lkml.org 
[lkml]   [2019]   [Apr]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 3/5] drm: add drm_fb_xrgb8888_to_rgb565_dstclip()
Date
It is a drm_fb_xrgb8888_to_rgb565() variant which checks the clip
rectangle for the destination too.

Common code between drm_fb_xrgb8888_to_rgb565() and
drm_fb_xrgb8888_to_rgb565_dstclip() was factored out into the
drm_fb_xrgb8888_to_rgb565_lines() helper function.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
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_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
+void drm_fb_xrgb8888_to_rgb565(void *dst, void *vaddr,
struct drm_framebuffer *fb,
struct drm_rect *clip, bool swap);
+void drm_fb_xrgb8888_to_rgb565_dstclip(void *dst, unsigned int dst_pitch,
+ void *vaddr, struct drm_framebuffer *fb,
+ struct drm_rect *clip, bool swap);
void drm_fb_xrgb8888_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_xrgb8888_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] & 0x00F80000) >> 8) |
+ ((sbuf[x] & 0x0000FC00) >> 5) |
+ ((sbuf[x] & 0x000000F8) >> 3);
+ if (swap)
+ *dbuf++ = swab16(val16);
+ else
+ *dbuf++ = val16;
+ }
+ src += src_pitch;
+ dst += dst_pitch;
+ }
+
+ kfree(sbuf);
+}
+
/**
* drm_fb_xrgb8888_to_rgb565 - Convert XRGB8888 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 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_rgb565(u16 *dst, void *vaddr,
+void drm_fb_xrgb8888_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 & 0x00F80000) >> 8) |
- ((*src & 0x0000FC00) >> 5) |
- ((*src & 0x000000F8) >> 3);
- src++;
- if (swap)
- *dst++ = swab16(val16);
- else
- *dst++ = val16;
- }
- }
-
- kfree(buf);
+ drm_fb_xrgb8888_to_rgb565_lines(dst, dst_len,
+ vaddr + src_offset, fb->pitches[0],
+ src_len, clip->y2 - clip->y1,
+ swap);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);

+/**
+ * drm_fb_xrgb8888_to_rgb565_dstclip - Convert XRGB8888 to RGB565 clip buffer
+ * @dst: RGB565 destination buffer
+ * @dst_pitch: destination buffer pitch
+ * @vaddr: XRGB8888 source buffer
+ * @fb: DRM framebuffer
+ * @clip: Clip rectangle area to copy
+ * @swap: Swap bytes
+ *
+ * Drivers can use this function for RGB565 devices that don't natively
+ * support XRGB8888.
+ *
+ * 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_xrgb8888_to_rgb565_dstclip(void *dst, unsigned int dst_pitch,
+ void *vaddr, struct drm_framebuffer *fb,
+ struct drm_rect *clip, bool swap)
+{
+ unsigned int src_offset = (clip->y1 * fb->pitches[0])
+ + (clip->x1 * sizeof(u32));
+ unsigned int dst_offset = (clip->y1 * dst_pitch)
+ + (clip->x1 * sizeof(u16));
+ size_t src_len = (clip->x2 - clip->x1) * sizeof(u32);
+
+ drm_fb_xrgb8888_to_rgb565_lines(dst + dst_offset, dst_pitch,
+ vaddr + src_offset, fb->pitches[0],
+ src_len, clip->y2 - clip->y1,
+ swap);
+}
+EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565_dstclip);
+
/**
* drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
* @dst: 8-bit grayscale destination buffer
--
2.18.1
\
 
 \ /
  Last update: 2019-04-05 11:55    [W:0.031 / U:29.448 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site