Implemented for drawing fonts, the C1-to-XRGB8888 blitting code writes
single bits into an XRGB8888-based buffer. The color is read from the
given palette.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/drm_format_helper.c | 39 +++++++++++++++++++++++++++++
include/drm/drm_format_helper.h | 2 ++
2 files changed, 41 insertions(+)
diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
index 2588871672b6d..a61f45636a111 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -462,6 +462,45 @@ static void drm_fb_xrgb8888_to_rgb332_line(void *dbuf, const void *sbuf, unsigne
}
}
+static void drm_fb_c1_to_xrgb8888_line(void *dbuf, const void *sbuf, unsigned int pixels,
+ const struct drm_color_lut *palette)
+{
+ __le32 *dbuf32 = dbuf;
+ const __le32 *sbuf32 = sbuf;
+ unsigned int shift = 0;
+ unsigned int x;
+ u32 pix;
+ u32 bit;
+ u32 val32;
+
+ for (x = 0; x < pixels; x++) {
+ if (!shift) {
+ pix = le32_to_cpu(sbuf32[x / 32]);
+ shift = 32;
+ }
+ --shift;
+ bit = (pix >> shift) & BIT(0);
+
+ val32 = GENMASK(31, 24) |
+ ((palette[bit].red >> 8) << 16) |
+ ((palette[bit].green >> 8) << 8) |
+ ((palette[bit].blue >> 8));
+ dbuf32[x] = cpu_to_le32(val32);
+ }
+}
+
+void drm_fb_c1_to_xrgb8888(struct iosys_map *dst, const unsigned int *dst_pitch,
+ const struct drm_pixmap *src_pix, struct drm_format_conv_state *state)
+{
+ static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
+ 4,
+ };
+
+ drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src_pix, false, state,
+ drm_fb_c1_to_xrgb8888_line);
+}
+EXPORT_SYMBOL(drm_fb_c1_to_xrgb8888);
+
/**
* drm_fb_xrgb8888_to_rgb332 - Convert XRGB8888 to RGB332 clip buffer
* @dst: Array of RGB332 destination buffers
diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
index 464812080f3dc..d5ee8bdb0f619 100644
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -109,6 +109,8 @@ void drm_fb_swab(struct drm_device *dev,
struct iosys_map *dst, const unsigned int *dst_pitch,
const struct drm_pixmap *src_pix, bool cached,
struct drm_format_conv_state *state);
+void drm_fb_c1_to_xrgb8888(struct iosys_map *dst, const unsigned int *dst_pitch,
+ const struct drm_pixmap *src_pix, struct drm_format_conv_state *state);
void drm_fb_xrgb8888_to_rgb332(struct iosys_map *dst, const unsigned int *dst_pitch,
const struct drm_pixmap *src_pix, struct drm_format_conv_state *state);
void drm_fb_xrgb8888_to_rgb565(struct iosys_map *dst, const unsigned int *dst_pitch,
--
2.43.0
