| | |
| | | |
| | | /** |
| | | * The pixel format has an alpha channel. This is set on all formats that |
| | | * support alpha in some way. The exception is AV_PIX_FMT_PAL8, which can |
| | | * carry alpha as part of the palette. Details are explained in the |
| | | * AVPixelFormat enum, and are also encoded in the corresponding |
| | | * AVPixFmtDescriptor. |
| | | * |
| | | * The alpha is always straight, never pre-multiplied. |
| | | * support alpha in some way, including AV_PIX_FMT_PAL8. The alpha is always |
| | | * straight, never pre-multiplied. |
| | | * |
| | | * If a codec or a filter does not support alpha, it should set all alpha to |
| | | * opaque, or use the equivalent pixel formats without alpha component, e.g. |
| | |
| | | * format writes the values corresponding to the palette |
| | | * component c in data[1] to dst, rather than the palette indexes in |
| | | * data[0]. The behavior is undefined if the format is not paletted. |
| | | * @param dst_element_size size of elements in dst array (2 or 4 byte) |
| | | */ |
| | | void av_read_image_line2(void *dst, const uint8_t *data[4], |
| | | const int linesize[4], const AVPixFmtDescriptor *desc, |
| | | int x, int y, int c, int w, int read_pal_component, |
| | | int dst_element_size); |
| | | |
| | | void av_read_image_line(uint16_t *dst, const uint8_t *data[4], |
| | | const int linesize[4], const AVPixFmtDescriptor *desc, |
| | | int x, int y, int c, int w, int read_pal_component); |
| | |
| | | * @param y the vertical coordinate of the first pixel to write |
| | | * @param w the width of the line to write, that is the number of |
| | | * values to write to the image line |
| | | * @param src_element_size size of elements in src array (2 or 4 byte) |
| | | */ |
| | | void av_write_image_line2(const void *src, uint8_t *data[4], |
| | | const int linesize[4], const AVPixFmtDescriptor *desc, |
| | | int x, int y, int c, int w, int src_element_size); |
| | | |
| | | void av_write_image_line(const uint16_t *src, uint8_t *data[4], |
| | | const int linesize[4], const AVPixFmtDescriptor *desc, |
| | | int x, int y, int c, int w); |