Add greyscale Y8 format. The 8-bit greyscale format has been discussed before, and the earlier guidance was to use DRM_FORMAT_R8, as a single-channel 8-bit pixel. However, adding DRM_FORMAT_Y8 makes sense, we can mark it as 'is_yuv' in the drm_format_info, and this can help the drivers handle e.g. full/limited range. This will distinguish two single-channel formats: R8, which is a RGB format with the same value for all components, and Y8, which is a Y-only YCbCr format, with Cb and Cr being neutral.
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| @@ -441,6 +441,15 @@ extern "C" { · 440 unmodified lines | |||
| 441 | #define DRM_FORMAT_YUV444 fourcc_code('Y', 'U', '2', '4') /* non-subsampled Cb (1) and Cr (2) planes */ | 441 | #define DRM_FORMAT_YUV444 fourcc_code('Y', 'U', '2', '4') /* non-subsampled Cb (1) and Cr (2) planes */ |
| 442 | #define DRM_FORMAT_YVU444 fourcc_code('Y', 'V', '2', '4') /* non-subsampled Cr (1) and Cb (2) planes */ | 442 | #define DRM_FORMAT_YVU444 fourcc_code('Y', 'V', '2', '4') /* non-subsampled Cr (1) and Cb (2) planes */ |
| 443 | 443 | ||
| 444 | /* | ||
| 445 | * Y-only (greyscale) formats | ||
| 446 | * | ||
| 447 | * The Y-only formats are handled similarly to the YCbCr formats in the display | ||
| 448 | * pipeline, with the Cb and Cr implicitly neutral (0.0 in nominal values). This | ||
| 449 | * also means that COLOR_RANGE property applies to the Y-only formats. | ||
| 450 | */ | ||
| 451 | |||
| 452 | #define DRM_FORMAT_Y8 fourcc_code('G', 'R', 'E', 'Y') /* 8-bit Y-only */ | ||
| 444 | 453 | ||
| 445 | /* | 454 | /* |
| 446 | * Format Modifiers: | 455 | * Format Modifiers: |