avfilter/vf_datascope: cleanup code a little

Make few helper functions.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/vf_datascope.c

@@ -47,6 +47,8 @@ typedef struct DatascopeContext {
     FFDrawColor black;
     FFDrawColor gray;
 
+    void (*pick_color)(FFDrawContext *draw, FFDrawColor *color, AVFrame *in, int x, int y, int *value);
+    void (*reverse_color)(FFDrawContext *draw, FFDrawColor *color, FFDrawColor *reverse);
     int (*filter)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
 } DatascopeContext;
 
@@ -97,54 +99,66 @@ static void draw_text(DatascopeContext *s, AVFrame *frame, FFDrawColor *color,
     }
 }
 
-static void pick_color(FFDrawContext *draw, FFDrawColor *color, AVFrame *in, int x, int y, int *value)
+static void pick_color8(FFDrawContext *draw, FFDrawColor *color, AVFrame *in, int x, int y, int *value)
 {
     int p, i;
 
     color->rgba[3] = 255;
     for (p = 0; p < draw->nb_planes; p++) {
-        if (draw->desc->comp[p].depth == 8) {
-            if (draw->nb_planes == 1) {
-                for (i = 0; i < 4; i++) {
-                    value[i] = in->data[0][y * in->linesize[0] + x * draw->pixelstep[0] + i];
-                    color->comp[0].u8[i] = value[i];
-                }
-            } else {
-                value[p] = in->data[p][(y >> draw->vsub[p]) * in->linesize[p] + (x >> draw->hsub[p])];
-                color->comp[p].u8[0] = value[p];
+        if (draw->nb_planes == 1) {
+            for (i = 0; i < 4; i++) {
+                value[i] = in->data[0][y * in->linesize[0] + x * draw->pixelstep[0] + i];
+                color->comp[0].u8[i] = value[i];
             }
         } else {
-            if (draw->nb_planes == 1) {
-                for (i = 0; i < 4; i++) {
-                    value[i] = AV_RL16(in->data[0] + y * in->linesize[0] + x * draw->pixelstep[0] + i * 2);
-                    color->comp[0].u16[i] = value[i];
-                }
-            } else {
-                value[p] = AV_RL16(in->data[p] + (y >> draw->vsub[p]) * in->linesize[p] + (x >> draw->hsub[p]) * 2);
-                color->comp[p].u16[0] = value[p];
+            value[p] = in->data[p][(y >> draw->vsub[p]) * in->linesize[p] + (x >> draw->hsub[p])];
+            color->comp[p].u8[0] = value[p];
+        }
+    }
+}
+
+static void pick_color16(FFDrawContext *draw, FFDrawColor *color, AVFrame *in, int x, int y, int *value)
+{
+    int p, i;
+
+    color->rgba[3] = 255;
+    for (p = 0; p < draw->nb_planes; p++) {
+        if (draw->nb_planes == 1) {
+            for (i = 0; i < 4; i++) {
+                value[i] = AV_RL16(in->data[0] + y * in->linesize[0] + x * draw->pixelstep[0] + i * 2);
+                color->comp[0].u16[i] = value[i];
             }
+        } else {
+            value[p] = AV_RL16(in->data[p] + (y >> draw->vsub[p]) * in->linesize[p] + (x >> draw->hsub[p]) * 2);
+            color->comp[p].u16[0] = value[p];
         }
     }
 }
 
-static void reverse_color(FFDrawContext *draw, FFDrawColor *color, FFDrawColor *reverse)
+static void reverse_color8(FFDrawContext *draw, FFDrawColor *color, FFDrawColor *reverse)
 {
     int p;
 
     reverse->rgba[3] = 255;
     for (p = 0; p < draw->nb_planes; p++) {
-        if (draw->desc->comp[p].depth == 8) {
-            reverse->comp[p].u8[0] = color->comp[p].u8[0] > 127 ? 0 : 255;
-            reverse->comp[p].u8[1] = color->comp[p].u8[1] > 127 ? 0 : 255;
-            reverse->comp[p].u8[2] = color->comp[p].u8[2] > 127 ? 0 : 255;
-        } else {
-            const unsigned max = (1 << draw->desc->comp[p].depth) - 1;
-            const unsigned mid = (max + 1) / 2;
+        reverse->comp[p].u8[0] = color->comp[p].u8[0] > 127 ? 0 : 255;
+        reverse->comp[p].u8[1] = color->comp[p].u8[1] > 127 ? 0 : 255;
+        reverse->comp[p].u8[2] = color->comp[p].u8[2] > 127 ? 0 : 255;
+    }
+}
 
-            reverse->comp[p].u16[0] = color->comp[p].u16[0] > mid ? 0 : max;
-            reverse->comp[p].u16[1] = color->comp[p].u16[1] > mid ? 0 : max;
-            reverse->comp[p].u16[2] = color->comp[p].u16[2] > mid ? 0 : max;
-        }
+static void reverse_color16(FFDrawContext *draw, FFDrawColor *color, FFDrawColor *reverse)
+{
+    int p;
+
+    reverse->rgba[3] = 255;
+    for (p = 0; p < draw->nb_planes; p++) {
+        const unsigned max = (1 << draw->desc->comp[p].depth) - 1;
+        const unsigned mid = (max + 1) / 2;
+
+        reverse->comp[p].u16[0] = color->comp[p].u16[0] > mid ? 0 : max;
+        reverse->comp[p].u16[1] = color->comp[p].u16[1] > mid ? 0 : max;
+        reverse->comp[p].u16[2] = color->comp[p].u16[2] > mid ? 0 : max;
     }
 }
 
@@ -178,8 +192,8 @@ static int filter_color2(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs
             FFDrawColor reverse = { { 0 } };
             int value[4] = { 0 };
 
-            pick_color(&s->draw, &color, in, x + s->x, y + s->y, value);
-            reverse_color(&s->draw, &color, &reverse);
+            s->pick_color(&s->draw, &color, in, x + s->x, y + s->y, value);
+            s->reverse_color(&s->draw, &color, &reverse);
             ff_fill_rectangle(&s->draw, &color, out->data, out->linesize,
                               xoff + x * C * 10, yoff + y * P * 12, C * 10, P * 12);
 
@@ -219,7 +233,7 @@ static int filter_color(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
             FFDrawColor color = { { 0 } };
             int value[4] = { 0 };
 
-            pick_color(&s->draw, &color, in, x + s->x, y + s->y, value);
+            s->pick_color(&s->draw, &color, in, x + s->x, y + s->y, value);
 
             for (p = 0; p < P; p++) {
                 char text[256];
@@ -257,7 +271,7 @@ static int filter_mono(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
             FFDrawColor color = { { 0 } };
             int value[4] = { 0 };
 
-            pick_color(&s->draw, &color, in, x + s->x, y + s->y, value);
+            s->pick_color(&s->draw, &color, in, x + s->x, y + s->y, value);
             for (p = 0; p < P; p++) {
                 char text[256];
 
@@ -354,6 +368,14 @@ static int config_input(AVFilterLink *inlink)
     case 2: s->filter = filter_color2; break;
     }
 
+    if (s->draw.desc->comp[0].depth <= 8) {
+        s->pick_color = pick_color8;
+        s->reverse_color = reverse_color8;
+    } else {
+        s->pick_color = pick_color16;
+        s->reverse_color = reverse_color16;
+    }
+
     return 0;
 }