FFmpeg/libavfilter/drawutils.c

/*
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <string.h>

#include "libavutil/avutil.h"
#include "libavutil/colorspace.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "drawutils.h"

enum { RED = 0, GREEN, BLUE, ALPHA };

int ff_fill_line_with_color(uint8_t *line[4], int pixel_step[4], int w, uint8_t dst_color[4],
                            enum PixelFormat pix_fmt, uint8_t rgba_color[4],
                            int *is_packed_rgba, uint8_t rgba_map_ptr[4])
{
    uint8_t rgba_map[4] = {0};
    int i;
    const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[pix_fmt];
    int hsub = pix_desc->log2_chroma_w;

    *is_packed_rgba = 1;
    switch (pix_fmt) {
    case PIX_FMT_ARGB:  rgba_map[ALPHA] = 0; rgba_map[RED  ] = 1; rgba_map[GREEN] = 2; rgba_map[BLUE ] = 3; break;
    case PIX_FMT_ABGR:  rgba_map[ALPHA] = 0; rgba_map[BLUE ] = 1; rgba_map[GREEN] = 2; rgba_map[RED  ] = 3; break;
    case PIX_FMT_RGBA:
    case PIX_FMT_RGB24: rgba_map[RED  ] = 0; rgba_map[GREEN] = 1; rgba_map[BLUE ] = 2; rgba_map[ALPHA] = 3; break;
    case PIX_FMT_BGRA:
    case PIX_FMT_BGR24: rgba_map[BLUE ] = 0; rgba_map[GREEN] = 1; rgba_map[RED  ] = 2; rgba_map[ALPHA] = 3; break;
    default:
        *is_packed_rgba = 0;
    }

    if (*is_packed_rgba) {
        pixel_step[0] = (av_get_bits_per_pixel(pix_desc))>>3;
        for (i = 0; i < 4; i++)
            dst_color[rgba_map[i]] = rgba_color[i];

        line[0] = av_malloc(w * pixel_step[0]);
        for (i = 0; i < w; i++)
            memcpy(line[0] + i * pixel_step[0], dst_color, pixel_step[0]);
        if (rgba_map_ptr)
            memcpy(rgba_map_ptr, rgba_map, sizeof(rgba_map[0]) * 4);
    } else {
        int plane;

        dst_color[0] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
        dst_color[1] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
        dst_color[2] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
        dst_color[3] = rgba_color[3];

        for (plane = 0; plane < 4; plane++) {
            int line_size;
            int hsub1 = (plane == 1 || plane == 2) ? hsub : 0;

            pixel_step[plane] = 1;
            line_size = (w >> hsub1) * pixel_step[plane];
            line[plane] = av_malloc(line_size);
            memset(line[plane], dst_color[plane], line_size);
        }
    }

    return 0;
}

void ff_draw_rectangle(uint8_t *dst[4], int dst_linesize[4],
                       uint8_t *src[4], int pixelstep[4],
                       int hsub, int vsub, int x, int y, int w, int h)
{
    int i, plane;
    uint8_t *p;

    for (plane = 0; plane < 4 && dst[plane]; plane++) {
        int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
        int vsub1 = plane == 1 || plane == 2 ? vsub : 0;

        p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
        for (i = 0; i < (h >> vsub1); i++) {
            memcpy(p + (x >> hsub1) * pixelstep[plane],
                   src[plane], (w >> hsub1) * pixelstep[plane]);
            p += dst_linesize[plane];
        }
    }
}

void ff_copy_rectangle(uint8_t *dst[4], int dst_linesize[4],
                       uint8_t *src[4], int src_linesize[4], int pixelstep[4],
                       int hsub, int vsub, int x, int y, int y2, int w, int h)
{
    int i, plane;
    uint8_t *p;

    for (plane = 0; plane < 4 && dst[plane]; plane++) {
        int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
        int vsub1 = plane == 1 || plane == 2 ? vsub : 0;

        p = dst[plane] + (y >> vsub1) * dst_linesize[plane];
        for (i = 0; i < (h >> vsub1); i++) {
            memcpy(p + (x >> hsub1) * pixelstep[plane],
                   src[plane] + src_linesize[plane]*(i+(y2>>vsub1)), (w >> hsub1) * pixelstep[plane]);
            p += dst_linesize[plane];
        }
    }
}