From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: barebox@lists.infradead.org
Subject: [PATCH 08/11] graphic_utils: add rgba support
Date: Wed, 12 Sep 2012 15:42:46 +0200 [thread overview]
Message-ID: <1347457369-9215-8-git-send-email-plagnioj@jcrosoft.com> (raw)
In-Reply-To: <1347457369-9215-1-git-send-email-plagnioj@jcrosoft.com>
this will allow to render rgba image with or without hw support
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
include/graphic_utils.h | 3 ++
lib/graphic_utils.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 105 insertions(+)
diff --git a/include/graphic_utils.h b/include/graphic_utils.h
index 4e5596f..9909b6c 100644
--- a/include/graphic_utils.h
+++ b/include/graphic_utils.h
@@ -7,8 +7,11 @@
#ifndef __GRAPHIC_UTILS_H__
#define __GRAPHIC_UTILS_H__
+void rgba_blend(struct fb_info *info, void *image, void* dest, int height,
+ int width, int startx, int starty, bool is_rgba);
void set_pixel(struct fb_info *info, void *adr, u32 px);
void set_rgb_pixel(struct fb_info *info, void *adr, u8 r, u8 g, u8 b);
+void set_rgba_pixel(struct fb_info *info, void *adr, u8 r, u8 g, u8 b, u8 a);
void memset_pixel(struct fb_info *info, void* buf, u32 color, size_t size);
#endif /* __GRAPHIC_UTILS_H__ */
diff --git a/lib/graphic_utils.c b/lib/graphic_utils.c
index 672992c..a435bdd 100644
--- a/lib/graphic_utils.c
+++ b/lib/graphic_utils.c
@@ -62,6 +62,37 @@ void memset_pixel(struct fb_info *info, void* buf, u32 color, size_t size)
}
}
+static void get_rgb_pixel(struct fb_info *info, void *adr, u8 *r ,u8 *g, u8 *b)
+{
+ u32 px;
+ u32 rmask, gmask, bmask;
+
+ switch (info->bits_per_pixel) {
+ case 16:
+ px = *(u16 *)adr;
+ break;
+ case 32:
+ px = *(u32 *)adr;
+ break;
+ case 8:
+ default:
+ return;
+ }
+
+ rmask = (0xff >> (8 - info->blue.length)) << info->blue.offset |
+ (0xff >> (8 - info->green.length)) << info->green.offset;
+
+ gmask = (0xff >> (8 - info->red.length)) << info->red.offset |
+ (0xff >> (8 - info->blue.length)) << info->blue.offset;
+
+ bmask = (0xff >> (8 - info->red.length)) << info->red.offset |
+ (0xff >> (8 - info->green.length)) << info->green.offset;
+
+ *r = ((px & ~rmask) >> info->red.offset) << (8 - info->red.length);
+ *g = ((px & ~gmask) >> info->green.offset) << (8 - info->green.length);
+ *b = ((px & ~bmask) >> info->blue.offset) << (8 - info->blue.length);
+}
+
void set_pixel(struct fb_info *info, void *adr, u32 px)
{
switch (info->bits_per_pixel) {
@@ -87,3 +118,74 @@ void set_rgb_pixel(struct fb_info *info, void *adr, u8 r, u8 g, u8 b)
set_pixel(info, adr, px);
}
+static u8 alpha_mux(int s, int d, int a)
+{
+ return (d * a + s * (255 - a)) >> 8;
+}
+
+void set_rgba_pixel(struct fb_info *info, void *adr, u8 r, u8 g, u8 b, u8 a)
+{
+ u32 px = 0x0;
+
+ if (!a)
+ return;
+
+ if (a != 0xff) {
+ if (info->transp.length) {
+ px |= (a >> (8 - info->transp.length)) << info->transp.offset;
+ } else {
+ u8 sr = 0;
+ u8 sg = 0;
+ u8 sb = 0;
+
+ get_rgb_pixel(info, adr, &sr, &sg, &sb);
+
+ r = alpha_mux(sr, r, a);
+ g = alpha_mux(sg, g, a);
+ b = alpha_mux(sb, b, a);
+
+ set_rgb_pixel(info, adr, r, g, b);
+
+ return;
+ }
+ }
+
+ px |= (r >> (8 - info->red.length)) << info->red.offset |
+ (g >> (8 - info->green.length)) << info->green.offset |
+ (b >> (8 - info->blue.length)) << info->blue.offset;
+
+ set_pixel(info, adr, px);
+}
+
+void rgba_blend(struct fb_info *info, void *image, void* buf, int height,
+ int width, int startx, int starty, bool is_rgba)
+{
+ unsigned char *adr;
+ int x, y;
+ int xres;
+ int img_byte_per_pixel = 3;
+
+ if (is_rgba)
+ img_byte_per_pixel++;
+
+ xres = info->xres;
+
+ for (y = 0; y < height; y++) {
+ adr = buf + ((y + starty) * xres + startx) *
+ (info->bits_per_pixel >> 3);
+
+ for (x = 0; x < width; x++) {
+ char *pixel;
+
+ pixel = image;
+ if (is_rgba)
+ set_rgba_pixel(info, adr, pixel[0], pixel[1],
+ pixel[2], pixel[3]);
+ else
+ set_rgb_pixel(info, adr, pixel[0], pixel[1],
+ pixel[2]);
+ adr += info->bits_per_pixel >> 3;
+ image += img_byte_per_pixel;
+ }
+ }
+}
--
1.7.10.4
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next prev parent reply other threads:[~2012-09-12 13:49 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-12 13:24 [PATCH 00/11 v4] add PNG support Jean-Christophe PLAGNIOL-VILLARD
2012-09-12 13:42 ` [PATCH 01/11] bmp: rename it to splash Jean-Christophe PLAGNIOL-VILLARD
2012-09-12 13:42 ` [PATCH 02/11] bmp: split bmp rending in lib/bmp.c Jean-Christophe PLAGNIOL-VILLARD
2012-09-12 15:08 ` Sascha Hauer
2012-09-12 15:18 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-12 15:24 ` Sascha Hauer
2012-09-12 13:42 ` [PATCH 03/11] Introduce graphic utils Jean-Christophe PLAGNIOL-VILLARD
2012-09-12 13:42 ` [PATCH 04/11] introduce image_renderer framework Jean-Christophe PLAGNIOL-VILLARD
2012-09-12 13:42 ` [PATCH 05/11] filetype: add BMP support Jean-Christophe PLAGNIOL-VILLARD
2012-09-12 15:13 ` Sascha Hauer
2012-09-12 13:42 ` [PATCH 06/11] splash/bmp: switch to image_renderer Jean-Christophe PLAGNIOL-VILLARD
2012-09-12 13:42 ` [PATCH 07/11] splash: add support to set a background color Jean-Christophe PLAGNIOL-VILLARD
2012-09-12 13:42 ` Jean-Christophe PLAGNIOL-VILLARD [this message]
2012-09-12 13:42 ` [PATCH 09/11] filetype: add PNG support Jean-Christophe PLAGNIOL-VILLARD
2012-09-12 15:14 ` Sascha Hauer
2012-09-12 13:42 ` [PATCH 10/11] " Jean-Christophe PLAGNIOL-VILLARD
2012-09-12 13:42 ` [PATCH 11/11] png: add picoPNG lib support Jean-Christophe PLAGNIOL-VILLARD
-- strict thread matches above, loose matches on Subject: below --
2012-09-08 18:03 [PATCH 00/11 v3] add PNG support Jean-Christophe PLAGNIOL-VILLARD
2012-09-08 18:05 ` [PATCH 01/11] bmp: rename it to splash Jean-Christophe PLAGNIOL-VILLARD
2012-09-08 18:05 ` [PATCH 08/11] graphic_utils: add rgba support Jean-Christophe PLAGNIOL-VILLARD
2012-09-07 13:07 [PATCH 00/11 v2] add PNG support Jean-Christophe PLAGNIOL-VILLARD
2012-09-07 13:10 ` [PATCH 01/11] bmp: rename it to splash Jean-Christophe PLAGNIOL-VILLARD
2012-09-07 13:10 ` [PATCH 08/11] graphic_utils: add rgba support Jean-Christophe PLAGNIOL-VILLARD
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