diff options
Diffstat (limited to 'drivers/gpu/drm/drm_format_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_format_helper.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c index b1be458ed4dd..ecb278b63e8c 100644 --- a/drivers/gpu/drm/drm_format_helper.c +++ b/drivers/gpu/drm/drm_format_helper.c @@ -978,6 +978,75 @@ void drm_fb_xrgb8888_to_gray8(struct iosys_map *dst, const unsigned int *dst_pit } EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8); +static void drm_fb_argb8888_to_argb4444_line(void *dbuf, const void *sbuf, unsigned int pixels) +{ + unsigned int pixels2 = pixels & ~GENMASK_ULL(0, 0); + __le32 *dbuf32 = dbuf; + __le16 *dbuf16 = dbuf + pixels2 * sizeof(*dbuf16); + const __le32 *sbuf32 = sbuf; + unsigned int x; + u32 val32; + u16 val16; + u32 pix[2]; + + for (x = 0; x < pixels2; x += 2, ++dbuf32) { + pix[0] = le32_to_cpu(sbuf32[x]); + pix[1] = le32_to_cpu(sbuf32[x + 1]); + val32 = ((pix[0] & 0xf0000000) >> 16) | + ((pix[0] & 0x00f00000) >> 12) | + ((pix[0] & 0x0000f000) >> 8) | + ((pix[0] & 0x000000f0) >> 4) | + ((pix[1] & 0xf0000000) >> 0) | + ((pix[1] & 0x00f00000) << 4) | + ((pix[1] & 0x0000f000) << 8) | + ((pix[1] & 0x000000f0) << 12); + *dbuf32 = cpu_to_le32(val32); + } + for (; x < pixels; x++) { + pix[0] = le32_to_cpu(sbuf32[x]); + val16 = ((pix[0] & 0xf0000000) >> 16) | + ((pix[0] & 0x00f00000) >> 12) | + ((pix[0] & 0x0000f000) >> 8) | + ((pix[0] & 0x000000f0) >> 4); + dbuf16[x] = cpu_to_le16(val16); + } +} + +/** + * drm_fb_argb8888_to_argb4444 - Convert ARGB8888 to ARGB4444 clip buffer + * @dst: Array of ARGB4444 destination buffers + * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines + * within @dst; can be NULL if scanlines are stored next to each other. + * @src: Array of ARGB8888 source buffer + * @fb: DRM framebuffer + * @clip: Clip rectangle area to copy + * @state: Transform and conversion state + * + * This function copies parts of a framebuffer to display memory and converts + * the color format during the process. The parameters @dst, @dst_pitch and + * @src refer to arrays. Each array must have at least as many entries as + * there are planes in @fb's format. Each entry stores the value for the + * format's respective color plane at the same index. + * + * This function does not apply clipping on @dst (i.e. the destination is at the + * top-left corner). + * + * Drivers can use this function for ARGB4444 devices that don't support + * ARGB8888 natively. + */ +void drm_fb_argb8888_to_argb4444(struct iosys_map *dst, const unsigned int *dst_pitch, + const struct iosys_map *src, const struct drm_framebuffer *fb, + const struct drm_rect *clip, struct drm_format_conv_state *state) +{ + static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = { + 2, + }; + + drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false, state, + drm_fb_argb8888_to_argb4444_line); +} +EXPORT_SYMBOL(drm_fb_argb8888_to_argb4444); + /** * drm_fb_blit - Copy parts of a framebuffer to display memory * @dst: Array of display-memory addresses to copy to |