.u = MAKE_YUV_601_U(r, g, b), \
.v = MAKE_YUV_601_V(r, g, b) }
-static inline uint32_t shiftcolor(const struct util_color_component *comp,
+/* This function takes 8-bit color values */
+static inline uint32_t shiftcolor8(const struct util_color_component *comp,
uint32_t value)
{
+ value &= 0xff;
/* Fill the low bits with the high bits. */
value = (value << 8) | value;
/* Shift down to remove unwanted low bits */
return value << comp->offset;
}
+/* This function takes 10-bit color values */
+static inline uint32_t shiftcolor10(const struct util_color_component *comp,
+ uint32_t value)
+{
+ value &= 0x3ff;
+ /* Fill the low bits with the high bits. */
+ value = (value << 6) | (value >> 4);
+ /* Shift down to remove unwanted low bits */
+ value = value >> (16 - comp->length);
+ /* Shift back up to where the value should be */
+ return value << comp->offset;
+}
+
+#define MAKE_RGBA10(rgb, r, g, b, a) \
+ (shiftcolor10(&(rgb)->red, (r)) | \
+ shiftcolor10(&(rgb)->green, (g)) | \
+ shiftcolor10(&(rgb)->blue, (b)) | \
+ shiftcolor10(&(rgb)->alpha, (a)))
+
#define MAKE_RGBA(rgb, r, g, b, a) \
- (shiftcolor(&(rgb)->red, (r)) | \
- shiftcolor(&(rgb)->green, (g)) | \
- shiftcolor(&(rgb)->blue, (b)) | \
- shiftcolor(&(rgb)->alpha, (a)))
+ (shiftcolor8(&(rgb)->red, (r)) | \
+ shiftcolor8(&(rgb)->green, (g)) | \
+ shiftcolor8(&(rgb)->blue, (b)) | \
+ shiftcolor8(&(rgb)->alpha, (a)))
#define MAKE_RGB24(rgb, r, g, b) \
{ .value = MAKE_RGBA(rgb, r, g, b, 0) }
memset(planes[0], 0x77, stride * height);
}
+static void fill_gradient_rgb32(const struct util_rgb_info *rgb,
+ void *mem,
+ unsigned int width, unsigned int height,
+ unsigned int stride)
+{
+ int i, j;
+
+ for (i = 0; i < height / 2; i++) {
+ uint32_t *row = mem;
+
+ for (j = 0; j < width / 2; j++) {
+ uint32_t value = MAKE_RGBA10(rgb, j & 0x3ff, j & 0x3ff, j & 0x3ff, 0);
+ row[2*j] = row[2*j+1] = value;
+ }
+ mem += stride;
+ }
+
+ for (; i < height; i++) {
+ uint32_t *row = mem;
+
+ for (j = 0; j < width / 2; j++) {
+ uint32_t value = MAKE_RGBA10(rgb, j & 0x3fc, j & 0x3fc, j & 0x3fc, 0);
+ row[2*j] = row[2*j+1] = value;
+ }
+ mem += stride;
+ }
+}
+
+/* The gradient pattern creates two horizontal gray gradients, split
+ * into two halves. The top half has 10bpc precision, the bottom half
+ * has 8bpc precision. When using with a 10bpc fb format, there are 3
+ * possible outcomes:
+ *
+ * - Pixel data is encoded as 8bpc to the display, no dithering. This
+ * would lead to the top and bottom halves looking identical.
+ *
+ * - Pixel data is encoded as 8bpc to the display, with dithering. This
+ * would lead to there being a visible difference between the two halves,
+ * but the top half would look a little speck-y due to the dithering.
+ *
+ * - Pixel data is encoded at 10bpc+ to the display (which implies
+ * the display is able to show this level of depth). This should
+ * lead to the top half being a very clean gradient, and visibly different
+ * from the bottom half.
+ *
+ * Once we support additional fb formats, this approach could be extended
+ * to distinguish even higher bpc precisions.
+ *
+ * Note that due to practical size considerations, for the screens
+ * where this matters, the pattern actually emits stripes 2-pixels
+ * wide for each gradient color. Otherwise the difference may be a bit
+ * hard to notice.
+ */
+static void fill_gradient(const struct util_format_info *info, void *planes[3],
+ unsigned int width, unsigned int height,
+ unsigned int stride)
+{
+ switch (info->format) {
+ case DRM_FORMAT_ARGB8888:
+ case DRM_FORMAT_XRGB8888:
+ case DRM_FORMAT_ABGR8888:
+ case DRM_FORMAT_XBGR8888:
+ case DRM_FORMAT_RGBA8888:
+ case DRM_FORMAT_RGBX8888:
+ case DRM_FORMAT_BGRA8888:
+ case DRM_FORMAT_BGRX8888:
+ case DRM_FORMAT_ARGB2101010:
+ case DRM_FORMAT_XRGB2101010:
+ case DRM_FORMAT_ABGR2101010:
+ case DRM_FORMAT_XBGR2101010:
+ case DRM_FORMAT_RGBA1010102:
+ case DRM_FORMAT_RGBX1010102:
+ case DRM_FORMAT_BGRA1010102:
+ case DRM_FORMAT_BGRX1010102:
+ return fill_gradient_rgb32(&info->rgb, planes[0],
+ width, height, stride);
+ }
+}
+
/*
* util_fill_pattern - Fill a buffer with a test pattern
* @format: Pixel format
case UTIL_PATTERN_PLAIN:
return fill_plain(planes, height, stride);
+ case UTIL_PATTERN_GRADIENT:
+ return fill_gradient(info, planes, width, height, stride);
+
default:
printf("Error: unsupported test pattern %u.\n", pattern);
break;