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lite-xl/src/rencache.h

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Initial commit
2019-12-28 12:16:32 +01:00
#ifndef RENCACHE_H
#define RENCACHE_H
#include <stdbool.h>
Fix crash problem with rencache and font access In some cases rencache was using a FontDesc pointer that was actually freed by Lua giving segfaults errors. In addition, some FontDesc object were not freed in some cases if the rencache_end_frame was not called when performing the "restart" command. The invalid access problem can happen because rencache keep some pointers to FontDesc object but these are Lua userdata that Lua can dispose of. This situation is prone to hard errors and we should avoid to keep pointers to objects managed by Lua. To this purpose we use luaL_ref/unref to bind the FontDesc into the Lua's registry while rencache need them. We still keeps pointer to FontDesc object but using luaL_ref we are assured they will not be disposed by Lua. Since we are using luaL_ref/unref to inform the GC about when the objects are in use we can now finalize the objects directly when Lua collects them. Previously the GC metamethods was issuing a FREE command to rencache and the font was actually freed only from the rencache_end_frame function.
2021-05-21 23:22:46 +02:00
#include <lua.h>
Initial commit
2019-12-28 12:16:32 +01:00
#include "renderer.h"
void rencache_show_debug(bool enable);
void rencache_set_clip_rect(RenRect rect);
void rencache_draw_rect(RenRect rect, RenColor color);
Fix crash problem with rencache and font access In some cases rencache was using a FontDesc pointer that was actually freed by Lua giving segfaults errors. In addition, some FontDesc object were not freed in some cases if the rencache_end_frame was not called when performing the "restart" command. The invalid access problem can happen because rencache keep some pointers to FontDesc object but these are Lua userdata that Lua can dispose of. This situation is prone to hard errors and we should avoid to keep pointers to objects managed by Lua. To this purpose we use luaL_ref/unref to bind the FontDesc into the Lua's registry while rencache need them. We still keeps pointer to FontDesc object but using luaL_ref we are assured they will not be disposed by Lua. Since we are using luaL_ref/unref to inform the GC about when the objects are in use we can now finalize the objects directly when Lua collects them. Previously the GC metamethods was issuing a FREE command to rencache and the font was actually freed only from the rencache_end_frame function.
2021-05-21 23:22:46 +02:00
int rencache_draw_text(lua_State *L, FontDesc *font_desc, int font_index, const char *text, int x, int y, RenColor color,
First implementation of scaling for retina display Introduce a new approach that discriminate coordinates in points and pixels. Now all the logic from the Lua side and in rencache is to always use points. The coordinates are converted to pixels only within the renderer, in the file renderer.c. In this way the application logic does not need to care about the scaling of the retina displays. For non-retina display the scaling between points and pixels is equal to one so nothing will change. There is nevertheless a change that leak into the Lua side. The subpixel coordinates are in sub-pixel, not sub-points so they are scaled by the retina scaling factor. But no change in the code is required because the subpixel scaling factor take into account the retina scaling, when present. Because the retina scaling factor is not know when the application starts but only when a window is actually available we introduce a mechanism to render the font with a given scaling factor only from the renderer when they are needed. We use therefore FontDesc to describe the font information but without actually rasterizing the font at a given scale.
2021-04-24 10:21:34 +02:00
bool draw_subpixel, CPReplaceTable *replacements, RenColor replace_color);
Added rencache invalidation on window-exposed event Fixes #63
2020-05-22 10:00:48 +02:00
void rencache_invalidate(void);
Fix crash problem with rencache and font access In some cases rencache was using a FontDesc pointer that was actually freed by Lua giving segfaults errors. In addition, some FontDesc object were not freed in some cases if the rencache_end_frame was not called when performing the "restart" command. The invalid access problem can happen because rencache keep some pointers to FontDesc object but these are Lua userdata that Lua can dispose of. This situation is prone to hard errors and we should avoid to keep pointers to objects managed by Lua. To this purpose we use luaL_ref/unref to bind the FontDesc into the Lua's registry while rencache need them. We still keeps pointer to FontDesc object but using luaL_ref we are assured they will not be disposed by Lua. Since we are using luaL_ref/unref to inform the GC about when the objects are in use we can now finalize the objects directly when Lua collects them. Previously the GC metamethods was issuing a FREE command to rencache and the font was actually freed only from the rencache_end_frame function.
2021-05-21 23:22:46 +02:00
void rencache_begin_frame(lua_State *L);
void rencache_end_frame(lua_State *L);
Initial commit
2019-12-28 12:16:32 +01:00
#endif