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https://github.com/airstruck/luigi.git
synced 2026-02-22 03:46:52 -07:00
add dedicated backend (WIP)
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airstruck
@@ -0,0 +1,270 @@
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local REL = (...):gsub('[^.]*$', '')
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local ffi = require 'ffi'
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local sdl = require(REL .. 'sdl')
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local SDL2_ttf = ffi.load 'SDL2_ttf'
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local IntOut = ffi.typeof 'int[1]'
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ffi.cdef [[
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/* The internal structure containing font information */
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typedef struct _TTF_Font TTF_Font;
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/* Initialize the TTF engine - returns 0 if successful, -1 on error */
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int TTF_Init(void);
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/* Open a font file and create a font of the specified point size.
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* Some .fon fonts will have several sizes embedded in the file, so the
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* point size becomes the index of choosing which size. If the value
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* is too high, the last indexed size will be the default. */
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TTF_Font *TTF_OpenFont(const char *file, int ptsize);
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TTF_Font *TTF_OpenFontIndex(const char *file, int ptsize, long index);
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TTF_Font *TTF_OpenFontRW(SDL_RWops *src, int freesrc, int ptsize);
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TTF_Font *TTF_OpenFontIndexRW(SDL_RWops *src, int freesrc, int ptsize, long index);
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/* Set and retrieve the font style
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#define TTF_STYLE_NORMAL 0x00
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#define TTF_STYLE_BOLD 0x01
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#define TTF_STYLE_ITALIC 0x02
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#define TTF_STYLE_UNDERLINE 0x04
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#define TTF_STYLE_STRIKETHROUGH 0x08
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*/
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int TTF_GetFontStyle(const TTF_Font *font);
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void TTF_SetFontStyle(TTF_Font *font, int style);
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int TTF_GetFontOutline(const TTF_Font *font);
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void TTF_SetFontOutline(TTF_Font *font, int outline);
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/* Set and retrieve FreeType hinter settings
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#define TTF_HINTING_NORMAL 0
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#define TTF_HINTING_LIGHT 1
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#define TTF_HINTING_MONO 2
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#define TTF_HINTING_NONE 3
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*/
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int TTF_GetFontHinting(const TTF_Font *font);
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void TTF_SetFontHinting(TTF_Font *font, int hinting);
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/* Get the total height of the font - usually equal to point size */
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int TTF_FontHeight(const TTF_Font *font);
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/* Get the offset from the baseline to the top of the font
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This is a positive value, relative to the baseline.
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*/
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int TTF_FontAscent(const TTF_Font *font);
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/* Get the offset from the baseline to the bottom of the font
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This is a negative value, relative to the baseline.
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*/
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int TTF_FontDescent(const TTF_Font *font);
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/* Get the recommended spacing between lines of text for this font */
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int TTF_FontLineSkip(const TTF_Font *font);
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/* Get/Set whether or not kerning is allowed for this font */
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int TTF_GetFontKerning(const TTF_Font *font);
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void TTF_SetFontKerning(TTF_Font *font, int allowed);
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/* Get the number of faces of the font */
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long TTF_FontFaces(const TTF_Font *font);
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/* Get the font face attributes, if any */
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int TTF_FontFaceIsFixedWidth(const TTF_Font *font);
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char *TTF_FontFaceFamilyName(const TTF_Font *font);
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char *TTF_FontFaceStyleName(const TTF_Font *font);
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/* Check wether a glyph is provided by the font or not */
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int TTF_GlyphIsProvided(const TTF_Font *font, Uint16 ch);
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/* Get the metrics (dimensions) of a glyph
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To understand what these metrics mean, here is a useful link:
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http://freetype.sourceforge.net/freetype2/docs/tutorial/step2.html
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*/
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int TTF_GlyphMetrics(TTF_Font *font, Uint16 ch,
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int *minx, int *maxx,
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int *miny, int *maxy, int *advance);
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/* Get the dimensions of a rendered string of text */
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int TTF_SizeText(TTF_Font *font, const char *text, int *w, int *h);
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int TTF_SizeUTF8(TTF_Font *font, const char *text, int *w, int *h);
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int TTF_SizeUTF8_Wrapped(TTF_Font *font, const char *text, int wrapLength, int *w, int *h, int *lineCount);
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int TTF_SizeUNICODE(TTF_Font *font, const Uint16 *text, int *w, int *h);
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/* Create an 8-bit palettized surface and render the given text at
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fast quality with the given font and color. The 0 pixel is the
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colorkey, giving a transparent background, and the 1 pixel is set
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to the text color.
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This function returns the new surface, or NULL if there was an error.
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*/
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SDL_Surface *TTF_RenderText_Solid(TTF_Font *font,
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const char *text, SDL_Color fg);
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SDL_Surface *TTF_RenderUTF8_Solid(TTF_Font *font,
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const char *text, SDL_Color fg);
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SDL_Surface *TTF_RenderUNICODE_Solid(TTF_Font *font,
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const Uint16 *text, SDL_Color fg);
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/* Create an 8-bit palettized surface and render the given glyph at
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fast quality with the given font and color. The 0 pixel is the
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colorkey, giving a transparent background, and the 1 pixel is set
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to the text color. The glyph is rendered without any padding or
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centering in the X direction, and aligned normally in the Y direction.
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This function returns the new surface, or NULL if there was an error.
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*/
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SDL_Surface *TTF_RenderGlyph_Solid(TTF_Font *font,
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Uint16 ch, SDL_Color fg);
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/* Create an 8-bit palettized surface and render the given text at
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high quality with the given font and colors. The 0 pixel is background,
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while other pixels have varying degrees of the foreground color.
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This function returns the new surface, or NULL if there was an error.
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*/
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SDL_Surface *TTF_RenderText_Shaded(TTF_Font *font,
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const char *text, SDL_Color fg, SDL_Color bg);
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SDL_Surface *TTF_RenderUTF8_Shaded(TTF_Font *font,
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const char *text, SDL_Color fg, SDL_Color bg);
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SDL_Surface *TTF_RenderUNICODE_Shaded(TTF_Font *font,
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const Uint16 *text, SDL_Color fg, SDL_Color bg);
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/* Create an 8-bit palettized surface and render the given glyph at
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high quality with the given font and colors. The 0 pixel is background,
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while other pixels have varying degrees of the foreground color.
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The glyph is rendered without any padding or centering in the X
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direction, and aligned normally in the Y direction.
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This function returns the new surface, or NULL if there was an error.
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*/
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SDL_Surface *TTF_RenderGlyph_Shaded(TTF_Font *font,
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Uint16 ch, SDL_Color fg, SDL_Color bg);
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/* Create a 32-bit ARGB surface and render the given text at high quality,
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using alpha blending to dither the font with the given color.
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This function returns the new surface, or NULL if there was an error.
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*/
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SDL_Surface *TTF_RenderText_Blended(TTF_Font *font,
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const char *text, SDL_Color fg);
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SDL_Surface *TTF_RenderUTF8_Blended(TTF_Font *font,
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const char *text, SDL_Color fg);
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SDL_Surface *TTF_RenderUNICODE_Blended(TTF_Font *font,
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const Uint16 *text, SDL_Color fg);
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/* Create a 32-bit ARGB surface and render the given text at high quality,
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using alpha blending to dither the font with the given color.
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Text is wrapped to multiple lines on line endings and on word boundaries
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if it extends beyond wrapLength in pixels.
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This function returns the new surface, or NULL if there was an error.
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*/
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SDL_Surface *TTF_RenderText_Blended_Wrapped(TTF_Font *font,
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const char *text, SDL_Color fg, Uint32 wrapLength);
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SDL_Surface *TTF_RenderUTF8_Blended_Wrapped(TTF_Font *font,
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const char *text, SDL_Color fg, Uint32 wrapLength);
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SDL_Surface *TTF_RenderUNICODE_Blended_Wrapped(TTF_Font *font,
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const Uint16 *text, SDL_Color fg, Uint32 wrapLength);
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/* Create a 32-bit ARGB surface and render the given glyph at high quality,
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using alpha blending to dither the font with the given color.
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The glyph is rendered without any padding or centering in the X
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direction, and aligned normally in the Y direction.
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This function returns the new surface, or NULL if there was an error.
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*/
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SDL_Surface *TTF_RenderGlyph_Blended(TTF_Font *font,
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Uint16 ch, SDL_Color fg);
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/* Close an opened font file */
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void TTF_CloseFont(TTF_Font *font);
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/* De-initialize the TTF engine */
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void TTF_Quit(void);
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/* Check if the TTF engine is initialized */
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int TTF_WasInit(void);
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/* Get the kerning size of two glyphs */
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int TTF_GetFontKerningSize(TTF_Font *font, int prev_index, int index);
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]]
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if SDL2_ttf.TTF_Init() ~= 0 then
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error(ffi.string(sdl.getError()))
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end
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local Font = setmetatable({}, { __call = function (self, ...)
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local object = setmetatable({}, { __index = self })
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return object, self.constructor(object, ...)
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end })
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Font.SDL2_ttf = SDL2_ttf
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local fontCache = {}
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function Font:constructor (path, size, color)
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if not size then
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size = 12
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end
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if not color then
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color = { 0, 0, 0, 255 }
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end
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if not path then
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path = REL:gsub('%.', '/') .. 'resource/DejaVuSans.ttf'
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end
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local key = path .. '_' .. size
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if not fontCache[key] then
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local font = SDL2_ttf.TTF_OpenFont(path, size)
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if font == nil then
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io.stderr:write(ffi.string(sdl.getError()))
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sdl.quit()
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os.exit(1)
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end
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fontCache[key] = font
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end
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self.sdlFont = fontCache[key]
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self.color = color
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end
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function Font:setAlignment (align)
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self.align = align
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end
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function Font:setWidth (width)
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self.width = width
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end
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function Font:getLineHeight ()
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return SDL2_ttf.TTF_FontHeight(self.sdlFont)
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end
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function Font:getAscender ()
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return SDL2_ttf.TTF_FontAscent(self.sdlFont)
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end
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function Font:getDescender ()
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return SDL2_ttf.TTF_FontDescent(self.sdlFont)
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end
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function Font:getAdvance (text)
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local w, h = IntOut(), IntOut()
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SDL2_ttf.TTF_SizeUTF8(self.sdlFont, text, w, h)
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return w[0]
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end
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function Font:getWrappedHeight (text)
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--[[
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-- TTF_Font *font, const char *text, int wrapLength, int *w, int *h, int *lineCount
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local w, h, lineCount = IntOut(), IntOut(), IntOut()
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SDL2_ttf.TTF_SizeUTF8_Wrapped(self.sdlFont, text, self.width,
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w, h, lineCount)
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return self:getLineHeight() * lineCount
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--]]
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local w, h = IntOut(), IntOut()
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SDL2_ttf.TTF_SizeUTF8(self.sdlFont, text, w, h)
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return h[0]
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end
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return Font
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