fix [#28430] Image with Stampinfo does not get saved correctly with alpha

1 files changed, 8 insertions, 1 deletions

diff --git a/source/blender/blenfont/intern/blf_font.c b/source/blender/blenfont/intern/blf_font.c
index 708b3708ab7..fb6505fe935 100644
--- a/source/blender/blenfont/intern/blf_font.c
+++ b/source/blender/blenfont/intern/blf_font.c
@@ -213,7 +213,7 @@ void blf_font_buffer(FontBLF *font, const char *str)
 {
 	unsigned char *cbuf;
 	unsigned int c;
-	unsigned char b_col_char[3];
+	unsigned char b_col_char[4];
 	GlyphBLF *g, *g_prev;
 	FT_Vector delta;
 	FT_UInt glyph_index;
@@ -232,6 +232,7 @@ void blf_font_buffer(FontBLF *font, const char *str)
 	b_col_char[0]= font->b_col[0] * 255;
 	b_col_char[1]= font->b_col[1] * 255;
 	b_col_char[2]= font->b_col[2] * 255;
+	b_col_char[3]= font->b_col[3] * 255;
 
 	while (str[i]) {
 		int pen_y;
@@ -296,16 +297,19 @@ void blf_font_buffer(FontBLF *font, const char *str)
 						a= *(g->bitmap + x + (yb * g->pitch)) / 255.0f;
 
 						if(a > 0.0f) {
+							float alphatest;
 							fbuf= font->b_fbuf + font->bch * ((chx + x) + ((pen_y + y)*font->bw));
 							if (a >= 1.0f) {
 								fbuf[0]= font->b_col[0];
 								fbuf[1]= font->b_col[1];
 								fbuf[2]= font->b_col[2];
+								fbuf[3]= (alphatest= (fbuf[3] + (font->b_col[3]))) < 1.0f ? alphatest : 1.0f;
 							}
 							else {
 								fbuf[0]= (font->b_col[0]*a) + (fbuf[0] * (1-a));
 								fbuf[1]= (font->b_col[1]*a) + (fbuf[1] * (1-a));
 								fbuf[2]= (font->b_col[2]*a) + (fbuf[2] * (1-a));
+								fbuf[3]= (alphatest= (fbuf[3] + (font->b_col[3]*a))) < 1.0f ? alphatest : 1.0f;
 							}
 						}
 					}
@@ -324,16 +328,19 @@ void blf_font_buffer(FontBLF *font, const char *str)
 						a= *(g->bitmap + x + (yb * g->pitch)) / 255.0f;
 
 						if(a > 0.0f) {
+							int alphatest;
 							cbuf= font->b_cbuf + font->bch * ((chx + x) + ((pen_y + y)*font->bw));
 							if (a >= 1.0f) {
 								cbuf[0]= b_col_char[0];
 								cbuf[1]= b_col_char[1];
 								cbuf[2]= b_col_char[2];
+								cbuf[3]= (alphatest= ((int)cbuf[3] + (int)b_col_char[3])) < 255 ? alphatest : 255;
 							}
 							else {
 								cbuf[0]= (b_col_char[0]*a) + (cbuf[0] * (1-a));
 								cbuf[1]= (b_col_char[1]*a) + (cbuf[1] * (1-a));
 								cbuf[2]= (b_col_char[2]*a) + (cbuf[2] * (1-a));
+								cbuf[3]= (alphatest= ((int)cbuf[3] + (int)((font->b_col[3]*a)*255.0f))) < 255 ? alphatest : 255;
 							}
 						}
 					}