avutil/imgutils: add new function av_image_fill_color()

Signed-off-by: Marton Balint <cus@passwd.hu>

doc/APIchanges

@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2023-02-09
 
 API changes, most recent first:
 
+2023-12-xx - xxxxxxxxxxx - lavu 58.33.100 - imgutils.h
+  Add av_image_fill_color().
+
 2023-11-08 - b82957a66a7 - lavu 58.32.100 - channel_layout.h
   Add AV_CH_LAYOUT_7POINT2POINT3 and AV_CHANNEL_LAYOUT_7POINT2POINT3.
   Add AV_CH_LAYOUT_9POINT1POINT4_BACK and AV_CHANNEL_LAYOUT_9POINT1POINT4_BACK.

libavutil/imgutils.c

@@ -579,9 +579,9 @@ static void memset_bytes(uint8_t *dst, size_t dst_size, uint8_t *clear,
 // if it's a subsampled packed format).
 #define MAX_BLOCK_SIZE 32
 
-static int image_fill_color(uint8_t * const dst_data[4], const ptrdiff_t dst_linesize[4],
+int av_image_fill_color(uint8_t * const dst_data[4], const ptrdiff_t dst_linesize[4],
                         enum AVPixelFormat pix_fmt, const uint32_t color[4],
-                        int width, int height)
+                        int width, int height, int flags)
 {
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
     int nb_planes = av_pix_fmt_count_planes(pix_fmt);
@@ -713,5 +713,5 @@ int av_image_fill_black(uint8_t * const dst_data[4], const ptrdiff_t dst_linesiz
         colors[c] = color;
     }
 
-    return image_fill_color(dst_data, dst_linesize, pix_fmt, colors, width, height);
+    return av_image_fill_color(dst_data, dst_linesize, pix_fmt, colors, width, height, 0);
 }

libavutil/imgutils.h

@@ -339,6 +339,36 @@ int av_image_fill_black(uint8_t * const dst_data[4], const ptrdiff_t dst_linesiz
                         enum AVPixelFormat pix_fmt, enum AVColorRange range,
                         int width, int height);
 
+/**
+ * Overwrite the image data with a color. This is suitable for filling a
+ * sub-rectangle of an image, meaning the padding between the right most pixel
+ * and the left most pixel on the next line will not be overwritten. For some
+ * formats, the image size might be rounded up due to inherent alignment.
+ *
+ * If the pixel format has alpha, it is also replaced. Color component values
+ * are interpreted as native integers (or intfloats) regardless of actual pixel
+ * format endianness.
+ *
+ * This can return an error if the pixel format is not supported. Normally, all
+ * non-hwaccel pixel formats should be supported.
+ *
+ * Passing NULL for dst_data is allowed. Then the function returns whether the
+ * operation would have succeeded. (It can return an error if the pix_fmt is
+ * not supported.)
+ *
+ * @param dst_data      data pointers to destination image
+ * @param dst_linesize  linesizes for the destination image
+ * @param pix_fmt       the pixel format of the image
+ * @param color         the color components to be used for the fill
+ * @param width         the width of the image in pixels
+ * @param height        the height of the image in pixels
+ * @param flags         currently unused
+ * @return 0 if the image data was filled, a negative AVERROR code otherwise
+ */
+int av_image_fill_color(uint8_t * const dst_data[4], const ptrdiff_t dst_linesize[4],
+                        enum AVPixelFormat pix_fmt, const uint32_t color[4],
+                        int width, int height, int flags);
+
 /**
  * @}
  */

libavutil/version.h

@@ -79,7 +79,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  58
-#define LIBAVUTIL_VERSION_MINOR  32
+#define LIBAVUTIL_VERSION_MINOR  33
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \