGE_H_
  18
  19 #ifdef __cplusplus
  20 extern "C" {
  21 #endif
  22
  23   /*!\brief Current ABI version number
  24    *
  25    * \internal
  26    * If this file is altered in any way that changes the ABI, this value
  27    * must be bumped.  Examples include, but are not limited to, changing
  28    * types, removing or reassigning enums, adding/removing/rearranging
  29    * fields to structures
  30    */
  31 #define VPX_IMAGE_ABI_VERSION (3) /**<\hideinitializer*/
  32
  33
  34 #define VPX_IMG_FMT_PLANAR     0x100  /**< Image is a planar format. */
  35 #define VPX_IMG_FMT_UV_FLIP    0x200  /**< V plane precedes U in memory. */
  36 #define VPX_IMG_FMT_HAS_ALPHA  0x400  /**< Image has an alpha channel. */
  37 #define VPX_IMG_FMT_HIGHBITDEPTH 0x800  /**< Image uses 16bit framebuffer. */
  38
  39   /*!\brief List of supported image formats */
  40   typedef enum vpx_img_fmt {
  41     VPX_IMG_FMT_NONE,
  42     VPX_IMG_FMT_RGB24,   /**< 24 bit per pixel packed RGB */
  43     VPX_IMG_FMT_RGB32,   /**< 32 bit per pixel packed 0RGB */
  44     VPX_IMG_FMT_RGB565,  /**< 16 bit per pixel, 565 */
  45     VPX_IMG_FMT_RGB555,  /**< 16 bit per pixel, 555 */
  46     VPX_IMG_FMT_UYVY,    /**< UYVY packed YUV */
  47     VPX_IMG_FMT_YUY2,    /**< YUYV packed YUV */
  48     VPX_IMG_FMT_YVYU,    /**< YVYU packed YUV */
  49     VPX_IMG_FMT_BGR24,   /**< 24 bit per pixel packed BGR */
  50     VPX_IMG_FMT_RGB32_LE, /**< 32 bit packed BGR0 */
  51     VPX_IMG_FMT_ARGB,     /**< 32 bit packed ARGB, alpha=255 */
  52     VPX_IMG_FMT_ARGB_LE,  /**< 32 bit packed BGRA, alpha=255 */
  53     VPX_IMG_FMT_RGB565_LE,  /**< 16 bit per pixel, gggbbbbb rrrrrggg */
  54     VPX_IMG_FMT_RGB555_LE,  /**< 16 bit per pixel, gggbbbbb 0rrrrrgg */
  55     VPX_IMG_FMT_YV12    = VPX_IMG_FMT_PLANAR | VPX_IMG_FMT_UV_FLIP | 1, /**< planar YVU */
  56     VPX_IMG_FMT_I420    = VPX_IMG_FMT_PLANAR | 2,
  57     VPX_IMG_FMT_VPXYV12 = VPX_IMG_FMT_PLANAR | VPX_IMG_FMT_UV_FLIP | 3, /** < planar 4:2:0 format with vpx color space */
  58     VPX_IMG_FMT_VPXI420 = VPX_IMG_FMT_PLANAR | 4,
  59     VPX_IMG_FMT_I422    = VPX_IMG_FMT_PLANAR | 5,
  60     VPX_IMG_FMT_I444    = VPX_IMG_FMT_PLANAR | 6,
  61     VPX_IMG_FMT_I440    = VPX_IMG_FMT_PLANAR | 7,
  62     VPX_IMG_FMT_444A    = VPX_IMG_FMT_PLANAR | VPX_IMG_FMT_HAS_ALPHA | 6,
  63     VPX_IMG_FMT_I42016    = VPX_IMG_FMT_I420 | VPX_IMG_FMT_HIGHBITDEPTH,
  64     VPX_IMG_FMT_I42216    = VPX_IMG_FMT_I422 | VPX_IMG_FMT_HIGHBITDEPTH,
  65     VPX_IMG_FMT_I44416    = VPX_IMG_FMT_I444 | VPX_IMG_FMT_HIGHBITDEPTH,
  66     VPX_IMG_FMT_I44016    = VPX_IMG_FMT_I440 | VPX_IMG_FMT_HIGHBITDEPTH
  67   } vpx_img_fmt_t; /**< alias for enum vpx_img_fmt */
  68
  69   /*!\brief List of supported color spaces */
  70   typedef enum vpx_color_space {
  71     VPX_CS_UNKNOWN    = 0,  /**< Unknown */
  72     VPX_CS_BT_601     = 1,  /**< BT.601 */
  73     VPX_CS_BT_709     = 2,  /**< BT.709 */
  74     VPX_CS_SMPTE_170  = 3,  /**< SMPTE.170 */
  75     VPX_CS_SMPTE_240  = 4,  /**< SMPTE.240 */
  76     VPX_CS_BT_2020    = 5,  /**< BT.2020 */
  77     VPX_CS_RESERVED   = 6,  /**< Reserved */
  78     VPX_CS_SRGB       = 7   /**< sRGB */
  79   } vpx_color_space_t; /**< alias for enum vpx_color_space */
  80
  81   /**\brief Image Descriptor */
  82   typedef struct vpx_image {
  83     vpx_img_fmt_t fmt; /**< Image Format */
  84     vpx_color_space_t cs; /**< Color Space */
  85
  86     /* Image storage dimensions */
  87     unsigned int  w;           /**< Stored image width */
  88     unsigned int  h;           /**< Stored image height */
  89     unsigned int  bit_depth;   /**< Stored image bit-depth */
  90
  91     /* Image display dimensions */
  92     unsigned int  d_w;   /**< Displayed image width */
  93     unsigned int  d_h;   /**< Displayed image height */
  94
  95     /* Chroma subsampling info */
  96     unsigned int  x_chroma_shift;   /**< subsampling order, X */
  97     unsigned int  y_chroma_shift;   /**< subsampling order, Y */
  98
  99     /* Image data pointers. */
 100 #define VPX_PLANE_PACKED 0   /**< To be used for all packed formats */
 101 #define VPX_PLANE_Y      0   /**< Y (Luminance) plane */
 102 #define VPX_PLANE_U      1   /**< U (Chroma) plane */
 103 #define VPX_PLANE_V      2   /**< V (Chroma) plane */
 104 #define VPX_PLANE_ALPHA  3   /**< A (Transparency) plane */
 105     unsigned char *planes[4];  /**< pointer to the top left pixel for each plane */
 106     int      stride[4];  /**< stride between rows for each plane */
 107
 108     int     bps; /**< bits per sample (for packed formats) */
 109
 110     /* The following member may be set by the application to associate data
 111      * with this image.
 112      */
 113     void    *user_priv; /**< may be set by the application to associate data
 114                          *   with this image. */
 115
 116     /* The following members should be treated as private. */
 117     unsigned char *img_data;       /**< private */
 118     int      img_data_owner; /**< private */
 119     int      self_allocd;    /**< private */
 120
 121     void    *fb_priv; /**< Frame buffer data associated with the image. */
 122   } vpx_image_t; /**< alias for struct vpx_image */
 123
 124   /**\brief Representation of a rectangle on a surface */
 125   typedef struct vpx_image_rect {
 126     unsigned int x; /**< leftmost column */
 127     unsigned int y; /**< topmost row */
 128     unsigned int w; /**< width */
 129     unsigned int h; /**< height */
 130   } vpx_image_rect_t; /**< alias for struct vpx_image_rect */
 131
 132   /*!\brief Open a descriptor, allocating storage for the underlying image
 133    *
 134    * Returns a descriptor for storing an image of the given format. The
 135    * storage for the descriptor is allocated on the heap.
 136    *
 137    * \param[in]    img       Pointer to storage for descriptor. If this parameter
 138    *                         is NULL, the storage for the descriptor will be
 139    *                         allocated on the heap.
 140    * \param[in]    fmt       Format for the image
 141    * \param[in]    d_w       Width of the image
 142    * \param[in]    d_h       Height of the image
 143    * \param[in]    align     Alignment, in bytes, of the image buffer and
 144    *                         each row in the image(stride).
 145    *
 146    * \return Returns a pointer to the initialized image descriptor. If the img
 147    *         parameter is non-null, the value of the img parameter will be
 148    *         returned.
 149    */
 150   vpx_image_t *vpx_img_alloc(vpx_image_t  *img,
 151                              vpx_img_fmt_t fmt,
 152                              unsigned int d_w,
 153                              unsigned int d_h,
 154                              unsigned int align);
 155
 156   /*!\brief Open a descriptor, using existing storage for the underlying image
 157    *
 158    * Returns a descriptor for storing an image of the given format. The
 159    * storage for descriptor has been allocated elsewhere, and a descriptor is
 160    * desired to "wrap" that storage.
 161    *
 162    * \param[in]    img       Pointer to storage for descriptor. If this parameter
 163    *                         is NULL, the storage for the descriptor will be
 164    *                         allocated on the heap.
 165    * \param[in]    fmt       Format for the image
 166    * \param[in]    d_w       Width of the image
 167    * \param[in]    d_h       Height of the image
 168    * \param[in]    align     Alignment, in bytes, of each row in the image.
 169    * \param[in]    img_data  Storage to use for the image
 170    *
 171    * \return Returns a pointer to the initialized image descriptor. If the img
 172    *         parameter is non-null, the value of the img parameter will be
 173    *         returned.
 174    */
 175   vpx_image_t *vpx_img_wrap(vpx_image_t  *img,
 176                             vpx_img_fmt_t fmt,
 177                             unsigned int d_w,
 178                             unsigned int d_h,
 179                             unsigned int align,
 180                             unsigned char      *img_data);
 181
 182
 183   /*!\brief Set the rectangle identifying the displayed portion of the image
 184    *
 185    * Updates the displayed rectangle (aka viewport) on the image surface to
 186    * match the specified coordinates and size.
 187    *
 188    * \param[in]    img       Image descriptor
 189    * \param[in]    x         leftmost column
 190    * \param[in]    y         topmost row
 191    * \param[in]    w         width
 192    * \param[in]    h         height
 193    *
 194    * \return 0 if the requested rectangle is valid, nonzero otherwise.
 195    */
 196   int vpx_img_set_rect(vpx_image_t  *img,
 197                        unsigned int  x,
 198                        unsigned int  y,
 199                        unsigned int  w,
 200                        unsigned int  h);
 201
 202
 203   /*!\brief Flip the image vertically (top for bottom)
 204    *
 205    * Adjusts the image descriptor's pointers and strides to make the image
 206    * be referenced upside-down.
 207    *
 208    * \param[in]    img       Image descriptor
 209    */
 210   void vpx_img_flip(vpx_image_t *img);
 211
 212   /*!\brief Close an image descriptor
 213    *
 214    * Frees all allocated storage associated with an image descriptor.
 215    *
 216    * \param[in]    img       Image descriptor
 217    */
 218   void vpx_img_free(vpx_image_t *img);
 219
 220 #ifdef __cplusplus
 221 }  // extern "C"
 222 #endif
 223
 224 #endif  // VPX_VPX_IMAGE_H_