Add support for drawing the SMPTE pattern in a buffer using the C2
indexed format.
As only four colors are available, resolution is halved, and the pattern
is drawn in a PenTile RG-GB matrix, using Floyd-Steinberg dithering.
The magnitude of the green subpixels is reduced, as there are twice as
many green subpixels as red or blue subpixels.
Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
---
v2:
- New.
---
tests/util/pattern.c | 97 +++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 96 insertions(+), 1 deletion(-)
diff --git a/tests/util/pattern.c b/tests/util/pattern.c
index 5ec7d66495209df4..a5c4e31ad856709e 100644
--- a/tests/util/pattern.c
+++ b/tests/util/pattern.c
@@ -825,6 +825,93 @@ static void fill_smpte_c1(void *mem, unsigned int width, unsigned int height,
free(fsd);
}
+
+static void write_pixel_2(uint8_t *mem, unsigned int x, unsigned int pixel)
+{
+ unsigned int shift = 6 - 2 * (x & 3);
+ unsigned int mask = 3U << shift;
+
+ mem[x / 4] = (mem[x / 4] & ~mask) | ((pixel << shift) & mask);
+}
+
+static void write_color_2(struct fsd *fsd, uint8_t *mem, unsigned int stride,
+ unsigned int x, unsigned int index)
+{
+ struct drm_color_lut color = smpte_color_lut[index];
+ unsigned int r, g, b;
+
+ fsd_dither(fsd, &color);
+
+ if (color.red >= 32768) {
+ r = 1;
+ color.red = 65535;
+ } else {
+ r = 0;
+ color.red = 0;
+ }
+ if (color.green >= 32768) {
+ g = 2;
+ color.green = 65535;
+ } else {
+ g = 0;
+ color.green = 0;
+ }
+ if (color.blue >= 32768) {
+ b = 3;
+ color.blue = 65535;
+ } else {
+ b = 0;
+ color.blue = 0;
+ }
+
+ fsd_update(fsd, &color);
+
+ /* Use PenTile RG-GB */
+ write_pixel_2(mem, 2 * x, r);
+ write_pixel_2(mem, 2 * x + 1, g);
+ write_pixel_2(mem + stride, 2 * x, g);
+ write_pixel_2(mem + stride, 2 * x + 1, b);
+}
+
+static void fill_smpte_c2(void *mem, unsigned int width, unsigned int height,
+ unsigned int stride)
+{
+ struct fsd *fsd = fsd_alloc(width);
+ unsigned int x;
+ unsigned int y;
+
+ /* Half resolution for PenTile RG-GB */
+ width /= 2;
+ height /= 2;
+
+ for (y = 0; y < height * 6 / 9; ++y) {
+ for (x = 0; x < width; ++x)
+ write_color_2(fsd, mem, stride, x, smpte_top[x * 7 / width]);
+ mem += 2 * stride;
+ }
+
+ for (; y < height * 7 / 9; ++y) {
+ for (x = 0; x < width; ++x)
+ write_color_2(fsd, mem, stride, x, smpte_middle[x * 7 / width]);
+ mem += 2 * stride;
+ }
+
+ for (; y < height; ++y) {
+ for (x = 0; x < width * 5 / 7; ++x)
+ write_color_2(fsd, mem, stride, x,
+ smpte_bottom[x * 4 / (width * 5 / 7)]);
+ for (; x < width * 6 / 7; ++x)
+ write_color_2(fsd, mem, stride, x,
+ smpte_bottom[(x - width * 5 / 7) * 3 /
+ (width / 7) + 4]);
+ for (; x < width; ++x)
+ write_color_2(fsd, mem, stride, x, smpte_bottom[7]);
+ mem += 2 * stride;
+ }
+
+ free(fsd);
+}
+
static void write_pixel_4(uint8_t *mem, unsigned int x, unsigned int pixel)
{
if (x & 1)
@@ -910,9 +997,15 @@ void util_smpte_index_gamma(unsigned size, struct drm_color_lut *lut)
lut[idx].green = (g) * 0x101; \
lut[idx].blue = (b) * 0x101
- if (size < ARRAY_SIZE(smpte_color_lut)) {
+ if (size < 4) {
FILL_COLOR(0, 0, 0, 0 ); /* black */
FILL_COLOR(1, 255, 255, 255); /* white */
+ } else if (size < ARRAY_SIZE(smpte_color_lut)) {
+ /* PenTile RG-GB */
+ FILL_COLOR(0, 0, 0, 0 ); /* black */
+ FILL_COLOR(1, 255, 0, 0 ); /* red */
+ FILL_COLOR(2, 0, 207, 0 ); /* green */
+ FILL_COLOR(3, 0, 0, 255); /* blue */
} else {
memcpy(lut, smpte_color_lut, sizeof(smpte_color_lut));
}
@@ -929,6 +1022,8 @@ static void fill_smpte(const struct util_format_info *info, void *planes[3],
switch (info->format) {
case DRM_FORMAT_C1:
return fill_smpte_c1(planes[0], width, height, stride);
+ case DRM_FORMAT_C2:
+ return fill_smpte_c2(planes[0], width, height, stride);
case DRM_FORMAT_C4:
return fill_smpte_c4(planes[0], width, height, stride);
case DRM_FORMAT_C8:
--
2.25.1
