t* My version of sent
URI git clone git://git.codevoid.de/sent-sdk.git
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
DIR commit 0798e82d2326fc330168733997006020cc59e215
DIR parent b516f468faa3a80c31932cbcb1ea8ccd1468ffc1
URI Author: Markus Teich <markus.teich@stusta.mhn.de>
Date: Tue, 8 Dec 2015 21:46:18 +0100
support transparent images
Diffstat:
M sent.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
---
DIR diff --git a/sent.c b/sent.c
t@@ -215,6 +215,8 @@ int ffread(Image *img)
{
uint32_t y, x;
uint16_t *row;
+ uint8_t opac;
+ uint8_t fg_r, fg_g, fg_b, bg_r, bg_g, bg_b;
size_t rowlen, off, nbytes;
ssize_t r;
t@@ -239,6 +241,11 @@ int ffread(Image *img)
return 0;
}
+ /* extract window background color channels for transparency */
+ bg_r = (sc->bg.pix >> 16) % 256;
+ bg_g = (sc->bg.pix >> 8) % 256;
+ bg_b = (sc->bg.pix >> 0) % 256;
+
for (off = 0, y = 0; y < img->bufheight; y++) {
nbytes = 0;
while (nbytes < rowlen) {
t@@ -248,9 +255,15 @@ int ffread(Image *img)
nbytes += r;
}
for (x = 0; x < rowlen / 2; x += 4) {
- img->buf[off++] = ntohs(row[x + 0]) / 257;
- img->buf[off++] = ntohs(row[x + 1]) / 257;
- img->buf[off++] = ntohs(row[x + 2]) / 257;
+ fg_r = ntohs(row[x + 0]) / 256;
+ fg_g = ntohs(row[x + 1]) / 256;
+ fg_b = ntohs(row[x + 2]) / 256;
+ opac = ntohs(row[x + 3]) / 256;
+ /* blend opaque part of image data with window background color to
+ * emulate transparency */
+ img->buf[off++] = (fg_r * opac + bg_r * (255 - opac)) / 256;
+ img->buf[off++] = (fg_g * opac + bg_g * (255 - opac)) / 256;
+ img->buf[off++] = (fg_b * opac + bg_b * (255 - opac)) / 256;
}
}