It is a drm_fb_xrgb_to_rgb565() variant which checks the clip
rectangle for the destination too.
Common code between drm_fb_xrgb_to_rgb565() and
drm_fb_xrgb_to_rgb565_dstclip() was factored out into the
drm_fb_xrgb_to_rgb565_lines() helper function.
Signed-off-by: Gerd Hoffmann
---
include/drm/drm_format_helper.h | 5 +-
drivers/gpu/drm/drm_format_helper.c | 113
2 files changed, 86 insertions(+), 32 deletions(-)
diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
index c52b7b9a25f0..a84d71fa446b 100644
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -19,9 +19,12 @@ 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_xrgb_to_rgb565(u16 *dst, void *vaddr,
+void drm_fb_xrgb_to_rgb565(void *dst, void *vaddr,
struct drm_framebuffer *fb,
struct drm_rect *clip, bool swap);
+void drm_fb_xrgb_to_rgb565_dstclip(void *dst, unsigned int dst_pitch,
+ void *vaddr, struct drm_framebuffer *fb,
+ struct drm_rect *clip, bool swap);
void drm_fb_xrgb_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip);
diff --git a/drivers/gpu/drm/drm_format_helper.c
b/drivers/gpu/drm/drm_format_helper.c
index 55a2d629a75f..246775510c2e 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -110,6 +110,44 @@ void drm_fb_swab16(u16 *dst, void *vaddr, struct
drm_framebuffer *fb,
}
EXPORT_SYMBOL(drm_fb_swab16);
+static void drm_fb_xrgb_to_rgb565_lines(void *dst, unsigned int dst_pitch,
+ void *src, unsigned int src_pitch,
+ unsigned int src_linelength,
+ unsigned int lines,
+ bool swap)
+{
+ unsigned int linepixels = src_linelength / sizeof(u32);
+ unsigned int x, y;
+ u32 *sbuf;
+ u16 *dbuf, val16;
+
+ /*
+* The cma memory is write-combined so reads are uncached.
+* Speed up by fetching one line at a time.
+*/
+ sbuf = kmalloc(src_linelength, GFP_KERNEL);
+ if (!sbuf)
+ return;
+
+ for (y = 0; y < lines; y++) {
+ memcpy(sbuf, src, src_linelength);
+ dbuf = dst;
+ for (x = 0; x < linepixels; x++) {
+ val16 = ((sbuf[x] & 0x00F8) >> 8) |
+ ((sbuf[x] & 0xFC00) >> 5) |
+ ((sbuf[x] & 0x00F8) >> 3);
+ if (swap)
+ *dbuf++ = swab16(val16);
+ else
+ *dbuf++ = val16;
+ }
+ src += src_pitch;
+ dst += dst_pitch;
+ }
+
+ kfree(sbuf);
+}
+
/**
* drm_fb_xrgb_to_rgb565 - Convert XRGB to RGB565 clip buffer
* @dst: RGB565 destination buffer
@@ -120,45 +158,58 @@ EXPORT_SYMBOL(drm_fb_swab16);
*
* Drivers can use this function for RGB565 devices that don't natively
* support XRGB.
+ *
+ * This function does not apply clipping on dst, i.e. the destination
+ * is a small buffer containing the clip rect only.
*/
-void drm_fb_xrgb_to_rgb565(u16 *dst, void *vaddr,
+void drm_fb_xrgb_to_rgb565(void *dst, void *vaddr,
struct drm_framebuffer *fb,
struct drm_rect *clip, bool swap)
{
- size_t len = (clip->x2 - clip->x1) * sizeof(u32);
- unsigned int x, y;
- u32 *src, *buf;
- u16 val16;
+ unsigned int src_offset = (clip->y1 * fb->pitches[0])
+ + (clip->x1 * sizeof(u32));
+ size_t src_len = (clip->x2 - clip->x1) * sizeof(u32);
+ size_t dst_len = (clip->x2 - clip->x1) * sizeof(u16);
- /*
-* The cma memory is write-combined so reads are uncached.
-* Speed up by fetching one line at a time.
-*/
- buf = kmalloc(len, GFP_KERNEL);
- if (!buf)
- return;
-
- for (y = clip->y1; y < clip->y2; y++) {
- src = vaddr + (y * fb->pitches[0]);
- src += clip->x1;
- memcpy(buf, src, len);
- src = buf;
- for (x = clip->x1; x < clip->x2; x++) {
- val16 = ((*src & 0x00F8) >> 8) |
- ((*src & 0xFC00) >> 5) |
- ((*src & 0x00F8) >> 3);
- src++;
- if (swap)
-
