c++ - SDL TTF 库内存泄漏(每帧创建和释放曲面)

Question

我正在为我正在制作的游戏创建一个基本的 SDL+OpenGL 关卡编辑器，在创建动态 TTF 表面，然后将它们转换为 OpenGL 纹理时，我遇到了一些非常严重的内存泄漏。

例如:

每一帧，我都运行一些如下所示的代码:

shape_label = SDL_DisplayFormat(TTF_RenderText_Solid(font, shape_names[c2].c_str(), textColor));
shape_label_gl = gl_texture(shape_label);
draw_rect(shapes[c2][0], shapes[c2][1], shape_label->w, shape_label->h, shape_label_gl, 0);
SDL_FreeSurface(shape_label);

但是，当我使用 valgrind 时，它提示有很多相对较大的内存泄漏。当我在 Activity Monitor (Mac) 中监控该程序时，它可能会攀升至近 500 mb 的内存使用量，并且可能会从那里继续。

这是 valgrind 错误:

==61330== 1,193,304 (13,816 direct, 1,179,488 indirect) bytes in 157 blocks are definitely lost in loss record 6,944 of 6,944
==61330==    at 0xB823: malloc (vg_replace_malloc.c:266)
==61330==    by 0x4D667: SDL_CreateRGBSurface (in /Library/Frameworks/SDL.framework/Versions/A/SDL)
==61330==    by 0xE84C3: TTF_RenderUNICODE_Solid (in /Library/Frameworks/SDL_ttf.framework/Versions/A/SDL_ttf)
==61330==    by 0xE836D: TTF_RenderText_Solid (in /Library/Frameworks/SDL_ttf.framework/Versions/A/SDL_ttf)
==61330==    by 0x10000A06D: SDL_main (in ./leveleditor)
==61330==    by 0x100013530: -[SDLMain applicationDidFinishLaunching:] (in ./leveleditor)
==61330==    by 0x65AD0D: __-[NSNotificationCenter addObserver:selector:name:object:]_block_invoke_1 (in /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation)
==61330==    by 0x36C7B9: _CFXNotificationPost (in /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation)
==61330==    by 0x646FC2: -[NSNotificationCenter postNotificationName:object:userInfo:] (in /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation)
==61330==    by 0xB4C4E2: -[NSApplication _postDidFinishNotification] (in /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
==61330==    by 0xB4C248: -[NSApplication _sendFinishLaunchingNotification] (in /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
==61330==    by 0xB4AF0F: -[NSApplication(NSAppleEventHandling) _handleAEOpenEvent:] (in /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)

关于如何在不使用大量内存的情况下使 TTF 逐帧工作有什么想法吗？

编辑:为了将来引用，我是个白痴。我忘了这样做:

glDeleteTextures(1, &status_bottom_gl);

Answer 1

TTF_RenderText_Solid 分配一个您没有释放的新表面:

SDL_Surface *ttf = TTF_RenderText_Solid(font, shape_names[c2].c_str(), textColor);
shape_label = SDL_DisplayFormat(ttf);
shape_label_gl = gl_texture(shape_label);
draw_rect(shapes[c2][0], shapes[c2][1], shape_label->w, shape_label->h, shape_label_gl, 0);
SDL_FreeSurface(shape_label);
SDL_FreeSurface(ttf); // Must free this as well!

请注意，为了获得最佳性能，您应该将这些表面缓存在某个地方，而不是每帧都创建和销毁它们。