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Use separate background image for alpha layer; fixes issue #132

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This commit is contained in:
Bert Münnich 2014-02-06 22:04:19 +01:00
parent 72f1b1ca6f
commit 4fde8c8cbc
2 changed files with 31 additions and 9 deletions
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2
Makefile
View file

@ -1,4 +1,4 @@
VERSION = git-20140205 VERSION = git-20140206
PREFIX = /usr/local PREFIX = /usr/local
MANPREFIX = $(PREFIX)/share/man MANPREFIX = $(PREFIX)/share/man

38
image.c
View file

@ -441,6 +441,8 @@ void img_render(img_t *img)
win_t *win; win_t *win;
int sx, sy, sw, sh; int sx, sy, sw, sh;
int dx, dy, dw, dh; int dx, dy, dw, dh;
Imlib_Image bg;
unsigned long c;
if (img == NULL || img->im == NULL || img->win == NULL) if (img == NULL || img->im == NULL || img->win == NULL)
return; return;
@ -456,8 +458,11 @@ void img_render(img_t *img)
if (!img->dirty) if (!img->dirty)
return; return;
/* calculate source and destination offsets */ /* calculate source and destination offsets:
if (img->x < 0) { * - part of image drawn on full window, or
* - full image drawn on part of window
*/
if (img->x <= 0) {
sx = -img->x / img->zoom; sx = -img->x / img->zoom;
sw = win->w / img->zoom; sw = win->w / img->zoom;
dx = 0; dx = 0;
@ -468,7 +473,7 @@ void img_render(img_t *img)
dx = img->x; dx = img->x;
dw = img->w * img->zoom; dw = img->w * img->zoom;
} }
if (img->y < 0) { if (img->y <= 0) {
sy = -img->y / img->zoom; sy = -img->y / img->zoom;
sh = win->h / img->zoom; sh = win->h / img->zoom;
dy = 0; dy = 0;
@ -484,13 +489,30 @@ void img_render(img_t *img)
imlib_context_set_image(img->im); imlib_context_set_image(img->im);
imlib_context_set_anti_alias(img->aa); imlib_context_set_anti_alias(img->aa);
if (!img->alpha && imlib_image_has_alpha())
win_draw_rect(win, win->pm, dx, dy, dw, dh, True, 0, win->white);
imlib_context_set_drawable(win->pm); imlib_context_set_drawable(win->pm);
imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
if (imlib_image_has_alpha()) {
bg = imlib_create_image(dw, dh);
imlib_context_set_image(bg);
imlib_image_set_has_alpha(0);
if (img->alpha)
c = win->fullscreen ? win->fscol : win->bgcol;
else
c = win->white;
imlib_context_set_color(c >> 16 & 0xFF, c >> 8 & 0xFF, c & 0xFF, 0xFF);
imlib_image_fill_rectangle(0, 0, dw, dh);
imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);
imlib_context_set_color_modifier(NULL);
imlib_render_image_on_drawable(dx, dy);
imlib_free_image();
if (img->gamma != 0)
imlib_context_set_color_modifier(img->cmod);
} else {
imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
}
img->dirty = false; img->dirty = false;
} }