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drm: add drm_fb_memcpy_dstclip() helper 

It is a drm_fb_memcpy() variant which checks the clip rectangle for the
destination too.

Common code between drm_fb_memcpy() and drm_fb_memcpy_dstclip() was
factored out into the drm_fb_memcpy_lines() helper function.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20190405095219.9231-3-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2019-04-05 11:52:16 +02:00
parent 7415287e1f
commit 26f024f54a
2 changed files with 45 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
drivers/gpu/drm/drm_format_helper.c
View File

@ -16,30 +16,65 @@
#include <drm/drm_fourcc.h>
#include <drm/drm_rect.h>
static void drm_fb_memcpy_lines(void *dst, unsigned int dst_pitch,
void *src, unsigned int src_pitch,
unsigned int linelength, unsigned int lines)
{
int line;
for (line = 0; line < lines; line++) {
memcpy(dst, src, linelength);
src += src_pitch;
dst += dst_pitch;
}
}
/**
* drm_fb_memcpy - Copy clip buffer
* @dst: Destination buffer
* @vaddr: Source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* This function does not apply clipping on dst, i.e. the destination
* is a small buffer containing the clip rect only.
*/
void drm_fb_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip)
{
unsigned int cpp = drm_format_plane_cpp(fb->format->format, 0);
unsigned int pitch = fb->pitches[0];
void *src = vaddr + (clip->y1 * pitch) + (clip->x1 * cpp);
unsigned int offset = (clip->y1 * fb->pitches[0]) + (clip->x1 * cpp);
size_t len = (clip->x2 - clip->x1) * cpp;
unsigned int y;
for (y = clip->y1; y < clip->y2; y++) {
memcpy(dst, src, len);
src += pitch;
dst += len;
}
drm_fb_memcpy_lines(dst, len,
vaddr + offset, fb->pitches[0],
len, clip->y2 - clip->y1);
}
EXPORT_SYMBOL(drm_fb_memcpy);
/**
* drm_fb_memcpy_dstclip - Copy clip buffer
* @dst: Destination buffer
* @vaddr: Source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* This function applies clipping on dst, i.e. the destination is a
* full framebuffer but only the clip rect content is copied over.
*/
void drm_fb_memcpy_dstclip(void *dst, void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip)
{
unsigned int cpp = drm_format_plane_cpp(fb->format->format, 0);
unsigned int offset = (clip->y1 * fb->pitches[0]) + (clip->x1 * cpp);
size_t len = (clip->x2 - clip->x1) * cpp;
drm_fb_memcpy_lines(dst + offset, fb->pitches[0],
vaddr + offset, fb->pitches[0],
len, clip->y2 - clip->y1);
}
EXPORT_SYMBOL(drm_fb_memcpy_dstclip);
/**
* drm_fb_swab16 - Swap bytes into clip buffer
* @dst: RGB565 destination buffer

2
include/drm/drm_format_helper.h
View File

@ -15,6 +15,8 @@ struct drm_rect;
void drm_fb_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip);
void drm_fb_memcpy_dstclip(void *dst, void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip);
void drm_fb_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip);
void drm_fb_xrgb8888_to_rgb565(u16 *dst, void *vaddr,