lavfi: add drawutils

Add drawutils.h and drawutils.c, and use them in the pad filter.
The new functions are going to be shared by other filters.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 117 insertions, 0 deletions

diff --git a/libavfilter/drawutils.c b/libavfilter/drawutils.c
new file mode 100644
index 0000000000..dd9ceff117
--- /dev/null
+++ b/libavfilter/drawutils.c
@@ -0,0 +1,117 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/avutil.h"
+#include "libavutil/colorspace.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];
+        }
+    }
+}