diff options
| author | Noralf Trønnes <noralf@tronnes.org> | 2021-09-29 21:11:57 +0200 |
|---|---|---|
| committer | Noralf Trønnes <noralf@tronnes.org> | 2021-10-04 12:03:46 +0200 |
| commit | cee0b7cbf1c02fc1e32a9eda6a66f1a4f85adae9 (patch) | |
| tree | 785200d402f29de86bde91eb3c1d8c7f79d3dc65 /drivers/gpu/drm/drm_format_helper.c | |
| parent | a0b1d355b9b4e24833f6d5c0e03bdf61a34b9963 (diff) | |
drm/format-helper: Add drm_fb_xrgb8888_to_rgb332()
Add XRGB8888 emulation support for devices that can only do RGB332.
v2:
- Support Big Endian (Daniel)
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210929191201.34456-3-noralf@tronnes.org
Diffstat (limited to 'drivers/gpu/drm/drm_format_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_format_helper.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c index 5231104b1498..dab4f382d469 100644 --- a/drivers/gpu/drm/drm_format_helper.c +++ b/drivers/gpu/drm/drm_format_helper.c @@ -135,6 +135,56 @@ void drm_fb_swab(void *dst, void *src, struct drm_framebuffer *fb, } EXPORT_SYMBOL(drm_fb_swab); +static void drm_fb_xrgb8888_to_rgb332_line(u8 *dbuf, __le32 *sbuf, unsigned int pixels) +{ + unsigned int x; + u32 pix; + + for (x = 0; x < pixels; x++) { + pix = le32_to_cpu(sbuf[x]); + dbuf[x] = ((pix & 0x00e00000) >> 16) | + ((pix & 0x0000e000) >> 11) | + ((pix & 0x000000c0) >> 6); + } +} + +/** + * drm_fb_xrgb8888_to_rgb332 - Convert XRGB8888 to RGB332 clip buffer + * @dst: RGB332 destination buffer + * @src: XRGB8888 source buffer + * @fb: DRM framebuffer + * @clip: Clip rectangle area to copy + * + * Drivers can use this function for RGB332 devices that don't natively support XRGB8888. + * + * This function does not apply clipping on dst, i.e. the destination is a small buffer + * containing the clip rect only. + */ +void drm_fb_xrgb8888_to_rgb332(void *dst, void *src, struct drm_framebuffer *fb, + struct drm_rect *clip) +{ + size_t width = drm_rect_width(clip); + size_t src_len = width * sizeof(u32); + unsigned int y; + void *sbuf; + + /* Use a buffer to speed up access on buffers with uncached read mapping (i.e. WC) */ + sbuf = kmalloc(src_len, GFP_KERNEL); + if (!sbuf) + return; + + src += clip_offset(clip, fb->pitches[0], sizeof(u32)); + for (y = 0; y < drm_rect_height(clip); y++) { + memcpy(sbuf, src, src_len); + drm_fb_xrgb8888_to_rgb332_line(dst, sbuf, width); + src += fb->pitches[0]; + dst += width; + } + + kfree(sbuf); +} +EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb332); + static void drm_fb_xrgb8888_to_rgb565_line(u16 *dbuf, u32 *sbuf, unsigned int pixels, bool swab) |