avfilter/vsrc_testsrc: add complement mode to rgbtestsrc

libavfilter/vsrc_testsrc.c

@@ -77,6 +77,7 @@ typedef struct TestSourceContext {
 
     /* only used by rgbtest */
     uint8_t rgba_map[4];
+    int complement;
     int depth;
 
     /* only used by haldclut */
@@ -963,7 +964,13 @@ AVFilter ff_vsrc_testsrc2 = {
 
 #if CONFIG_RGBTESTSRC_FILTER
 
-#define rgbtestsrc_options options
+static const AVOption rgbtestsrc_options[] = {
+    COMMON_OPTIONS
+    { "complement", "set complement colors", OFFSET(complement), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
+    { "co",         "set complement colors", OFFSET(complement), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
+    { NULL }
+};
+
 AVFILTER_DEFINE_CLASS(rgbtestsrc);
 
 #define R 0
@@ -1024,6 +1031,29 @@ static void rgbtest_put_pixel(uint8_t *dstp[4], int dst_linesizep[4],
     }
 }
 
+static void rgbtest_fill_picture_complement(AVFilterContext *ctx, AVFrame *frame)
+{
+    TestSourceContext *test = ctx->priv;
+    int x, y, w = frame->width, h = frame->height;
+
+    for (y = 0; y < h; y++) {
+         for (x = 0; x < w; x++) {
+             int c = (1 << FFMAX(test->depth, 8))*x/w;
+             int r = 0, g = 0, b = 0;
+
+             if      (6*y < h  ) r = c;
+             else if (6*y < 2*h) g = c, b = c;
+             else if (6*y < 3*h) g = c;
+             else if (6*y < 4*h) r = c, b = c;
+             else if (6*y < 5*h) b = c;
+             else                r = c, g = c;
+
+             rgbtest_put_pixel(frame->data, frame->linesize, x, y, r, g, b,
+                               ctx->outputs[0]->format, test->rgba_map);
+         }
+     }
+}
+
 static void rgbtest_fill_picture(AVFilterContext *ctx, AVFrame *frame)
 {
     TestSourceContext *test = ctx->priv;
@@ -1049,7 +1079,7 @@ static av_cold int rgbtest_init(AVFilterContext *ctx)
     TestSourceContext *test = ctx->priv;
 
     test->draw_once = 1;
-    test->fill_picture_fn = rgbtest_fill_picture;
+    test->fill_picture_fn = test->complement ? rgbtest_fill_picture_complement : rgbtest_fill_picture;
     return init(ctx);
 }