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 #ifdef __cplusplus
  17 extern "C" {
  18 #endif
  19
  20 #ifndef VPX_IMAGE_H
  21 #define VPX_IMAGE_H
  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 (1) /**<\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 plane in memory */
  36 #define VPX_IMG_FMT_HAS_ALPHA  0x400  /**< Image has an alpha channel component */
  37
  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   /** < planar 4:2:0 format with vpx color space */
  59     }
  60     vpx_img_fmt_t; /**< alias for enum vpx_img_fmt */
  61
  62 #if !defined(VPX_CODEC_DISABLE_COMPAT) || !VPX_CODEC_DISABLE_COMPAT
  63 #define IMG_FMT_PLANAR         VPX_IMG_FMT_PLANAR     /**< \deprecated Use #VPX_IMG_FMT_PLANAR */
  64 #define IMG_FMT_UV_FLIP        VPX_IMG_FMT_UV_FLIP    /**< \deprecated Use #VPX_IMG_FMT_UV_FLIP */
  65 #define IMG_FMT_HAS_ALPHA      VPX_IMG_FMT_HAS_ALPHA  /**< \deprecated Use #VPX_IMG_FMT_HAS_ALPHA */
  66
  67     /*!\brief Deprecated list of supported image formats
  68      * \deprecated New code should use #vpx_img_fmt
  69      */
  70 #define img_fmt   vpx_img_fmt
  71     /*!\brief alias for enum img_fmt.
  72      * \deprecated New code should use #vpx_img_fmt_t
  73      */
  74 #define img_fmt_t vpx_img_fmt_t
  75
  76 #define IMG_FMT_NONE       VPX_IMG_FMT_NONE       /**< \deprecated Use #VPX_IMG_FMT_NONE */
  77 #define IMG_FMT_RGB24      VPX_IMG_FMT_RGB24      /**< \deprecated Use #VPX_IMG_FMT_RGB24 */
  78 #define IMG_FMT_RGB32      VPX_IMG_FMT_RGB32      /**< \deprecated Use #VPX_IMG_FMT_RGB32 */
  79 #define IMG_FMT_RGB565     VPX_IMG_FMT_RGB565     /**< \deprecated Use #VPX_IMG_FMT_RGB565 */
  80 #define IMG_FMT_RGB555     VPX_IMG_FMT_RGB555     /**< \deprecated Use #VPX_IMG_FMT_RGB555 */
  81 #define IMG_FMT_UYVY       VPX_IMG_FMT_UYVY       /**< \deprecated Use #VPX_IMG_FMT_UYVY */
  82 #define IMG_FMT_YUY2       VPX_IMG_FMT_YUY2       /**< \deprecated Use #VPX_IMG_FMT_YUY2 */
  83 #define IMG_FMT_YVYU       VPX_IMG_FMT_YVYU       /**< \deprecated Use #VPX_IMG_FMT_YVYU */
  84 #define IMG_FMT_BGR24      VPX_IMG_FMT_BGR24      /**< \deprecated Use #VPX_IMG_FMT_BGR24 */
  85 #define IMG_FMT_RGB32_LE   VPX_IMG_FMT_RGB32_LE   /**< \deprecated Use #VPX_IMG_FMT_RGB32_LE */
  86 #define IMG_FMT_ARGB       VPX_IMG_FMT_ARGB       /**< \deprecated Use #VPX_IMG_FMT_ARGB */
  87 #define IMG_FMT_ARGB_LE    VPX_IMG_FMT_ARGB_LE    /**< \deprecated Use #VPX_IMG_FMT_ARGB_LE */
  88 #define IMG_FMT_RGB565_LE  VPX_IMG_FMT_RGB565_LE  /**< \deprecated Use #VPX_IMG_FMT_RGB565_LE */
  89 #define IMG_FMT_RGB555_LE  VPX_IMG_FMT_RGB555_LE  /**< \deprecated Use #VPX_IMG_FMT_RGB555_LE */
  90 #define IMG_FMT_YV12       VPX_IMG_FMT_YV12       /**< \deprecated Use #VPX_IMG_FMT_YV12 */
  91 #define IMG_FMT_I420       VPX_IMG_FMT_I420       /**< \deprecated Use #VPX_IMG_FMT_I420 */
  92 #define IMG_FMT_VPXYV12    VPX_IMG_FMT_VPXYV12    /**< \deprecated Use #VPX_IMG_FMT_VPXYV12 */
  93 #define IMG_FMT_VPXI420    VPX_IMG_FMT_VPXI420    /**< \deprecated Use #VPX_IMG_FMT_VPXI420 */
  94 #endif /* VPX_CODEC_DISABLE_COMPAT */
  95
  96     /**\brief Image Descriptor */
  97     typedef struct vpx_image
  98     {
  99         vpx_img_fmt_t fmt; /**< Image Format */
 100
 101         /* Image storage dimensions */
 102         unsigned int  w;   /**< Stored image width */
 103         unsigned int  h;   /**< Stored image height */
 104
 105         /* Image display dimensions */
 106         unsigned int  d_w;   /**< Displayed image width */
 107         unsigned int  d_h;   /**< Displayed image height */
 108
 109         /* Chroma subsampling info */
 110         unsigned int  x_chroma_shift;   /**< subsampling order, X */
 111         unsigned int  y_chroma_shift;   /**< subsampling order, Y */
 112
 113         /* Image data pointers. */
 114 #define VPX_PLANE_PACKED 0   /**< To be used for all packed formats */
 115 #define VPX_PLANE_Y      0   /**< Y (Luminance) plane */
 116 #define VPX_PLANE_U      1   /**< U (Chroma) plane */
 117 #define VPX_PLANE_V      2   /**< V (Chroma) plane */
 118 #define VPX_PLANE_ALPHA  3   /**< A (Transparency) plane */
 119 #if !defined(VPX_CODEC_DISABLE_COMPAT) || !VPX_CODEC_DISABLE_COMPAT
 120 #define PLANE_PACKED     VPX_PLANE_PACKED
 121 #define PLANE_Y          VPX_PLANE_Y
 122 #define PLANE_U          VPX_PLANE_U
 123 #define PLANE_V          VPX_PLANE_V
 124 #define PLANE_ALPHA      VPX_PLANE_ALPHA
 125 #endif
 126         unsigned char *planes[4];  /**< pointer to the top left pixel for each plane */
 127         int      stride[4];  /**< stride between rows for each plane */
 128
 129         int     bps; /**< bits per sample (for packed formats) */
 130
 131         /* The following member may be set by the application to associate data
 132          * with this image.
 133          */
 134         void    *user_priv; /**< may be set by the application to associate data
 135                          *   with this image. */
 136
 137         /* The following members should be treated as private. */
 138         unsigned char *img_data;       /**< private */
 139         int      img_data_owner; /**< private */
 140         int      self_allocd;    /**< private */
 141     } vpx_image_t; /**< alias for struct vpx_image */
 142
 143     /**\brief Representation of a rectangle on a surface */
 144     typedef struct vpx_image_rect
 145     {
 146         unsigned int x; /**< leftmost column */
 147         unsigned int y; /**< topmost row */
 148         unsigned int w; /**< width */
 149         unsigned int h; /**< height */
 150     } vpx_image_rect_t; /**< alias for struct vpx_image_rect */
 151
 152     /*!\brief Open a descriptor, allocating storage for the underlying image
 153      *
 154      * Returns a descriptor for storing an image of the given format. The
 155      * storage for the descriptor is allocated on the heap.
 156      *
 157      * \param[in]    img       Pointer to storage for descriptor. If this parameter
 158      *                         is NULL, the storage for the descriptor will be
 159      *                         allocated on the heap.
 160      * \param[in]    fmt       Format for the image
 161      * \param[in]    d_w       Width of the image
 162      * \param[in]    d_h       Height of the image
 163      * \param[in]    align     Alignment, in bytes, of each row in the image.
 164      *
 165      * \return Returns a pointer to the initialized image descriptor. If the img
 166      *         parameter is non-null, the value of the img parameter will be
 167      *         returned.
 168      */
 169     vpx_image_t *vpx_img_alloc(vpx_image_t  *img,
 170                                vpx_img_fmt_t fmt,
 171                                unsigned int d_w,
 172                                unsigned int d_h,
 173                                unsigned int align);
 174
 175     /*!\brief Open a descriptor, using existing storage for the underlying image
 176      *
 177      * Returns a descriptor for storing an image of the given format. The
 178      * storage for descriptor has been allocated elsewhere, and a descriptor is
 179      * desired to "wrap" that storage.
 180      *
 181      * \param[in]    img       Pointer to storage for descriptor. If this parameter
 182      *                         is NULL, the storage for the descriptor will be
 183      *                         allocated on the heap.
 184      * \param[in]    fmt       Format for the image
 185      * \param[in]    d_w       Width of the image
 186      * \param[in]    d_h       Height of the image
 187      * \param[in]    align     Alignment, in bytes, of each row in the image.
 188      * \param[in]    img_data  Storage to use for the image
 189      *
 190      * \return Returns a pointer to the initialized image descriptor. If the img
 191      *         parameter is non-null, the value of the img parameter will be
 192      *         returned.
 193      */
 194     vpx_image_t *vpx_img_wrap(vpx_image_t  *img,
 195                               vpx_img_fmt_t fmt,
 196                               unsigned int d_w,
 197                               unsigned int d_h,
 198                               unsigned int align,
 199                               unsigned char      *img_data);
 200
 201
 202     /*!\brief Set the rectangle identifying the displayed portion of the image
 203      *
 204      * Updates the displayed rectangle (aka viewport) on the image surface to
 205      * match the specified coordinates and size.
 206      *
 207      * \param[in]    img       Image descriptor
 208      * \param[in]    x         leftmost column
 209      * \param[in]    y         topmost row
 210      * \param[in]    w         width
 211      * \param[in]    h         height
 212      *
 213      * \return 0 if the requested rectangle is valid, nonzero otherwise.
 214      */
 215     int vpx_img_set_rect(vpx_image_t  *img,
 216                          unsigned int  x,
 217                          unsigned int  y,
 218                          unsigned int  w,
 219                          unsigned int  h);
 220
 221
 222     /*!\brief Flip the image vertically (top for bottom)
 223      *
 224      * Adjusts the image descriptor's pointers and strides to make the image
 225      * be referenced upside-down.
 226      *
 227      * \param[in]    img       Image descriptor
 228      */
 229     void vpx_img_flip(vpx_image_t *img);
 230
 231     /*!\brief Close an image descriptor
 232      *
 233      * Frees all allocated storage associated with an image descriptor.
 234      *
 235      * \param[in]    img       Image descriptor
 236      */
 237     void vpx_img_free(vpx_image_t *img);
 238
 239 #endif
 240 #ifdef __cplusplus
 241 }
 242 #endif