Francesco Abbate
46c3bdea67
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.
132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
#include "api.h"
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#include "renderer.h"
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#include "rencache.h"
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static RenColor checkcolor(lua_State *L, int idx, int def) {
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RenColor color;
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if (lua_isnoneornil(L, idx)) {
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return (RenColor) { def, def, def, 255 };
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}
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lua_rawgeti(L, idx, 1);
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lua_rawgeti(L, idx, 2);
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lua_rawgeti(L, idx, 3);
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lua_rawgeti(L, idx, 4);
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color.r = luaL_checknumber(L, -4);
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color.g = luaL_checknumber(L, -3);
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color.b = luaL_checknumber(L, -2);
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color.a = luaL_optnumber(L, -1, 255);
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lua_pop(L, 4);
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return color;
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}
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static int f_show_debug(lua_State *L) {
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luaL_checkany(L, 1);
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rencache_show_debug(lua_toboolean(L, 1));
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return 0;
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}
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static int f_get_size(lua_State *L) {
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int w, h;
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ren_get_size(&w, &h);
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lua_pushnumber(L, w);
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lua_pushnumber(L, h);
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return 2;
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}
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static int f_begin_frame(lua_State *L) {
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rencache_begin_frame();
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return 0;
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}
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static int f_end_frame(lua_State *L) {
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rencache_end_frame();
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return 0;
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}
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static int f_set_clip_rect(lua_State *L) {
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RenRect rect;
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rect.x = luaL_checknumber(L, 1);
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rect.y = luaL_checknumber(L, 2);
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rect.width = luaL_checknumber(L, 3);
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rect.height = luaL_checknumber(L, 4);
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rencache_set_clip_rect(rect);
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return 0;
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}
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static int f_draw_rect(lua_State *L) {
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RenRect rect;
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rect.x = luaL_checknumber(L, 1);
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rect.y = luaL_checknumber(L, 2);
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rect.width = luaL_checknumber(L, 3);
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rect.height = luaL_checknumber(L, 4);
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RenColor color = checkcolor(L, 5, 255);
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rencache_draw_rect(rect, color);
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return 0;
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}
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static int draw_text_subpixel_impl(lua_State *L, bool draw_subpixel) {
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FontDesc *font_desc = luaL_checkudata(L, 1, API_TYPE_FONT);
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const char *text = luaL_checkstring(L, 2);
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/* The coordinate below will be in subpixel iff draw_subpixel is true.
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Otherwise it will be in pixels. */
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int x_subpixel = luaL_checknumber(L, 3);
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int y = luaL_checknumber(L, 4);
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RenColor color = checkcolor(L, 5, 255);
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CPReplaceTable *rep_table;
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RenColor replace_color;
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if (lua_gettop(L) >= 7) {
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rep_table = luaL_checkudata(L, 6, API_TYPE_REPLACE);
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replace_color = checkcolor(L, 7, 255);
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} else {
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rep_table = NULL;
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replace_color = (RenColor) {0};
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}
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x_subpixel = rencache_draw_text(font_desc, text, x_subpixel, y, color, draw_subpixel, rep_table, replace_color);
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lua_pushnumber(L, x_subpixel);
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return 1;
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}
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static int f_draw_text(lua_State *L) {
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return draw_text_subpixel_impl(L, false);
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}
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static int f_draw_text_subpixel(lua_State *L) {
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return draw_text_subpixel_impl(L, true);
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}
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static const luaL_Reg lib[] = {
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{ "show_debug", f_show_debug },
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{ "get_size", f_get_size },
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{ "begin_frame", f_begin_frame },
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{ "end_frame", f_end_frame },
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{ "set_clip_rect", f_set_clip_rect },
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{ "draw_rect", f_draw_rect },
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{ "draw_text", f_draw_text },
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{ "draw_text_subpixel", f_draw_text_subpixel },
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{ NULL, NULL }
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};
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int luaopen_renderer_font(lua_State *L);
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int luaopen_renderer_replacements(lua_State *L);
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int luaopen_renderer(lua_State *L) {
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luaL_newlib(L, lib);
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luaopen_renderer_font(L);
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lua_setfield(L, -2, "font");
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luaopen_renderer_replacements(L);
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lua_setfield(L, -2, "replacements");
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return 1;
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}
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