When I use SDL_BlitSurface on Mac OS X it seems to cause a memory leak, it’s probably in some way related to the way I’m using Blit but anyway I needed a quick hack to get round the problem, performance is not really an issue so I just wrote a function to write the points to the screen one by one:<\/p>\n
There are a bunch of things this version doesn’t do that SDL_BlitSurface does, so beware. It ignores src_rec (just like SDL_BlitSurface would if it were NULL), and it does no conversion to insure source and dest are the same format (so you’ll have to convert the surfaces first).<\/p>\n
\r\nvoid SlowBlitSurface(SDL_Surface *source,SDL_Rect *src_rec,SDL_Surface *dest,SDL_Rect *dest_rec) {\r\n\r\n int sbpp = source->format->BytesPerPixel;\r\n int dbpp = dest->format->BytesPerPixel;\r\n for(size_t x=0;x<source->w;x++) {\r\n for(size_t y=0;y<source->h;y++) {\r\n Uint8 *p = (Uint8 *)source->pixels + (((y * source->w) + x) * sbpp);\r\n Uint32 pval = *(Uint32 *) p;\r\n Uint8 *d = (Uint8 *)dest->pixels + ((((dest_rec->y+y) * (dest->w)) + (dest_rec->x+x)) * dbpp);\r\n *((Uint32 *) d) = pval;\r\n }\r\n }\r\n}\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"When I use SDL_BlitSurface on Mac OS X it seems to cause a memory leak, it’s probably in some way related to the way I’m using Blit but anyway I needed a quick hack to get round the problem, performance is not really an issue so I just wrote a function to write the points […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-647","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1RRoU-ar","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/647","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/comments?post=647"}],"version-history":[{"count":1,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/647\/revisions"}],"predecessor-version":[{"id":648,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/647\/revisions\/648"}],"wp:attachment":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/media?parent=647"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/categories?post=647"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/tags?post=647"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}