Fix drawing text on >2gig buffers (stamp for eg)

1 files changed, 11 insertions, 4 deletions

diff --git a/source/blender/blenfont/intern/blf_font.c b/source/blender/blenfont/intern/blf_font.c
index 8f8ee445ef9..2057b0f6bbf 100644
--- a/source/blender/blenfont/intern/blf_font.c
+++ b/source/blender/blenfont/intern/blf_font.c
@@ -286,10 +286,9 @@ void blf_font_buffer(FontBLF *font, const char *str)
 	    (unsigned char)(buf_info->col[2] * 255),
 	    (unsigned char)(buf_info->col[3] * 255)};
 
-	unsigned char *cbuf;
 	int chx, chy;
 	int y, x;
-	float a, *fbuf;
+	float a;
 
 	BLF_KERNING_VARS(font, has_kerning, kern_mode);
 
@@ -349,8 +348,12 @@ void blf_font_buffer(FontBLF *font, const char *str)
 						a = *(g->bitmap + x + (yb * g->pitch)) / 255.0f;
 
 						if (a > 0.0f) {
+							const size_t buf_ofs = (
+							        ((size_t)(chx + x) + ((size_t)(pen_y + y) * (size_t)buf_info->w)) *
+							        (size_t)buf_info->ch);
+							float *fbuf = buf_info->fbuf + buf_ofs;
 							float alphatest;
-							fbuf = buf_info->fbuf + buf_info->ch * ((chx + x) + ((pen_y + y) * buf_info->w));
+
 							if (a >= 1.0f) {
 								fbuf[0] = b_col_float[0];
 								fbuf[1] = b_col_float[1];
@@ -380,8 +383,12 @@ void blf_font_buffer(FontBLF *font, const char *str)
 						a = *(g->bitmap + x + (yb * g->pitch)) / 255.0f;
 
 						if (a > 0.0f) {
+							const size_t buf_ofs = (
+							        ((size_t)(chx + x) + ((size_t)(pen_y + y) * (size_t)buf_info->w)) *
+							        (size_t)buf_info->ch);
+							unsigned char *cbuf = buf_info->cbuf + buf_ofs;
 							int alphatest;
-							cbuf = buf_info->cbuf + buf_info->ch * ((chx + x) + ((pen_y + y) * buf_info->w));
+
 							if (a >= 1.0f) {
 								cbuf[0] = b_col_char[0];
 								cbuf[1] = b_col_char[1];