tests: use color_float rgb[] alias more

Iterate over rgb[] array instead of repeating the code for .r, .g and
.b.

Also in process_pipeline_comparison() f_max_err variable is dropped
since it was not used much.

This should make the code easier to read.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

tests/alpha-blending-test.c

@@ -109,14 +109,14 @@ premult_color(uint32_t a, uint32_t r, uint32_t g, uint32_t b)
 static void
 unpremult_float(struct color_float *cf)
 {
+	int i;
+
 	if (cf->a == 0.0f) {
-		cf->r = 0.0f;
-		cf->g = 0.0f;
-		cf->b = 0.0f;
+		for (i = 0; i < COLOR_CHAN_NUM; i++)
+			cf->rgb[i] = 0.0f;
 	} else {
-		cf->r /= cf->a;
-		cf->g /= cf->a;
-		cf->b /= cf->a;
+		for (i = 0; i < COLOR_CHAN_NUM; i++)
+			cf->rgb[i] /= cf->a;
 	}
 }
 
@@ -218,11 +218,13 @@ verify_sRGB_blend_a8r8g8b8(uint32_t bg32, uint32_t fg32, uint32_t dst32,
 			   int x, struct color_float *max_diff,
 			   enum blend_space space)
 {
+	const char *const chan_name[COLOR_CHAN_NUM] = { "r", "g", "b" };
 	struct color_float bg = a8r8g8b8_to_float(bg32);
 	struct color_float fg = a8r8g8b8_to_float(fg32);
 	struct color_float dst = a8r8g8b8_to_float(dst32);
 	struct color_float ref;
 	bool ok = true;
+	int i;
 
 	unpremult_float(&bg);
 	unpremult_float(&fg);
@@ -233,16 +235,16 @@ verify_sRGB_blend_a8r8g8b8(uint32_t bg32, uint32_t fg32, uint32_t dst32,
 		sRGB_linearize(&fg);
 	}
 
-	ref.r = (1.0f - fg.a) * bg.r + fg.a * fg.r;
-	ref.g = (1.0f - fg.a) * bg.g + fg.a * fg.g;
-	ref.b = (1.0f - fg.a) * bg.b + fg.a * fg.b;
+	for (i = 0; i < COLOR_CHAN_NUM; i++)
+		ref.rgb[i] = (1.0f - fg.a) * bg.rgb[i] + fg.a * fg.rgb[i];
 
 	if (space == BLEND_LINEAR)
 		sRGB_delinearize(&ref);
 
-	ok = compare_float(ref.r, dst.r, x, "r", &max_diff->r) && ok;
-	ok = compare_float(ref.g, dst.g, x, "g", &max_diff->g) && ok;
-	ok = compare_float(ref.b, dst.b, x, "b", &max_diff->b) && ok;
+	for (i = 0; i < COLOR_CHAN_NUM; i++) {
+		ok = compare_float(ref.rgb[i], dst.rgb[i], x,
+				   chan_name[i], &max_diff->rgb[i]) && ok;
+	}
 
 	return ok;
 }

tests/color-shaper-matrix-test.c

@@ -166,7 +166,7 @@ get_image_prop(struct buffer *buf, struct image_header *header)
 static void
 gen_ramp_rgb(const struct image_header *header, int bitwidth, int width_bar)
 {
-	static const int hue[][3] = {
+	static const int hue[][COLOR_CHAN_NUM] = {
 		{ 1, 1, 1 },	/* White	*/
 		{ 1, 1, 0 },	/* Yellow 	*/
 		{ 0, 1, 1 },	/* Cyan 	*/
@@ -180,6 +180,7 @@ gen_ramp_rgb(const struct image_header *header, int bitwidth, int width_bar)
 	float val_max;
 	int x, y;
 	int hue_index;
+	int chan;
 	float value;
 	unsigned char r, g, b;
 	uint32_t *pixel;
@@ -200,12 +201,10 @@ gen_ramp_rgb(const struct image_header *header, int bitwidth, int width_bar)
 			if (width_bar > 1)
 				value = floor(value * n_steps) / n_steps;
 
-			if (hue[hue_index][0])
-				rgb.r = value;
-			if (hue[hue_index][1])
-				rgb.g = value;
-			if (hue[hue_index][2])
-				rgb.b = value;
+			for (chan = 0; chan < COLOR_CHAN_NUM; chan++) {
+				if (hue[hue_index][chan])
+					rgb.rgb[chan] = value;
+			}
 
 			sRGB_delinearize(&rgb);
 
@@ -359,14 +358,15 @@ process_pipeline_comparison(const struct image_header *src,
 			    const struct image_header *shot,
 			    const struct setup_args * arg)
 {
+	const char *const chan_name[COLOR_CHAN_NUM] = { "r", "g", "b" };
 	const float max_pixel_value = 255.0;
 	struct color_float max_diff_pipeline = { .rgb = { 0.0f, 0.0f, 0.0f } };
 	float max_allow_diff = arg->pipeline.tolerance / max_pixel_value;
-	float max_err = 0;
-	float f_max_err = 0;
+	float max_err = 0.0f;
 	bool ok = true;
 	uint32_t *row_ptr, *row_ptr_shot;
 	int y, x;
+	int chan;
 	struct color_float pix_src;
 	struct color_float pix_src_pipeline;
 	struct color_float pix_shot;
@@ -383,26 +383,25 @@ process_pipeline_comparison(const struct image_header *src,
 						     &arg->pipeline.mat,
 						     arg->pipeline.post_fn,
 						     &pix_src, &pix_src_pipeline);
+
 			/* check if pipeline matches to shader variant */
-			ok &= compare_float(pix_src_pipeline.r, pix_shot.r, x,"r",
-					    &max_diff_pipeline.r, max_allow_diff);
-			ok &= compare_float(pix_src_pipeline.g, pix_shot.g, x, "g",
-					    &max_diff_pipeline.g, max_allow_diff);
-			ok &= compare_float(pix_src_pipeline.b, pix_shot.b, x, "b",
-					    &max_diff_pipeline.b, max_allow_diff);
+			for (chan = 0; chan < COLOR_CHAN_NUM; chan++) {
+				ok &= compare_float(pix_src_pipeline.rgb[chan],
+						    pix_shot.rgb[chan],
+						    x, chan_name[chan],
+						    &max_diff_pipeline.rgb[chan],
+						    max_allow_diff);
+			}
 		}
 	}
-	max_err = max_diff_pipeline.r;
-	if (max_err < max_diff_pipeline.g)
-		max_err = max_diff_pipeline.g;
-	if (max_err < max_diff_pipeline.b)
-		max_err = max_diff_pipeline.b;
 
-	f_max_err = max_pixel_value * max_err;
+	for (chan = 0; chan < COLOR_CHAN_NUM; chan++)
+		max_err = MAX(max_err, max_diff_pipeline.rgb[chan]);
 
 	testlog("%s %s %s tol_req %d, tol_cal %f, max diff: r=%f, g=%f, b=%f\n",
 		__func__, ok == true? "SUCCESS":"FAILURE",
-		arg->meta.name, arg->pipeline.tolerance, f_max_err,
+		arg->meta.name, arg->pipeline.tolerance,
+		max_err * max_pixel_value,
 		max_diff_pipeline.r, max_diff_pipeline.g, max_diff_pipeline.b);
 
 	return ok;

tests/color_util.c

@@ -229,28 +229,19 @@ process_pixel_using_pipeline(enum transfer_fn pre_curve,
 			     struct color_float *out)
 {
 	int i, j;
-	float rgb_in[3];
-	float out_blend[3];
+	struct color_float cf;
 	float tmp;
 
-	rgb_in[0] = in->r;
-	rgb_in[1] = in->g;
-	rgb_in[2] = in->b;
-
-	for (i = 0; i < 3; i++)
-		rgb_in[i] = apply_tone_curve(pre_curve, rgb_in[i]);
+	for (i = 0; i < COLOR_CHAN_NUM; i++)
+		cf.rgb[i] = apply_tone_curve(pre_curve, in->rgb[i]);
 
 	for (i = 0; i < 3; i++) {
 		tmp = 0.0f;
 		for (j = 0; j < 3; j++)
-			tmp += rgb_in[j] * mat->v[j].n[i];
-		out_blend[i] = tmp;
+			tmp += cf.rgb[j] * mat->v[j].n[i];
+		out->rgb[i] = tmp;
 	}
 
-	for (i = 0; i < 3; i++)
-		out_blend[i] = apply_tone_curve(post_curve, out_blend[i]);
-
-	out->r = out_blend[0];
-	out->g = out_blend[1];
-	out->b = out_blend[2];
+	for (i = 0; i < COLOR_CHAN_NUM; i++)
+		out->rgb[i] = apply_tone_curve(post_curve, out->rgb[i]);
 }