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Subject[PATCH v3 4/5] drm: add drm_fb_xrgb8888_to_rgb888_dstclip()
Date
Simliar to drm_fb_xrgb8888_to_rgb565_dstclip() but converts to rgb888
instead of rgb565.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
include/drm/drm_format_helper.h | 3 ++
drivers/gpu/drm/drm_format_helper.c | 60 +++++++++++++++++++++++++++++
2 files changed, 63 insertions(+)

diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
index a84d71fa446b..6f84380757ee 100644
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -25,6 +25,9 @@ void drm_fb_xrgb8888_to_rgb565(void *dst, void *vaddr,
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_rgb888_dstclip(void *dst, unsigned int dst_pitch,
+ void *vaddr, struct drm_framebuffer *fb,
+ struct drm_rect *clip);
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 246775510c2e..00d716f14173 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -210,6 +210,66 @@ void drm_fb_xrgb8888_to_rgb565_dstclip(void *dst, unsigned int dst_pitch,
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565_dstclip);

+static void drm_fb_xrgb8888_to_rgb888_lines(void *dst, unsigned int dst_pitch,
+ void *src, unsigned int src_pitch,
+ unsigned int src_linelength,
+ unsigned int lines)
+{
+ unsigned int linepixels = src_linelength / 3;
+ unsigned int x, y;
+ u32 *sbuf;
+ u8 *dbuf;
+
+ 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++) {
+ *dbuf++ = (sbuf[x] & 0x000000FF) >> 0;
+ *dbuf++ = (sbuf[x] & 0x0000FF00) >> 8;
+ *dbuf++ = (sbuf[x] & 0x00FF0000) >> 16;
+ }
+ src += src_pitch;
+ dst += dst_pitch;
+ }
+
+ kfree(sbuf);
+}
+
+/**
+ * drm_fb_xrgb8888_to_rgb888_dstclip - Convert XRGB8888 to RGB888 clip buffer
+ * @dst: RGB565 destination buffer
+ * @dst_pitch: destination buffer pitch
+ * @vaddr: XRGB8888 source buffer
+ * @fb: DRM framebuffer
+ * @clip: Clip rectangle area to copy
+ * @dstclip: Clip destination too.
+ *
+ * Drivers can use this function for RGB888 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_rgb888_dstclip(void *dst, unsigned int dst_pitch,
+ void *vaddr, struct drm_framebuffer *fb,
+ struct drm_rect *clip)
+{
+ unsigned int src_offset = (clip->y1 * fb->pitches[0])
+ + (clip->x1 * sizeof(u32));
+ unsigned int dst_offset = (clip->y1 * dst_pitch)
+ + (clip->x1 * 3);
+ size_t src_len = (clip->x2 - clip->x1) * sizeof(u32);
+
+ drm_fb_xrgb8888_to_rgb888_lines(dst + dst_offset, dst_pitch,
+ vaddr + src_offset, fb->pitches[0],
+ src_len, clip->y2 - clip->y1);
+}
+EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_dstclip);
+
/**
* drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
* @dst: 8-bit grayscale destination buffer
--
2.18.1
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