WebM VP8 Codec SDK
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Describes the vpx image descriptor and associated operations. More...
Go to the source code of this file.
Data Structures | |
struct | vpx_image |
Image Descriptor. More... | |
struct | vpx_image_rect |
Representation of a rectangle on a surface. More... | |
Macros | |
#define | VPX_IMAGE_H |
#define | VPX_IMAGE_ABI_VERSION |
Current ABI version number. | |
#define | VPX_IMG_FMT_PLANAR 0x100 |
#define | VPX_IMG_FMT_UV_FLIP 0x200 |
#define | VPX_IMG_FMT_HAS_ALPHA 0x400 |
#define | VPX_PLANE_PACKED 0 |
#define | VPX_PLANE_Y 0 |
#define | VPX_PLANE_U 1 |
#define | VPX_PLANE_V 2 |
#define | VPX_PLANE_ALPHA 3 |
Typedefs | |
typedef enum vpx_img_fmt | vpx_img_fmt_t |
List of supported image formats. More... | |
typedef struct vpx_image | vpx_image_t |
Image Descriptor. More... | |
typedef struct vpx_image_rect | vpx_image_rect_t |
Representation of a rectangle on a surface. More... | |
Enumerations | |
enum | vpx_img_fmt { VPX_IMG_FMT_NONE, VPX_IMG_FMT_RGB24, VPX_IMG_FMT_RGB32, VPX_IMG_FMT_RGB565, VPX_IMG_FMT_RGB555, VPX_IMG_FMT_UYVY, VPX_IMG_FMT_YUY2, VPX_IMG_FMT_YVYU, VPX_IMG_FMT_BGR24, VPX_IMG_FMT_RGB32_LE, VPX_IMG_FMT_ARGB, VPX_IMG_FMT_ARGB_LE, VPX_IMG_FMT_RGB565_LE, VPX_IMG_FMT_RGB555_LE, VPX_IMG_FMT_YV12 = 0x100 | 0x200 | 1, VPX_IMG_FMT_I420 = 0x100 | 2, VPX_IMG_FMT_VPXYV12 = 0x100 | 0x200 | 3, VPX_IMG_FMT_VPXI420 = 0x100 | 4 } |
List of supported image formats. More... | |
Functions | |
vpx_image_t * | vpx_img_alloc (vpx_image_t *img, vpx_img_fmt_t fmt, unsigned int d_w, unsigned int d_h, unsigned int align) |
Open a descriptor, allocating storage for the underlying image. More... | |
vpx_image_t * | vpx_img_wrap (vpx_image_t *img, vpx_img_fmt_t fmt, unsigned int d_w, unsigned int d_h, unsigned int align, unsigned char *img_data) |
Open a descriptor, using existing storage for the underlying image. More... | |
int | vpx_img_set_rect (vpx_image_t *img, unsigned int x, unsigned int y, unsigned int w, unsigned int h) |
Set the rectangle identifying the displayed portion of the image. More... | |
void | vpx_img_flip (vpx_image_t *img) |
Flip the image vertically (top for bottom) More... | |
void | vpx_img_free (vpx_image_t *img) |
Close an image descriptor. More... | |
Describes the vpx image descriptor and associated operations.
#define VPX_IMG_FMT_PLANAR 0x100 |
Image is a planar format
#define VPX_IMG_FMT_UV_FLIP 0x200 |
V plane precedes U plane in memory
#define VPX_IMG_FMT_HAS_ALPHA 0x400 |
Image has an alpha channel component
#define VPX_PLANE_PACKED 0 |
To be used for all packed formats
#define VPX_PLANE_Y 0 |
Y (Luminance) plane
#define VPX_PLANE_U 1 |
U (Chroma) plane
#define VPX_PLANE_V 2 |
V (Chroma) plane
#define VPX_PLANE_ALPHA 3 |
A (Transparency) plane
typedef enum vpx_img_fmt vpx_img_fmt_t |
List of supported image formats.
alias for enum vpx_img_fmt
typedef struct vpx_image vpx_image_t |
Image Descriptor.
alias for struct vpx_image
typedef struct vpx_image_rect vpx_image_rect_t |
Representation of a rectangle on a surface.
alias for struct vpx_image_rect
enum vpx_img_fmt |
List of supported image formats.
vpx_image_t* vpx_img_alloc | ( | vpx_image_t * | img, |
vpx_img_fmt_t | fmt, | ||
unsigned int | d_w, | ||
unsigned int | d_h, | ||
unsigned int | align | ||
) |
Open a descriptor, allocating storage for the underlying image.
Returns a descriptor for storing an image of the given format. The storage for the descriptor is allocated on the heap.
[in] | img | Pointer to storage for descriptor. If this parameter is NULL, the storage for the descriptor will be allocated on the heap. |
[in] | fmt | Format for the image |
[in] | d_w | Width of the image |
[in] | d_h | Height of the image |
[in] | align | Alignment, in bytes, of the image buffer and each row in the image(stride). |
vpx_image_t* vpx_img_wrap | ( | vpx_image_t * | img, |
vpx_img_fmt_t | fmt, | ||
unsigned int | d_w, | ||
unsigned int | d_h, | ||
unsigned int | align, | ||
unsigned char * | img_data | ||
) |
Open a descriptor, using existing storage for the underlying image.
Returns a descriptor for storing an image of the given format. The storage for descriptor has been allocated elsewhere, and a descriptor is desired to "wrap" that storage.
[in] | img | Pointer to storage for descriptor. If this parameter is NULL, the storage for the descriptor will be allocated on the heap. |
[in] | fmt | Format for the image |
[in] | d_w | Width of the image |
[in] | d_h | Height of the image |
[in] | align | Alignment, in bytes, of each row in the image. |
[in] | img_data | Storage to use for the image |
int vpx_img_set_rect | ( | vpx_image_t * | img, |
unsigned int | x, | ||
unsigned int | y, | ||
unsigned int | w, | ||
unsigned int | h | ||
) |
Set the rectangle identifying the displayed portion of the image.
Updates the displayed rectangle (aka viewport) on the image surface to match the specified coordinates and size.
[in] | img | Image descriptor |
[in] | x | leftmost column |
[in] | y | topmost row |
[in] | w | width |
[in] | h | height |
void vpx_img_flip | ( | vpx_image_t * | img) |
Flip the image vertically (top for bottom)
Adjusts the image descriptor's pointers and strides to make the image be referenced upside-down.
[in] | img | Image descriptor |
void vpx_img_free | ( | vpx_image_t * | img) |
Close an image descriptor.
Frees all allocated storage associated with an image descriptor.
[in] | img | Image descriptor |