@@ -100,17 +100,35 @@ typedef void (*pixel_read_line_t)(const struct vkms_plane_state *plane, int x_st
int y_start, enum pixel_read_direction direction, int count,
struct pixel_argb_u16 out_pixel[]);
+/**
+ * struct conversion_matrix - Matrix to use for a specific encoding and range
+ *
+ * @matrix: Conversion matrix from yuv to rgb. The matrix is stored in a row-major manner and is
+ * used to compute rgb values from yuv values:
+ * [[r],[g],[b]] = @matrix * [[y],[u],[v]]
+ * OR for yvu formats:
+ * [[r],[g],[b]] = @matrix * [[y],[v],[u]]
+ * The values of the matrix are signed fixed-point values with 32 bits fractional part.
+ * @y_offset: Offset to apply on the y value.
+ */
+struct conversion_matrix {
+ s64 matrix[3][3];
+ int y_offset;
+};
+
/**
* struct vkms_plane_state - Driver specific plane state
* @base: base plane state
* @frame_info: data required for composing computation
* @pixel_read_line: function to read a pixel line in this plane. The creator of a
* struct vkms_plane_state must ensure that this pointer is valid
+ * @conversion_matrix: matrix used for yuv formats to convert to rgb
*/
struct vkms_plane_state {
struct drm_shadow_plane_state base;
struct vkms_frame_info *frame_info;
pixel_read_line_t pixel_read_line;
+ struct conversion_matrix conversion_matrix;
};
struct vkms_plane {
@@ -140,6 +140,51 @@ static void packed_pixels_addr_1x1(const struct vkms_frame_info *frame_info,
*addr = (u8 *)frame_info->map[0].vaddr + offset;
}
+/**
+ * get_subsampling() - Get the subsampling divisor value on a specific direction
+ *
+ * @format: format to extarct the subsampling from
+ * @direction: direction of the subsampling requested
+ */
+static int get_subsampling(const struct drm_format_info *format,
+ enum pixel_read_direction direction)
+{
+ switch (direction) {
+ case READ_BOTTOM_TO_TOP:
+ case READ_TOP_TO_BOTTOM:
+ return format->vsub;
+ case READ_RIGHT_TO_LEFT:
+ case READ_LEFT_TO_RIGHT:
+ return format->hsub;
+ }
+ WARN_ONCE(true, "Invalid direction for pixel reading: %d\n", direction);
+ return 1;
+}
+
+/**
+ * get_subsampling_offset() - An offset for keeping the chroma siting consistent regardless of
+ * x_start and y_start values
+ *
+ * @direction: direction of the reading to properly compute this offset
+ * @x_start: x coordinate of the starting point of the readed line
+ * @y_start: y coordinate of the starting point of the readed line
+ */
+static int get_subsampling_offset(enum pixel_read_direction direction, int x_start, int y_start)
+{
+ switch (direction) {
+ case READ_BOTTOM_TO_TOP:
+ return -y_start - 1;
+ case READ_TOP_TO_BOTTOM:
+ return y_start;
+ case READ_RIGHT_TO_LEFT:
+ return -x_start - 1;
+ case READ_LEFT_TO_RIGHT:
+ return x_start;
+ }
+ WARN_ONCE(true, "Invalid direction for pixel reading: %d\n", direction);
+ return 0;
+}
+
/*
* The following functions take pixel data (a, r, g, b, pixel, ...) and convert them to
* &struct pixel_argb_u16
@@ -202,6 +247,38 @@ static struct pixel_argb_u16 argb_u16_from_RGB565(const __le16 *pixel)
return out_pixel;
}
+static struct pixel_argb_u16 argb_u16_from_yuv888(u8 y, u8 channel_1, u8 channel_2,
+ const struct conversion_matrix *matrix)
+{
+ u16 r, g, b;
+ s64 fp_y, fp_channel_1, fp_channel_2;
+ s64 fp_r, fp_g, fp_b;
+
+ fp_y = drm_int2fixp(((int)y - matrix->y_offset) * 257);
+ fp_channel_1 = drm_int2fixp(((int)channel_1 - 128) * 257);
+ fp_channel_2 = drm_int2fixp(((int)channel_2 - 128) * 257);
+
+ fp_r = drm_fixp_mul(matrix->matrix[0][0], fp_y) +
+ drm_fixp_mul(matrix->matrix[0][1], fp_channel_1) +
+ drm_fixp_mul(matrix->matrix[0][2], fp_channel_2);
+ fp_g = drm_fixp_mul(matrix->matrix[1][0], fp_y) +
+ drm_fixp_mul(matrix->matrix[1][1], fp_channel_1) +
+ drm_fixp_mul(matrix->matrix[1][2], fp_channel_2);
+ fp_b = drm_fixp_mul(matrix->matrix[2][0], fp_y) +
+ drm_fixp_mul(matrix->matrix[2][1], fp_channel_1) +
+ drm_fixp_mul(matrix->matrix[2][2], fp_channel_2);
+
+ fp_r = drm_fixp2int_round(fp_r);
+ fp_g = drm_fixp2int_round(fp_g);
+ fp_b = drm_fixp2int_round(fp_b);
+
+ r = clamp(fp_r, 0, 0xffff);
+ g = clamp(fp_g, 0, 0xffff);
+ b = clamp(fp_b, 0, 0xffff);
+
+ return argb_u16_from_u16161616(0xffff, r, g, b);
+}
+
/*
* The following functions are read_line function for each pixel format supported by VKMS.
*
@@ -311,6 +388,92 @@ static void RGB565_read_line(const struct vkms_plane_state *plane, int x_start,
}
}
+/*
+ * This callback can be used for YUV formats where U and V values are
+ * stored in the same plane (often called semi-planar formats). It will
+ * correctly handle subsampling as described in the drm_format_info of the plane.
+ *
+ * The conversion matrix stored in the @plane is used to:
+ * - Apply the correct color range and encoding
+ * - Convert YUV and YVU with the same function (a column swap is needed when setting up
+ * plane->conversion_matrix)
+ */
+static void semi_planar_yuv_read_line(const struct vkms_plane_state *plane, int x_start,
+ int y_start, enum pixel_read_direction direction, int count,
+ struct pixel_argb_u16 out_pixel[])
+{
+ u8 *y_plane;
+ u8 *uv_plane;
+
+ packed_pixels_addr_1x1(plane->frame_info, x_start, y_start, 0,
+ &y_plane);
+ packed_pixels_addr_1x1(plane->frame_info,
+ x_start / plane->frame_info->fb->format->hsub,
+ y_start / plane->frame_info->fb->format->vsub, 1,
+ &uv_plane);
+ int step_y = get_block_step_bytes(plane->frame_info->fb, direction, 0);
+ int step_uv = get_block_step_bytes(plane->frame_info->fb, direction, 1);
+ int subsampling = get_subsampling(plane->frame_info->fb->format, direction);
+ int subsampling_offset = get_subsampling_offset(direction, x_start, y_start);
+ const struct conversion_matrix *conversion_matrix = &plane->conversion_matrix;
+
+ for (int i = 0; i < count; i++) {
+ *out_pixel = argb_u16_from_yuv888(y_plane[0], uv_plane[0], uv_plane[1],
+ conversion_matrix);
+ out_pixel += 1;
+ y_plane += step_y;
+ if ((i + subsampling_offset + 1) % subsampling == 0)
+ uv_plane += step_uv;
+ }
+}
+
+/*
+ * This callback can be used for YUV format where each color component is
+ * stored in a different plane (often called planar formats). It will
+ * correctly handle subsampling as described in the drm_format_info of the plane.
+ *
+ * The conversion matrix stored in the @plane is used to:
+ * - Apply the correct color range and encoding
+ * - Convert YUV and YVU with the same function (a column swap is needed when setting up
+ * plane->conversion_matrix)
+ */
+static void planar_yuv_read_line(const struct vkms_plane_state *plane, int x_start,
+ int y_start, enum pixel_read_direction direction, int count,
+ struct pixel_argb_u16 out_pixel[])
+{
+ u8 *y_plane;
+ u8 *channel_1_plane;
+ u8 *channel_2_plane;
+
+ packed_pixels_addr_1x1(plane->frame_info, x_start, y_start, 0,
+ &y_plane);
+ packed_pixels_addr_1x1(plane->frame_info,
+ x_start / plane->frame_info->fb->format->hsub,
+ y_start / plane->frame_info->fb->format->vsub, 1,
+ &channel_1_plane);
+ packed_pixels_addr_1x1(plane->frame_info,
+ x_start / plane->frame_info->fb->format->hsub,
+ y_start / plane->frame_info->fb->format->vsub, 2,
+ &channel_2_plane);
+ int step_y = get_block_step_bytes(plane->frame_info->fb, direction, 0);
+ int step_channel_1 = get_block_step_bytes(plane->frame_info->fb, direction, 1);
+ int step_channel_2 = get_block_step_bytes(plane->frame_info->fb, direction, 2);
+ int subsampling = get_subsampling(plane->frame_info->fb->format, direction);
+ int subsampling_offset = get_subsampling_offset(direction, x_start, y_start);
+ const struct conversion_matrix *conversion_matrix = &plane->conversion_matrix;
+
+ for (int i = 0; i < count; i++) {
+ *out_pixel = argb_u16_from_yuv888(*y_plane, *channel_1_plane, *channel_2_plane,
+ conversion_matrix);
+ out_pixel += 1;
+ y_plane += step_y;
+ if ((i + subsampling_offset + 1) % subsampling == 0) {
+ channel_1_plane += step_channel_1;
+ channel_2_plane += step_channel_2;
+ }
+ }
+}
+
/*
* The following functions take one &struct pixel_argb_u16 and convert it to a specific format.
* The result is stored in @out_pixel.
@@ -426,6 +589,20 @@ pixel_read_line_t get_pixel_read_line_function(u32 format)
return &XRGB16161616_read_line;
case DRM_FORMAT_RGB565:
return &RGB565_read_line;
+ case DRM_FORMAT_NV12:
+ case DRM_FORMAT_NV16:
+ case DRM_FORMAT_NV24:
+ case DRM_FORMAT_NV21:
+ case DRM_FORMAT_NV61:
+ case DRM_FORMAT_NV42:
+ return &semi_planar_yuv_read_line;
+ case DRM_FORMAT_YUV420:
+ case DRM_FORMAT_YUV422:
+ case DRM_FORMAT_YUV444:
+ case DRM_FORMAT_YVU420:
+ case DRM_FORMAT_YVU422:
+ case DRM_FORMAT_YVU444:
+ return &planar_yuv_read_line;
default:
/*
* This is a bug in vkms_plane_atomic_check(). All the supported
@@ -439,6 +616,183 @@ pixel_read_line_t get_pixel_read_line_function(u32 format)
}
}
+/*
+ * Those matrices were generated using the colour python framework
+ *
+ * Below are the function calls used to generate each matrix, go to
+ * https://colour.readthedocs.io/en/develop/generated/colour.matrix_YCbCr.html
+ * for more info:
+ *
+ * numpy.around(colour.matrix_YCbCr(K=colour.WEIGHTS_YCBCR["ITU-R BT.601"],
+ * is_legal = False,
+ * bits = 8) * 2**32).astype(int)
+ */
+static const struct conversion_matrix no_operation = {
+ .matrix = {
+ { 4294967296, 0, 0, },
+ { 0, 4294967296, 0, },
+ { 0, 0, 4294967296, },
+ },
+ .y_offset = 0,
+};
+
+static const struct conversion_matrix yuv_bt601_full = {
+ .matrix = {
+ { 4294967296, 0, 6021544149 },
+ { 4294967296, -1478054095, -3067191994 },
+ { 4294967296, 7610682049, 0 },
+ },
+ .y_offset = 0,
+};
+
+/*
+ * numpy.around(colour.matrix_YCbCr(K=colour.WEIGHTS_YCBCR["ITU-R BT.601"],
+ * is_legal = True,
+ * bits = 8) * 2**32).astype(int)
+ */
+static const struct conversion_matrix yuv_bt601_limited = {
+ .matrix = {
+ { 5020601039, 0, 6881764740 },
+ { 5020601039, -1689204679, -3505362278 },
+ { 5020601039, 8697922339, 0 },
+ },
+ .y_offset = 16,
+};
+
+/*
+ * numpy.around(colour.matrix_YCbCr(K=colour.WEIGHTS_YCBCR["ITU-R BT.709"],
+ * is_legal = False,
+ * bits = 8) * 2**32).astype(int)
+ */
+static const struct conversion_matrix yuv_bt709_full = {
+ .matrix = {
+ { 4294967296, 0, 6763714498 },
+ { 4294967296, -804551626, -2010578443 },
+ { 4294967296, 7969741314, 0 },
+ },
+ .y_offset = 0,
+};
+
+/*
+ * numpy.around(colour.matrix_YCbCr(K=colour.WEIGHTS_YCBCR["ITU-R BT.709"],
+ * is_legal = True,
+ * bits = 8) * 2**32).astype(int)
+ */
+static const struct conversion_matrix yuv_bt709_limited = {
+ .matrix = {
+ { 5020601039, 0, 7729959424 },
+ { 5020601039, -919487572, -2297803934 },
+ { 5020601039, 9108275786, 0 },
+ },
+ .y_offset = 16,
+};
+
+/*
+ * numpy.around(colour.matrix_YCbCr(K=colour.WEIGHTS_YCBCR["ITU-R BT.2020"],
+ * is_legal = False,
+ * bits = 8) * 2**32).astype(int)
+ */
+static const struct conversion_matrix yuv_bt2020_full = {
+ .matrix = {
+ { 4294967296, 0, 6333358775 },
+ { 4294967296, -706750298, -2453942994 },
+ { 4294967296, 8080551471, 0 },
+ },
+ .y_offset = 0,
+};
+
+/*
+ * numpy.around(colour.matrix_YCbCr(K=colour.WEIGHTS_YCBCR["ITU-R BT.2020"],
+ * is_legal = True,
+ * bits = 8) * 2**32).astype(int)
+ */
+static const struct conversion_matrix yuv_bt2020_limited = {
+ .matrix = {
+ { 5020601039, 0, 7238124312 },
+ { 5020601039, -807714626, -2804506279 },
+ { 5020601039, 9234915964, 0 },
+ },
+ .y_offset = 16,
+};
+
+/**
+ * swap_uv_columns() - Swap u and v column of a given matrix
+ *
+ * @matrix: Matrix in which column are swapped
+ */
+static void swap_uv_columns(struct conversion_matrix *matrix)
+{
+ swap(matrix->matrix[0][2], matrix->matrix[0][1]);
+ swap(matrix->matrix[1][2], matrix->matrix[1][1]);
+ swap(matrix->matrix[2][2], matrix->matrix[2][1]);
+}
+
+/**
+ * get_conversion_matrix_to_argb_u16() - Retrieve the correct yuv to rgb conversion matrix for a
+ * given encoding and range.
+ *
+ * @format: DRM_FORMAT_* value for which to obtain a conversion function (see [drm_fourcc.h])
+ * @encoding: DRM_COLOR_* value for which to obtain a conversion matrix
+ * @range: DRM_COLOR_*_RANGE value for which to obtain a conversion matrix
+ * @matrix: Pointer to store the value into
+ */
+void get_conversion_matrix_to_argb_u16(u32 format,
+ enum drm_color_encoding encoding,
+ enum drm_color_range range,
+ struct conversion_matrix *matrix)
+{
+ const struct conversion_matrix *matrix_to_copy;
+ bool limited_range;
+
+ switch (range) {
+ case DRM_COLOR_YCBCR_LIMITED_RANGE:
+ limited_range = true;
+ break;
+ case DRM_COLOR_YCBCR_FULL_RANGE:
+ limited_range = false;
+ break;
+ case DRM_COLOR_RANGE_MAX:
+ limited_range = false;
+ WARN_ONCE(true, "The requested range is not supported.");
+ break;
+ }
+
+ switch (encoding) {
+ case DRM_COLOR_YCBCR_BT601:
+ matrix_to_copy = limited_range ? &yuv_bt601_limited :
+ &yuv_bt601_full;
+ break;
+ case DRM_COLOR_YCBCR_BT709:
+ matrix_to_copy = limited_range ? &yuv_bt709_limited :
+ &yuv_bt709_full;
+ break;
+ case DRM_COLOR_YCBCR_BT2020:
+ matrix_to_copy = limited_range ? &yuv_bt2020_limited :
+ &yuv_bt2020_full;
+ break;
+ case DRM_COLOR_ENCODING_MAX:
+ matrix_to_copy = &no_operation;
+ WARN_ONCE(true, "The requested encoding is not supported.");
+ break;
+ }
+
+ memcpy(matrix, matrix_to_copy, sizeof(*matrix_to_copy));
+
+ switch (format) {
+ case DRM_FORMAT_YVU420:
+ case DRM_FORMAT_YVU422:
+ case DRM_FORMAT_YVU444:
+ case DRM_FORMAT_NV21:
+ case DRM_FORMAT_NV61:
+ case DRM_FORMAT_NV42:
+ swap_uv_columns(matrix);
+ break;
+ default:
+ break;
+ }
+}
+EXPORT_SYMBOL(get_conversion_matrix_to_argb_u16);
+
/**
* get_pixel_write_function() - Retrieve the correct write_pixel function for a specific format.
* The returned pointer is NULL for unsupported pixel formats. The caller must ensure that the
@@ -9,4 +9,8 @@ pixel_read_line_t get_pixel_read_line_function(u32 format);
pixel_write_t get_pixel_write_function(u32 format);
+void get_conversion_matrix_to_argb_u16(u32 format, enum drm_color_encoding encoding,
+ enum drm_color_range range,
+ struct conversion_matrix *matrix);
+
#endif /* _VKMS_FORMATS_H_ */
@@ -17,7 +17,19 @@ static const u32 vkms_formats[] = {
DRM_FORMAT_XRGB8888,
DRM_FORMAT_XRGB16161616,
DRM_FORMAT_ARGB16161616,
- DRM_FORMAT_RGB565
+ DRM_FORMAT_RGB565,
+ DRM_FORMAT_NV12,
+ DRM_FORMAT_NV16,
+ DRM_FORMAT_NV24,
+ DRM_FORMAT_NV21,
+ DRM_FORMAT_NV61,
+ DRM_FORMAT_NV42,
+ DRM_FORMAT_YUV420,
+ DRM_FORMAT_YUV422,
+ DRM_FORMAT_YUV444,
+ DRM_FORMAT_YVU420,
+ DRM_FORMAT_YVU422,
+ DRM_FORMAT_YVU444,
};
static struct drm_plane_state *
@@ -118,6 +130,8 @@ static void vkms_plane_atomic_update(struct drm_plane *plane,
frame_info->rotation = new_state->rotation;
vkms_plane_state->pixel_read_line = get_pixel_read_line_function(fmt);
+ get_conversion_matrix_to_argb_u16(fmt, new_state->color_encoding, new_state->color_range,
+ &vkms_plane_state->conversion_matrix);
}
static int vkms_plane_atomic_check(struct drm_plane *plane,