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Subject[PATCH 2/4] drm: use convert_lines() in xrgb8888_to_rgb565 helpers.
Date
Also add two conversion functions for the swab / not swab cases.
That way we have to check the swab flag only once.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
drivers/gpu/drm/drm_format_helper.c | 117 +++++++++++++++-------------
1 file changed, 62 insertions(+), 55 deletions(-)

diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
index f32e0173600c..b8d17cd0a9f8 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -38,6 +38,46 @@ static struct drm_format_convert convert_swab16 = {
.func = convert_swab16_fn,
};

+static void convert_xrgb8888_to_rgb565_fn(void *dst, void *src, u32 pixels)
+{
+ u32 *sbuf = src;
+ u16 *dbuf = dst;
+ u32 x;
+
+ for (x = 0; x < pixels; x++) {
+ dbuf[x] = ((sbuf[x] & 0x00F80000) >> 8) |
+ ((sbuf[x] & 0x0000FC00) >> 5) |
+ ((sbuf[x] & 0x000000F8) >> 3);
+ }
+}
+
+static struct drm_format_convert convert_xrgb8888_to_rgb565 = {
+ .dst_cpp = 2,
+ .src_cpp = 4,
+ .func = convert_xrgb8888_to_rgb565_fn,
+};
+
+static void convert_xrgb8888_to_rgb565_swab_fn(void *dst, void *src, u32 pixels)
+{
+ u32 *sbuf = src;
+ u16 *dbuf = dst;
+ u16 val16;
+ u32 x;
+
+ for (x = 0; x < pixels; x++) {
+ val16 = ((sbuf[x] & 0x00F80000) >> 8) |
+ ((sbuf[x] & 0x0000FC00) >> 5) |
+ ((sbuf[x] & 0x000000F8) >> 3);
+ dbuf[x] = swab16(val16);
+ }
+}
+
+static struct drm_format_convert convert_xrgb8888_to_rgb565_swap = {
+ .dst_cpp = 2,
+ .src_cpp = 4,
+ .func = convert_xrgb8888_to_rgb565_swab_fn,
+};
+
static void convert_lines(void *dst, unsigned int dst_pitch,
void *src, unsigned int src_pitch,
unsigned int pixels,
@@ -152,44 +192,6 @@ 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
@@ -208,15 +210,17 @@ void drm_fb_xrgb8888_to_rgb565(void *dst, 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));
- size_t src_len = (clip->x2 - clip->x1) * sizeof(u32);
- size_t dst_len = (clip->x2 - clip->x1) * sizeof(u16);
+ struct drm_format_convert *conv = swap
+ ? &convert_xrgb8888_to_rgb565_swap
+ : &convert_xrgb8888_to_rgb565;
+ unsigned int src_offset =
+ clip_offset(clip, fb->pitches[0], conv->src_cpp);
+ size_t pixels = (clip->x2 - clip->x1);
+ size_t lines = (clip->y2 - clip->y1);

- drm_fb_xrgb8888_to_rgb565_lines(dst, dst_len,
- vaddr + src_offset, fb->pitches[0],
- src_len, clip->y2 - clip->y1,
- swap);
+ convert_lines(dst, pixels * conv->dst_cpp,
+ vaddr + src_offset, fb->pitches[0],
+ pixels, lines, conv);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);

@@ -239,16 +243,19 @@ 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);
+ struct drm_format_convert *conv = swap
+ ? &convert_xrgb8888_to_rgb565_swap
+ : &convert_xrgb8888_to_rgb565;
+ unsigned int src_offset =
+ clip_offset(clip, fb->pitches[0], conv->src_cpp);
+ unsigned int dst_offset =
+ clip_offset(clip, dst_pitch, conv->dst_cpp);
+ size_t pixels = (clip->x2 - clip->x1);
+ size_t lines = (clip->y2 - clip->y1);

- drm_fb_xrgb8888_to_rgb565_lines(dst + dst_offset, dst_pitch,
- vaddr + src_offset, fb->pitches[0],
- src_len, clip->y2 - clip->y1,
- swap);
+ convert_lines(dst + dst_offset, dst_pitch,
+ vaddr + src_offset, fb->pitches[0],
+ pixels, lines, conv);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565_dstclip);

--
2.18.1
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