drawutils: implement uniform and mask blending.

1 files changed, 33 insertions, 0 deletions

diff --git a/libavfilter/drawutils.h b/libavfilter/drawutils.h
index 9e98f4e7a1..29aa94b0fb 100644
--- a/libavfilter/drawutils.h
+++ b/libavfilter/drawutils.h
@@ -50,6 +50,7 @@ typedef struct FFDrawContext {
     enum PixelFormat format;
     unsigned nb_planes;
     int pixelstep[MAX_PLANES]; /*< offset between pixels */
+    uint8_t comp_mask[MAX_PLANES]; /*< bitmask of used non-alpha components */
     uint8_t hsub[MAX_PLANES];  /*< horizontal subsamling */
     uint8_t vsub[MAX_PLANES];  /*< vertical subsamling */
     uint8_t hsub_max;
@@ -57,6 +58,7 @@ typedef struct FFDrawContext {
 } FFDrawContext;
 
 typedef struct FFDrawColor {
+    uint8_t rgba[4];
     union {
         uint32_t u32;
         uint16_t u16;
@@ -101,6 +103,37 @@ void ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color,
                        int dst_x, int dst_y, int w, int h);
 
 /**
+ * Blend a rectangle with an uniform color.
+ */
+void ff_blend_rectangle(FFDrawContext *draw, FFDrawColor *color,
+                        uint8_t *dst[], int dst_linesize[],
+                        int dst_w, int dst_h,
+                        int x0, int y0, int w, int h);
+
+/**
+ * Blend an alpha mask with an uniform color.
+ *
+ * @param draw           draw context
+ * @param color          color for the overlay;
+ * @param dst            destination image
+ * @param dst_linesize   line stride of the destination
+ * @param dst_w          width of the destination image
+ * @param dst_h          height of the destination image
+ * @param mask           mask
+ * @param mask_linesize  line stride of the mask
+ * @param mask_w         width of the mask
+ * @param mask_h         height of the mask
+ * @param l2depth        log2 of depth of the mask (0 for 1bpp, 3 for 8bpp)
+ * @param endianness     bit order of the mask (0: MSB to the left)
+ * @param x0             horizontal position of the overlay
+ * @param y0             vertical position of the overlay
+ */
+void ff_blend_mask(FFDrawContext *draw, FFDrawColor *color,
+                   uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h,
+                   uint8_t *mask, int mask_linesize, int mask_w, int mask_h,
+                   int l2depth, unsigned endianness, int x0, int y0);
+
+/**
  * Round a dimension according to subsampling.
  *
  * @param draw       draw context