From 7bef64490f9bb04731d3cf46bc8f7f46e55b2e0e Mon Sep 17 00:00:00 2001 From: Thomas Zimmermann Date: Mon, 8 Aug 2022 14:54:03 +0200 Subject: drm/format-helper: Rework XRGB8888-to-GRAY8 conversion MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Update XRGB8888-to-GRAY8 conversion to support struct iosys_map and convert all users. Although these are single-plane color formats, the new interface supports multi-plane formats for consistency with drm_fb_blit(). v2: * update documentation (Sam) * add TODO on vaddr location (Sam) Signed-off-by: Thomas Zimmermann Tested-by: Noralf Trønnes Reviewed-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20220808125406.20752-12-tzimmermann@suse.de --- drivers/gpu/drm/drm_format_helper.c | 46 +++++++++++++++++++++++++++---------- 1 file changed, 34 insertions(+), 12 deletions(-) (limited to 'drivers/gpu/drm/drm_format_helper.c') diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c index 795d845c7e53..890370c0424f 100644 --- a/drivers/gpu/drm/drm_format_helper.c +++ b/drivers/gpu/drm/drm_format_helper.c @@ -613,25 +613,47 @@ static void drm_fb_xrgb8888_to_gray8_line(void *dbuf, const void *sbuf, unsigned /** * drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale - * @dst: 8-bit grayscale destination buffer - * @dst_pitch: Number of bytes between two consecutive scanlines within dst - * @vaddr: XRGB8888 source buffer + * @dst: Array of 8-bit grayscale 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. + * @vmap: Array of XRGB8888 source buffers * @fb: DRM framebuffer * @clip: Clip rectangle area to copy * - * Drm doesn't have native monochrome or grayscale support. - * Such drivers can announce the commonly supported XR24 format to userspace - * and use this function to convert to the native format. + * This function copies parts of a framebuffer to display memory and converts the + * color format during the process. Destination and framebuffer formats must match. The + * parameters @dst, @dst_pitch and @vmap 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. * - * Monochrome drivers will use the most significant bit, - * where 1 means foreground color and 0 background color. + * This function does not apply clipping on @dst (i.e. the destination is at the + * top-left corner). * - * ITU BT.601 is used for the RGB -> luma (brightness) conversion. + * DRM doesn't have native monochrome or grayscale support. Drivers can use this + * function for grayscale devices that don't support XRGB8888 natively.Such + * drivers can announce the commonly supported XR24 format to userspace and use + * this function to convert to the native format. Monochrome drivers will use the + * most significant bit, where 1 means foreground color and 0 background color. + * ITU BT.601 is being used for the RGB -> luma (brightness) conversion. */ -void drm_fb_xrgb8888_to_gray8(void *dst, unsigned int dst_pitch, const void *vaddr, - const struct drm_framebuffer *fb, const struct drm_rect *clip) +void drm_fb_xrgb8888_to_gray8(struct iosys_map *dst, const unsigned int *dst_pitch, + const struct iosys_map *vmap, const struct drm_framebuffer *fb, + const struct drm_rect *clip) { - drm_fb_xfrm(dst, dst_pitch, 1, vaddr, fb, clip, false, drm_fb_xrgb8888_to_gray8_line); + static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = { + 0, 0, 0, 0 + }; + + if (!dst_pitch) + dst_pitch = default_dst_pitch; + + /* TODO: handle vmap in I/O memory here */ + if (dst[0].is_iomem) + drm_fb_xfrm_toio(dst[0].vaddr_iomem, dst_pitch[0], 1, vmap[0].vaddr, fb, + clip, false, drm_fb_xrgb8888_to_gray8_line); + else + drm_fb_xfrm(dst[0].vaddr, dst_pitch[0], 1, vmap[0].vaddr, fb, + clip, false, drm_fb_xrgb8888_to_gray8_line); } EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8); -- cgit v1.2.3