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drm/format-helper: Add drm_fb_xrgb8888_to_gray8_line()
Pull the per-line conversion logic into a separate helper function. This will allow to do line-by-line conversion in other helpers that convert to a gray8 format. Suggested-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Maxime Ripard <maxime@cerno.tech> Link: https://patchwork.freedesktop.org/patch/msgid/20220214133710.3278506-2-javierm@redhat.com
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1 changed files with 19 additions and 12 deletions
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@ -464,6 +464,21 @@ void drm_fb_xrgb8888_to_xrgb2101010_toio(void __iomem *dst,
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}
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EXPORT_SYMBOL(drm_fb_xrgb8888_to_xrgb2101010_toio);
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static void drm_fb_xrgb8888_to_gray8_line(u8 *dst, const u32 *src, unsigned int pixels)
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{
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unsigned int x;
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for (x = 0; x < pixels; x++) {
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u8 r = (*src & 0x00ff0000) >> 16;
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u8 g = (*src & 0x0000ff00) >> 8;
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u8 b = *src & 0x000000ff;
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/* ITU BT.601: Y = 0.299 R + 0.587 G + 0.114 B */
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*dst++ = (3 * r + 6 * g + b) / 10;
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src++;
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}
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}
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/**
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* drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
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* @dst: 8-bit grayscale destination buffer
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@ -484,8 +499,9 @@ EXPORT_SYMBOL(drm_fb_xrgb8888_to_xrgb2101010_toio);
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void drm_fb_xrgb8888_to_gray8(void *dst, unsigned int dst_pitch, const void *vaddr,
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const struct drm_framebuffer *fb, const struct drm_rect *clip)
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{
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unsigned int len = (clip->x2 - clip->x1) * sizeof(u32);
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unsigned int x, y;
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unsigned int linepixels = clip->x2 - clip->x1;
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unsigned int len = linepixels * sizeof(u32);
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unsigned int y;
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void *buf;
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u8 *dst8;
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u32 *src32;
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@ -508,16 +524,7 @@ void drm_fb_xrgb8888_to_gray8(void *dst, unsigned int dst_pitch, const void *vad
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for (y = clip->y1; y < clip->y2; y++) {
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dst8 = dst;
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src32 = memcpy(buf, vaddr, len);
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for (x = clip->x1; x < clip->x2; x++) {
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u8 r = (*src32 & 0x00ff0000) >> 16;
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u8 g = (*src32 & 0x0000ff00) >> 8;
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u8 b = *src32 & 0x000000ff;
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/* ITU BT.601: Y = 0.299 R + 0.587 G + 0.114 B */
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*dst8++ = (3 * r + 6 * g + b) / 10;
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src32++;
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}
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drm_fb_xrgb8888_to_gray8_line(dst8, src32, linepixels);
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vaddr += fb->pitches[0];
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dst += dst_pitch;
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}
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