[igt-dev] [PATCH v2 1/4] lib/color_encoding: Prepare support for HDR modes.

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 lib/igt_color_encoding.c | 83 +++++++++++++++++++++++++++++++---------
 lib/igt_color_encoding.h |  9 ++++-
 lib/igt_fb.c             | 10 +++--
 3 files changed, 79 insertions(+), 23 deletions(-)

diff --git a/lib/igt_color_encoding.c b/lib/igt_color_encoding.c
index 03e16e0c9658..4cbe18e217e3 100644
--- a/lib/igt_color_encoding.c
+++ b/lib/igt_color_encoding.c
@@ -24,6 +24,8 @@
 #include "igt_color_encoding.h"
 #include "igt_matrix.h"
 #include "igt_core.h"
+#include "igt_fb.h"
+#include "drmtest.h"
 
 struct color_encoding {
 	float kr, kb;
@@ -85,60 +87,105 @@ static struct igt_mat4 ycbcr_to_rgb_matrix(const struct color_encoding *e)
 	return ret;
 }
 
-static struct igt_mat4 ycbcr_input_convert_matrix(enum igt_color_range color_range)
+static struct igt_mat4 ycbcr_input_convert_matrix(enum igt_color_range color_range, float scale,
+						  float ofs_y, float max_y,
+						  float ofs_cbcr, float mid_cbcr, float max_cbcr,
+						  float max_val)
 {
 	struct igt_mat4 t, s;
 
 	if (color_range == IGT_COLOR_YCBCR_FULL_RANGE) {
-		t = igt_matrix_translate(0.0f, -128.0f, -128.0f);
-		s = igt_matrix_scale(1.0f, 2.0f, 2.0f);
+		t = igt_matrix_translate(0.f, -mid_cbcr, -mid_cbcr);
+		s = igt_matrix_scale(scale, 2.0f * scale, 2.0f * scale);
 	} else {
-		t = igt_matrix_translate(-16.0f, -128.0f, -128.0f);
-		s = igt_matrix_scale(255.0f / (235.0f - 16.0f),
-				     255.0f / (240.0f - 128.0f),
-				     255.0f / (240.0f - 128.0f));
+		t = igt_matrix_translate(-ofs_y, -mid_cbcr, -mid_cbcr);
+		s = igt_matrix_scale(scale * max_val / (max_y - ofs_y),
+				     scale * max_val / (max_cbcr - mid_cbcr),
+				     scale * max_val / (max_cbcr - mid_cbcr));
 	}
 
 	return igt_matrix_multiply(&s, &t);
 }
 
-static struct igt_mat4 ycbcr_output_convert_matrix(enum igt_color_range color_range)
+static struct igt_mat4 ycbcr_output_convert_matrix(enum igt_color_range color_range, float scale,
+						   float ofs_y, float max_y,
+						   float ofs_cbcr, float mid_cbcr, float max_cbcr,
+						   float max_val)
 {
 	struct igt_mat4 s, t;
 
 	if (color_range == IGT_COLOR_YCBCR_FULL_RANGE) {
-		s = igt_matrix_scale(1.0f, 0.5f, 0.5f);
-		t = igt_matrix_translate(0.0f, 128.0f, 128.0f);
+		s = igt_matrix_scale(scale, 0.5f * scale, 0.5f * scale);
+		t = igt_matrix_translate(0.f, mid_cbcr, mid_cbcr);
 	} else {
-		s = igt_matrix_scale((235.0f - 16.0f) / 255.0f,
-				     (240.0f - 128.0f) / 255.0f,
-				     (240.0f - 128.0f) / 255.0f);
-		t = igt_matrix_translate(16.0f, 128.0f, 128.0f);
+		s = igt_matrix_scale(scale * (max_y - ofs_y) / max_val,
+				     scale * (max_cbcr - mid_cbcr) / max_val,
+				     scale * (max_cbcr - mid_cbcr) / max_val);
+		t = igt_matrix_translate(ofs_y, mid_cbcr, mid_cbcr);
 	}
 
 	return igt_matrix_multiply(&t, &s);
 }
 
-struct igt_mat4 igt_ycbcr_to_rgb_matrix(enum igt_color_encoding color_encoding,
+static const struct color_encoding_format {
+	uint32_t fourcc;
+
+	float max_val;
+
+	float ofs_y, max_y, ofs_cbcr, mid_cbcr, max_cbcr;
+} formats[] = {
+	{ DRM_FORMAT_XRGB8888, 255.f, },
+	{ DRM_FORMAT_NV12, 255.f, 16.f, 235.f, 16.f, 128.f, 240.f },
+	{ DRM_FORMAT_YUYV, 255.f, 16.f, 235.f, 16.f, 128.f, 240.f },
+	{ DRM_FORMAT_YVYU, 255.f, 16.f, 235.f, 16.f, 128.f, 240.f },
+	{ DRM_FORMAT_UYVY, 255.f, 16.f, 235.f, 16.f, 128.f, 240.f },
+	{ DRM_FORMAT_VYUY, 255.f, 16.f, 235.f, 16.f, 128.f, 240.f },
+};
+
+static const struct color_encoding_format *lookup_fourcc(uint32_t fourcc)
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(formats); i++)
+		if (fourcc == formats[i].fourcc)
+			return &formats[i];
+
+	igt_assert_f(0, "Could not look up fourcc %.4s\n", (char *)&fourcc);
+}
+
+struct igt_mat4 igt_ycbcr_to_rgb_matrix(uint32_t from_fourcc,
+					uint32_t to_fourcc,
+					enum igt_color_encoding color_encoding,
 					enum igt_color_range color_range)
 {
 	const struct color_encoding *e = &color_encodings[color_encoding];
 	struct igt_mat4 r, c;
+	const struct color_encoding_format *fycbcr = lookup_fourcc(from_fourcc);
+	const struct color_encoding_format *frgb = lookup_fourcc(to_fourcc);
+	float scale = frgb->max_val / fycbcr->max_val;
 
-	r = ycbcr_input_convert_matrix(color_range);
+	igt_assert(fycbcr->ofs_y && !frgb->ofs_y);
+
+	r = ycbcr_input_convert_matrix(color_range, scale, fycbcr->ofs_y, fycbcr->max_y, fycbcr->ofs_cbcr, fycbcr->mid_cbcr, fycbcr->max_cbcr, fycbcr->max_val);
 	c = ycbcr_to_rgb_matrix(e);
 
 	return igt_matrix_multiply(&c, &r);
 }
 
-struct igt_mat4 igt_rgb_to_ycbcr_matrix(enum igt_color_encoding color_encoding,
+struct igt_mat4 igt_rgb_to_ycbcr_matrix(uint32_t from_fourcc,
+					uint32_t to_fourcc,
+					enum igt_color_encoding color_encoding,
 					enum igt_color_range color_range)
 {
 	const struct color_encoding *e = &color_encodings[color_encoding];
+	const struct color_encoding_format *frgb = lookup_fourcc(from_fourcc);
+	const struct color_encoding_format *fycbcr = lookup_fourcc(to_fourcc);
 	struct igt_mat4 c, r;
+	float scale = fycbcr->max_val / frgb->max_val;
+
+	igt_assert(fycbcr->ofs_y && !frgb->ofs_y);
 
 	c = rgb_to_ycbcr_matrix(e);
-	r = ycbcr_output_convert_matrix(color_range);
+	r = ycbcr_output_convert_matrix(color_range, scale, fycbcr->ofs_y, fycbcr->max_y, fycbcr->ofs_cbcr, fycbcr->mid_cbcr, fycbcr->max_cbcr, fycbcr->max_val);
 
 	return igt_matrix_multiply(&r, &c);
 }
diff --git a/lib/igt_color_encoding.h b/lib/igt_color_encoding.h
index 3884e4939f4c..db45b16d3687 100644
--- a/lib/igt_color_encoding.h
+++ b/lib/igt_color_encoding.h
@@ -25,6 +25,7 @@
 #define __IGT_COLOR_ENCODING_H__
 
 #include <stdbool.h>
+#include <stdint.h>
 
 #include "igt_matrix.h"
 
@@ -44,9 +45,13 @@ enum igt_color_range {
 const char *igt_color_encoding_to_str(enum igt_color_encoding encoding);
 const char *igt_color_range_to_str(enum igt_color_range range);
 
-struct igt_mat4 igt_ycbcr_to_rgb_matrix(enum igt_color_encoding color_encoding,
+struct igt_mat4 igt_ycbcr_to_rgb_matrix(uint32_t ycbcr_fourcc,
+					uint32_t rgb_fourcc,
+					enum igt_color_encoding color_encoding,
 					enum igt_color_range color_range);
-struct igt_mat4 igt_rgb_to_ycbcr_matrix(enum igt_color_encoding color_encoding,
+struct igt_mat4 igt_rgb_to_ycbcr_matrix(uint32_t rgb_fourcc,
+					uint32_t ycbcr_fourcc,
+					enum igt_color_encoding color_encoding,
 					enum igt_color_range color_range);
 
 #endif /* __IGT_COLOR_ENCODING_H__ */
diff --git a/lib/igt_fb.c b/lib/igt_fb.c
index 5d8c187a9ac9..db3ae06748d1 100644
--- a/lib/igt_fb.c
+++ b/lib/igt_fb.c
@@ -1508,7 +1508,7 @@ static void *igt_fb_create_cairo_shadow_buffer(int fd,
 		DRM_FORMAT_XRGB8888, LOCAL_DRM_FORMAT_MOD_NONE,
 		IGT_COLOR_YCBCR_BT709, IGT_COLOR_YCBCR_LIMITED_RANGE);
 
-	shadow->strides[0] = ALIGN(width * 4, 16);
+	shadow->strides[0] = ALIGN(width * shadow->plane_bpp[0], 16);
 	shadow->size = ALIGN(shadow->strides[0] * height,
 			     sysconf(_SC_PAGESIZE));
 	ptr = mmap(NULL, shadow->size, PROT_READ | PROT_WRITE,
@@ -1681,7 +1681,9 @@ static void convert_yuv_to_rgb24(struct fb_convert *cvt)
 	uint8_t *y, *u, *v;
 	uint8_t *rgb24 = cvt->dst.ptr;
 	unsigned int rgb24_stride = cvt->dst.fb->strides[0];
-	struct igt_mat4 m = igt_ycbcr_to_rgb_matrix(cvt->src.fb->color_encoding,
+	struct igt_mat4 m = igt_ycbcr_to_rgb_matrix(cvt->src.fb->drm_format,
+						    cvt->dst.fb->drm_format,
+						    cvt->src.fb->color_encoding,
 						    cvt->src.fb->color_range);
 	uint8_t *buf;
 	struct yuv_parameters params = { };
@@ -1742,7 +1744,9 @@ static void convert_rgb24_to_yuv(struct fb_convert *cvt)
 	const uint8_t *rgb24 = cvt->src.ptr;
 	uint8_t bpp = 4;
 	unsigned rgb24_stride = cvt->src.fb->strides[0];
-	struct igt_mat4 m = igt_rgb_to_ycbcr_matrix(cvt->dst.fb->color_encoding,
+	struct igt_mat4 m = igt_rgb_to_ycbcr_matrix(cvt->src.fb->drm_format,
+						    cvt->dst.fb->drm_format,
+						    cvt->dst.fb->color_encoding,
 						    cvt->dst.fb->color_range);
 	struct yuv_parameters params = { };
 
-- 
2.20.1

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