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Use pre-multiplied alpha for cairo rendering 

Signed-off-by: Julien Danjou <julien@danjou.info>
This commit is contained in:
Julien Danjou 2008-03-24 10:26:35 +01:00
parent 822fe535e3
commit 8b411eb15d
1 changed files with 14 additions and 15 deletions
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27
common/draw.c
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@ -578,7 +578,8 @@ void draw_image_from_argb_data(DrawCtx *ctx, int x, int y, int w, int h,
cairo_t *cr;
cairo_surface_t *source;
source = cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32, w, h, 0);
source = cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32, w, h,
cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, w));
cr = cairo_create(ctx->surface);
if(wanted_h > 0 && h > 0)
{
@ -645,9 +646,10 @@ draw_imlib_load_strerror(Imlib_Load_Error e)
void
draw_image(DrawCtx *ctx, int x, int y, int wanted_h, const char *filename)
{
int w, h, size;
int w, h, size, i;
DATA32 *data;
unsigned char *dataimg;
double alpha;
unsigned char *dataimg, *rdataimg;
Imlib_Image image;
Imlib_Load_Error e = IMLIB_LOAD_ERROR_NONE;
@ -662,25 +664,22 @@ draw_image(DrawCtx *ctx, int x, int y, int wanted_h, const char *filename)
data = imlib_image_get_data_for_reading_only();
dataimg = p_new(unsigned char, size * 4);
rdataimg = dataimg = p_new(unsigned char, size * 4);
memcpy(dataimg, data, size * 4);
#if 0
/* Alternate method */
for(i = 0; i < size; i++, dataimg += 4)
{
dataimg[3] = (data[i] >> 24) & 0xff; /* A */
dataimg[2] = (data[i] >> 16) & 0xff; /* R */
dataimg[1] = (data[i] >> 8) & 0xff; /* G */
dataimg[0] = data[i] & 0xff; /* B */
/* cairo wants pre-multiplied alpha */
alpha = dataimg[3] / 255.0;
dataimg[2] = ((data[i] >> 16) & 0xff) * alpha; /* R */
dataimg[1] = ((data[i] >> 8) & 0xff) * alpha; /* G */
dataimg[0] = (data[i] & 0xff) * alpha; /* B */
}
#endif
draw_image_from_argb_data(ctx, x, y, w, h, wanted_h, dataimg);
draw_image_from_argb_data(ctx, x, y, w, h, wanted_h, rdataimg);
imlib_free_image();
p_delete(&dataimg);
p_delete(&rdataimg);
}
/** Get an image size