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SDL_ttf.c
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SDL_ttf.c
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/*
SDL_ttf: A companion library to SDL for working with TrueType (tm) fonts
Copyright (C) 2001-2012 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif
#ifdef HAVE_ALLOCA
#define ALLOCA(n) ((void*)alloca(n))
#define FREEA(p)
#else
#define ALLOCA(n) malloc(n)
#define FREEA(p) free(p)
#endif
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_OUTLINE_H
#include FT_STROKER_H
#include FT_GLYPH_H
#include FT_TRUETYPE_IDS_H
#include "SDL.h"
#include "SDL_endian.h"
#include "SDL_ttf.h"
/* FIXME: Right now we assume the gray-scale renderer Freetype is using
supports 256 shades of gray, but we should instead key off of num_grays
in the result FT_Bitmap after the FT_Render_Glyph() call. */
#define NUM_GRAYS 256
/* Handy routines for converting from fixed point */
#define FT_FLOOR(X) ((X & -64) / 64)
#define FT_CEIL(X) (((X + 63) & -64) / 64)
#define CACHED_METRICS 0x10
#define CACHED_BITMAP 0x01
#define CACHED_PIXMAP 0x02
/* Cached glyph information */
typedef struct cached_glyph {
int stored;
FT_UInt index;
FT_Bitmap bitmap;
FT_Bitmap pixmap;
int minx;
int maxx;
int miny;
int maxy;
int yoffset;
int advance;
Uint16 cached;
} c_glyph;
/* The structure used to hold internal font information */
struct _TTF_Font {
/* Freetype2 maintains all sorts of useful info itself */
FT_Face face;
/* We'll cache these ourselves */
int height;
int ascent;
int descent;
int lineskip;
/* The font style */
int face_style;
int style;
int outline;
/* Whether kerning is desired */
int kerning;
/* Extra width in glyph bounds for text styles */
int glyph_overhang;
float glyph_italics;
/* Information in the font for underlining */
int underline_offset;
int underline_height;
/* Cache for style-transformed glyphs */
c_glyph *current;
c_glyph cache[257]; /* 257 is a prime */
/* We are responsible for closing the font stream */
SDL_RWops *src;
int freesrc;
FT_Open_Args args;
/* For non-scalable formats, we must remember which font index size */
int font_size_family;
/* really just flags passed into FT_Load_Glyph */
int hinting;
};
/* Handle a style only if the font does not already handle it */
#define TTF_HANDLE_STYLE_BOLD(font) (((font)->style & TTF_STYLE_BOLD) && \
!((font)->face_style & TTF_STYLE_BOLD))
#define TTF_HANDLE_STYLE_ITALIC(font) (((font)->style & TTF_STYLE_ITALIC) && \
!((font)->face_style & TTF_STYLE_ITALIC))
#define TTF_HANDLE_STYLE_UNDERLINE(font) ((font)->style & TTF_STYLE_UNDERLINE)
#define TTF_HANDLE_STYLE_STRIKETHROUGH(font) ((font)->style & TTF_STYLE_STRIKETHROUGH)
/* Font styles that does not impact glyph drawing */
#define TTF_STYLE_NO_GLYPH_CHANGE (TTF_STYLE_UNDERLINE | TTF_STYLE_STRIKETHROUGH)
/* The FreeType font engine/library */
static FT_Library library;
static int TTF_initialized = 0;
static int TTF_byteswapped = 0;
/* Gets the top row of the underline. The outline
is taken into account.
*/
static __inline__ int TTF_underline_top_row(TTF_Font *font)
{
/* With outline, the underline_offset is underline_offset+outline. */
/* So, we don't have to remove the top part of the outline height. */
return font->ascent - font->underline_offset - 1;
}
/* Gets the top row of the underline. for a given glyph. The outline
is taken into account.
Need to update row according to height difference between font and glyph:
font_value - font->ascent + glyph->maxy
*/
static __inline__ int TTF_Glyph_underline_top_row(TTF_Font *font, c_glyph *glyph)
{
return glyph->maxy - font->underline_offset - 1;
}
/* Gets the bottom row of the underline. The outline
is taken into account.
*/
static __inline__ int TTF_underline_bottom_row(TTF_Font *font)
{
int row = TTF_underline_top_row(font) + font->underline_height;
if( font->outline > 0 ) {
/* Add underline_offset outline offset and */
/* the bottom part of the outline. */
row += font->outline * 2;
}
return row;
}
/* Gets the bottom row of the underline. for a given glyph. The outline
is taken into account.
Need to update row according to height difference between font and glyph:
font_value - font->ascent + glyph->maxy
*/
static __inline__ int TTF_Glyph_underline_bottom_row(TTF_Font *font, c_glyph *glyph)
{
return TTF_underline_bottom_row(font) - font->ascent + glyph->maxy;
}
/* Gets the top row of the strikethrough. The outline
is taken into account.
*/
static __inline__ int TTF_strikethrough_top_row(TTF_Font *font)
{
/* With outline, the first text row is 'outline'. */
/* So, we don't have to remove the top part of the outline height. */
return font->height / 2;
}
/* Gets the top row of the strikethrough for a given glyph. The outline
is taken into account.
Need to update row according to height difference between font and glyph:
font_value - font->ascent + glyph->maxy
*/
static __inline__ int TTF_Glyph_strikethrough_top_row(TTF_Font *font, c_glyph *glyph)
{
return TTF_strikethrough_top_row(font) - font->ascent + glyph->maxy;
}
static void TTF_initLineMectrics(const TTF_Font *font, const SDL_Surface *textbuf, const int row, Uint8 **pdst, int *pheight)
{
Uint8 *dst;
int height;
dst = (Uint8 *)textbuf->pixels;
if( row > 0 ) {
dst += row * textbuf->pitch;
}
height = font->underline_height;
/* Take outline into account */
if( font->outline > 0 ) {
height += font->outline * 2;
}
*pdst = dst;
*pheight = height;
}
/* Draw a solid line of underline_height (+ optional outline)
at the given row. The row value must take the
outline into account.
*/
static void TTF_drawLine_Solid(const TTF_Font *font, const SDL_Surface *textbuf, const int row)
{
int line;
Uint8 *dst_check = (Uint8*)textbuf->pixels + textbuf->pitch * textbuf->h;
Uint8 *dst;
int height;
TTF_initLineMectrics(font, textbuf, row, &dst, &height);
/* Draw line */
for ( line=height; line>0 && dst < dst_check; --line ) {
/* 1 because 0 is the bg color */
memset( dst, 1, textbuf->w );
dst += textbuf->pitch;
}
}
/* Draw a shaded line of underline_height (+ optional outline)
at the given row. The row value must take the
outline into account.
*/
static void TTF_drawLine_Shaded(const TTF_Font *font, const SDL_Surface *textbuf, const int row)
{
int line;
Uint8 *dst_check = (Uint8*)textbuf->pixels + textbuf->pitch * textbuf->h;
Uint8 *dst;
int height;
TTF_initLineMectrics(font, textbuf, row, &dst, &height);
/* Draw line */
for ( line=height; line>0 && dst < dst_check; --line ) {
memset( dst, NUM_GRAYS - 1, textbuf->w );
dst += textbuf->pitch;
}
}
/* Draw a blended line of underline_height (+ optional outline)
at the given row. The row value must take the
outline into account.
*/
static void TTF_drawLine_Blended(const TTF_Font *font, const SDL_Surface *textbuf, const int row, const Uint32 color)
{
int line;
Uint32 *dst_check = (Uint32*)textbuf->pixels + textbuf->pitch/4 * textbuf->h;
Uint8 *dst8; /* destination, byte version */
Uint32 *dst;
int height;
int col;
Uint32 pixel = color | 0xFF000000; /* Amask */
TTF_initLineMectrics(font, textbuf, row, &dst8, &height);
dst = (Uint32 *) dst8;
/* Draw line */
for ( line=height; line>0 && dst < dst_check; --line ) {
for ( col=0; col < textbuf->w; ++col ) {
dst[col] = pixel;
}
dst += textbuf->pitch/4;
}
}
/* rcg06192001 get linked library's version. */
const SDL_version *TTF_Linked_Version(void)
{
static SDL_version linked_version;
SDL_TTF_VERSION(&linked_version);
return(&linked_version);
}
/* This function tells the library whether UNICODE text is generally
byteswapped. A UNICODE BOM character at the beginning of a string
will override this setting for that string.
*/
void TTF_ByteSwappedUNICODE(int swapped)
{
TTF_byteswapped = swapped;
}
static void TTF_SetFTError(const char *msg, FT_Error error)
{
#ifdef USE_FREETYPE_ERRORS
#undef FTERRORS_H
#define FT_ERRORDEF( e, v, s ) { e, s },
static const struct
{
int err_code;
const char* err_msg;
} ft_errors[] = {
#include <freetype/fterrors.h>
};
int i;
const char *err_msg;
char buffer[1024];
err_msg = NULL;
for ( i=0; i<((sizeof ft_errors)/(sizeof ft_errors[0])); ++i ) {
if ( error == ft_errors[i].err_code ) {
err_msg = ft_errors[i].err_msg;
break;
}
}
if ( ! err_msg ) {
err_msg = "unknown FreeType error";
}
sprintf(buffer, "%s: %s", msg, err_msg);
TTF_SetError(buffer);
#else
TTF_SetError(msg);
#endif /* USE_FREETYPE_ERRORS */
}
int TTF_Init( void )
{
int status = 0;
if ( ! TTF_initialized ) {
FT_Error error = FT_Init_FreeType( &library );
if ( error ) {
TTF_SetFTError("Couldn't init FreeType engine", error);
status = -1;
}
}
if ( status == 0 ) {
++TTF_initialized;
}
return status;
}
static unsigned long RWread(
FT_Stream stream,
unsigned long offset,
unsigned char* buffer,
unsigned long count
)
{
SDL_RWops *src;
src = (SDL_RWops *)stream->descriptor.pointer;
SDL_RWseek( src, (int)offset, RW_SEEK_SET );
if ( count == 0 ) {
return 0;
}
return SDL_RWread( src, buffer, 1, (int)count );
}
TTF_Font* TTF_OpenFontIndexRW( SDL_RWops *src, int freesrc, int ptsize, long index )
{
TTF_Font* font;
FT_Error error;
FT_Face face;
FT_Fixed scale;
FT_Stream stream;
FT_CharMap found;
int position, i;
if ( ! TTF_initialized ) {
TTF_SetError( "Library not initialized" );
return NULL;
}
/* Check to make sure we can seek in this stream */
position = SDL_RWtell(src);
if ( position < 0 ) {
TTF_SetError( "Can't seek in stream" );
return NULL;
}
font = (TTF_Font*) malloc(sizeof *font);
if ( font == NULL ) {
TTF_SetError( "Out of memory" );
return NULL;
}
memset(font, 0, sizeof(*font));
font->src = src;
font->freesrc = freesrc;
stream = (FT_Stream)malloc(sizeof(*stream));
if ( stream == NULL ) {
TTF_SetError( "Out of memory" );
TTF_CloseFont( font );
return NULL;
}
memset(stream, 0, sizeof(*stream));
stream->read = RWread;
stream->descriptor.pointer = src;
stream->pos = (unsigned long)position;
SDL_RWseek(src, 0, RW_SEEK_END);
stream->size = (unsigned long)(SDL_RWtell(src) - position);
SDL_RWseek(src, position, RW_SEEK_SET);
font->args.flags = FT_OPEN_STREAM;
font->args.stream = stream;
error = FT_Open_Face( library, &font->args, index, &font->face );
if( error ) {
TTF_SetFTError( "Couldn't load font file", error );
TTF_CloseFont( font );
return NULL;
}
face = font->face;
/* Set charmap for loaded font */
found = 0;
for (i = 0; i < face->num_charmaps; i++) {
FT_CharMap charmap = face->charmaps[i];
if ((charmap->platform_id == 3 && charmap->encoding_id == 1) /* Windows Unicode */
|| (charmap->platform_id == 3 && charmap->encoding_id == 0) /* Windows Symbol */
|| (charmap->platform_id == 2 && charmap->encoding_id == 1) /* ISO Unicode */
|| (charmap->platform_id == 0)) { /* Apple Unicode */
found = charmap;
break;
}
}
if ( found ) {
/* If this fails, continue using the default charmap */
FT_Set_Charmap(face, found);
}
/* Make sure that our font face is scalable (global metrics) */
if ( FT_IS_SCALABLE(face) ) {
/* Set the character size and use default DPI (72) */
error = FT_Set_Char_Size( font->face, 0, ptsize * 64, 0, 0 );
if( error ) {
TTF_SetFTError( "Couldn't set font size", error );
TTF_CloseFont( font );
return NULL;
}
/* Get the scalable font metrics for this font */
scale = face->size->metrics.y_scale;
font->ascent = FT_CEIL(FT_MulFix(face->ascender, scale));
font->descent = FT_CEIL(FT_MulFix(face->descender, scale));
font->height = font->ascent - font->descent + /* baseline */ 1;
font->lineskip = FT_CEIL(FT_MulFix(face->height, scale));
font->underline_offset = FT_FLOOR(FT_MulFix(face->underline_position, scale));
font->underline_height = FT_FLOOR(FT_MulFix(face->underline_thickness, scale));
} else {
/* Non-scalable font case. ptsize determines which family
* or series of fonts to grab from the non-scalable format.
* It is not the point size of the font.
* */
if ( ptsize >= font->face->num_fixed_sizes )
ptsize = font->face->num_fixed_sizes - 1;
font->font_size_family = ptsize;
error = FT_Set_Pixel_Sizes( face,
face->available_sizes[ptsize].height,
face->available_sizes[ptsize].width );
/* With non-scalale fonts, Freetype2 likes to fill many of the
* font metrics with the value of 0. The size of the
* non-scalable fonts must be determined differently
* or sometimes cannot be determined.
* */
font->ascent = face->available_sizes[ptsize].height;
font->descent = 0;
font->height = face->available_sizes[ptsize].height;
font->lineskip = FT_CEIL(font->ascent);
font->underline_offset = FT_FLOOR(face->underline_position);
font->underline_height = FT_FLOOR(face->underline_thickness);
}
if ( font->underline_height < 1 ) {
font->underline_height = 1;
}
#ifdef DEBUG_FONTS
printf("Font metrics:\n");
printf("\tascent = %d, descent = %d\n",
font->ascent, font->descent);
printf("\theight = %d, lineskip = %d\n",
font->height, font->lineskip);
printf("\tunderline_offset = %d, underline_height = %d\n",
font->underline_offset, font->underline_height);
printf("\tunderline_top_row = %d, strikethrough_top_row = %d\n",
TTF_underline_top_row(font), TTF_strikethrough_top_row(font));
#endif
/* Initialize the font face style */
font->face_style = TTF_STYLE_NORMAL;
if ( font->face->style_flags & FT_STYLE_FLAG_BOLD ) {
font->face_style |= TTF_STYLE_BOLD;
}
if ( font->face->style_flags & FT_STYLE_FLAG_ITALIC ) {
font->face_style |= TTF_STYLE_ITALIC;
}
/* Set the default font style */
font->style = font->face_style;
font->outline = 0;
font->kerning = 1;
font->glyph_overhang = face->size->metrics.y_ppem / 10;
/* x offset = cos(((90.0-12)/360)*2*M_PI), or 12 degree angle */
font->glyph_italics = 0.207f;
font->glyph_italics *= font->height;
return font;
}
TTF_Font* TTF_OpenFontRW( SDL_RWops *src, int freesrc, int ptsize )
{
return TTF_OpenFontIndexRW(src, freesrc, ptsize, 0);
}
TTF_Font* TTF_OpenFontIndex( const char *file, int ptsize, long index )
{
SDL_RWops *rw = SDL_RWFromFile(file, "rb");
if ( rw == NULL ) {
TTF_SetError(SDL_GetError());
return NULL;
}
return TTF_OpenFontIndexRW(rw, 1, ptsize, index);
}
TTF_Font* TTF_OpenFont( const char *file, int ptsize )
{
return TTF_OpenFontIndex(file, ptsize, 0);
}
static void Flush_Glyph( c_glyph* glyph )
{
glyph->stored = 0;
glyph->index = 0;
if( glyph->bitmap.buffer ) {
free( glyph->bitmap.buffer );
glyph->bitmap.buffer = 0;
}
if( glyph->pixmap.buffer ) {
free( glyph->pixmap.buffer );
glyph->pixmap.buffer = 0;
}
glyph->cached = 0;
}
static void Flush_Cache( TTF_Font* font )
{
int i;
int size = sizeof( font->cache ) / sizeof( font->cache[0] );
for( i = 0; i < size; ++i ) {
if( font->cache[i].cached ) {
Flush_Glyph( &font->cache[i] );
}
}
}
static FT_Error Load_Glyph( TTF_Font* font, Uint16 ch, c_glyph* cached, int want )
{
FT_Face face;
FT_Error error;
FT_GlyphSlot glyph;
FT_Glyph_Metrics* metrics;
FT_Outline* outline;
if ( !font || !font->face ) {
return FT_Err_Invalid_Handle;
}
face = font->face;
/* Load the glyph */
if ( ! cached->index ) {
cached->index = FT_Get_Char_Index( face, ch );
}
error = FT_Load_Glyph( face, cached->index, FT_LOAD_DEFAULT | font->hinting);
if( error ) {
return error;
}
/* Get our glyph shortcuts */
glyph = face->glyph;
metrics = &glyph->metrics;
outline = &glyph->outline;
/* Get the glyph metrics if desired */
if ( (want & CACHED_METRICS) && !(cached->stored & CACHED_METRICS) ) {
if ( FT_IS_SCALABLE( face ) ) {
/* Get the bounding box */
cached->minx = FT_FLOOR(metrics->horiBearingX);
cached->maxx = cached->minx + FT_CEIL(metrics->width);
cached->maxy = FT_FLOOR(metrics->horiBearingY);
cached->miny = cached->maxy - FT_CEIL(metrics->height);
cached->yoffset = font->ascent - cached->maxy;
cached->advance = FT_CEIL(metrics->horiAdvance);
} else {
/* Get the bounding box for non-scalable format.
* Again, freetype2 fills in many of the font metrics
* with the value of 0, so some of the values we
* need must be calculated differently with certain
* assumptions about non-scalable formats.
* */
cached->minx = FT_FLOOR(metrics->horiBearingX);
cached->maxx = cached->minx + FT_CEIL(metrics->horiAdvance);
cached->maxy = FT_FLOOR(metrics->horiBearingY);
cached->miny = cached->maxy - FT_CEIL(face->available_sizes[font->font_size_family].height);
cached->yoffset = 0;
cached->advance = FT_CEIL(metrics->horiAdvance);
}
/* Adjust for bold and italic text */
if( TTF_HANDLE_STYLE_BOLD(font) ) {
cached->maxx += font->glyph_overhang;
}
if( TTF_HANDLE_STYLE_ITALIC(font) ) {
cached->maxx += (int)ceil(font->glyph_italics);
}
cached->stored |= CACHED_METRICS;
}
if ( ((want & CACHED_BITMAP) && !(cached->stored & CACHED_BITMAP)) ||
((want & CACHED_PIXMAP) && !(cached->stored & CACHED_PIXMAP)) ) {
int mono = (want & CACHED_BITMAP);
int i;
FT_Bitmap* src;
FT_Bitmap* dst;
FT_Glyph bitmap_glyph = NULL;
/* Handle the italic style */
if( TTF_HANDLE_STYLE_ITALIC(font) ) {
FT_Matrix shear;
shear.xx = 1 << 16;
shear.xy = (int) ( font->glyph_italics * ( 1 << 16 ) ) / font->height;
shear.yx = 0;
shear.yy = 1 << 16;
FT_Outline_Transform( outline, &shear );
}
/* Render as outline */
if( (font->outline > 0) && glyph->format != FT_GLYPH_FORMAT_BITMAP ) {
FT_Stroker stroker;
FT_Get_Glyph( glyph, &bitmap_glyph );
error = FT_Stroker_New( library, &stroker );
if( error ) {
return error;
}
FT_Stroker_Set( stroker, font->outline * 64, FT_STROKER_LINECAP_ROUND, FT_STROKER_LINEJOIN_ROUND, 0 );
FT_Glyph_Stroke( &bitmap_glyph, stroker, 1 /* delete the original glyph */ );
FT_Stroker_Done( stroker );
/* Render the glyph */
error = FT_Glyph_To_Bitmap( &bitmap_glyph, mono ? ft_render_mode_mono : ft_render_mode_normal, 0, 1 );
if( error ) {
FT_Done_Glyph( bitmap_glyph );
return error;
}
src = &((FT_BitmapGlyph)bitmap_glyph)->bitmap;
} else {
/* Render the glyph */
error = FT_Render_Glyph( glyph, mono ? ft_render_mode_mono : ft_render_mode_normal );
if( error ) {
return error;
}
src = &glyph->bitmap;
}
/* Copy over information to cache */
if ( mono ) {
dst = &cached->bitmap;
} else {
dst = &cached->pixmap;
}
memcpy( dst, src, sizeof( *dst ) );
/* FT_Render_Glyph() and .fon fonts always generate a
* two-color (black and white) glyphslot surface, even
* when rendered in ft_render_mode_normal. */
/* FT_IS_SCALABLE() means that the font is in outline format,
* but does not imply that outline is rendered as 8-bit
* grayscale, because embedded bitmap/graymap is preferred
* (see FT_LOAD_DEFAULT section of FreeType2 API Reference).
* FT_Render_Glyph() canreturn two-color bitmap or 4/16/256-
* color graymap according to the format of embedded bitmap/
* graymap. */
if ( src->pixel_mode == FT_PIXEL_MODE_MONO ) {
dst->pitch *= 8;
} else if ( src->pixel_mode == FT_PIXEL_MODE_GRAY2 ) {
dst->pitch *= 4;
} else if ( src->pixel_mode == FT_PIXEL_MODE_GRAY4 ) {
dst->pitch *= 2;
}
/* Adjust for bold and italic text */
if( TTF_HANDLE_STYLE_BOLD(font) ) {
int bump = font->glyph_overhang;
dst->pitch += bump;
dst->width += bump;
}
if( TTF_HANDLE_STYLE_ITALIC(font) ) {
int bump = (int)ceil(font->glyph_italics);
dst->pitch += bump;
dst->width += bump;
}
if (dst->rows != 0) {
dst->buffer = (unsigned char *)malloc( dst->pitch * dst->rows );
if( !dst->buffer ) {
return FT_Err_Out_Of_Memory;
}
memset( dst->buffer, 0, dst->pitch * dst->rows );
for( i = 0; i < src->rows; i++ ) {
int soffset = i * src->pitch;
int doffset = i * dst->pitch;
if ( mono ) {
unsigned char *srcp = src->buffer + soffset;
unsigned char *dstp = dst->buffer + doffset;
int j;
if ( src->pixel_mode == FT_PIXEL_MODE_MONO ) {
for ( j = 0; j < src->width; j += 8 ) {
unsigned char c = *srcp++;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
}
} else if ( src->pixel_mode == FT_PIXEL_MODE_GRAY2 ) {
for ( j = 0; j < src->width; j += 4 ) {
unsigned char c = *srcp++;
*dstp++ = (((c&0xA0) >> 6) >= 0x2) ? 1 : 0;
c <<= 2;
*dstp++ = (((c&0xA0) >> 6) >= 0x2) ? 1 : 0;
c <<= 2;
*dstp++ = (((c&0xA0) >> 6) >= 0x2) ? 1 : 0;
c <<= 2;
*dstp++ = (((c&0xA0) >> 6) >= 0x2) ? 1 : 0;
}
} else if ( src->pixel_mode == FT_PIXEL_MODE_GRAY4 ) {
for ( j = 0; j < src->width; j += 2 ) {
unsigned char c = *srcp++;
*dstp++ = (((c&0xF0) >> 4) >= 0x8) ? 1 : 0;
c <<= 4;
*dstp++ = (((c&0xF0) >> 4) >= 0x8) ? 1 : 0;
}
} else {
for ( j = 0; j < src->width; j++ ) {
unsigned char c = *srcp++;
*dstp++ = (c >= 0x80) ? 1 : 0;
}
}
} else if ( src->pixel_mode == FT_PIXEL_MODE_MONO ) {
/* This special case wouldn't
* be here if the FT_Render_Glyph()
* function wasn't buggy when it tried
* to render a .fon font with 256
* shades of gray. Instead, it
* returns a black and white surface
* and we have to translate it back
* to a 256 gray shaded surface.
* */
unsigned char *srcp = src->buffer + soffset;
unsigned char *dstp = dst->buffer + doffset;
unsigned char c;
int j, k;
for ( j = 0; j < src->width; j += 8) {
c = *srcp++;
for (k = 0; k < 8; ++k) {
if ((c&0x80) >> 7) {
*dstp++ = NUM_GRAYS - 1;
} else {
*dstp++ = 0x00;
}
c <<= 1;
}
}
} else if ( src->pixel_mode == FT_PIXEL_MODE_GRAY2 ) {
unsigned char *srcp = src->buffer + soffset;
unsigned char *dstp = dst->buffer + doffset;
unsigned char c;
int j, k;
for ( j = 0; j < src->width; j += 4 ) {
c = *srcp++;
for ( k = 0; k < 4; ++k ) {
if ((c&0xA0) >> 6) {
*dstp++ = NUM_GRAYS * ((c&0xA0) >> 6) / 3 - 1;
} else {
*dstp++ = 0x00;
}
c <<= 2;
}
}
} else if ( src->pixel_mode == FT_PIXEL_MODE_GRAY4 ) {
unsigned char *srcp = src->buffer + soffset;
unsigned char *dstp = dst->buffer + doffset;
unsigned char c;
int j, k;
for ( j = 0; j < src->width; j += 2 ) {
c = *srcp++;
for ( k = 0; k < 2; ++k ) {
if ((c&0xF0) >> 4) {
*dstp++ = NUM_GRAYS * ((c&0xF0) >> 4) / 15 - 1;
} else {
*dstp++ = 0x00;
}
c <<= 4;
}
}
} else {
memcpy(dst->buffer+doffset,
src->buffer+soffset, src->pitch);
}
}
}
/* Handle the bold style */
if ( TTF_HANDLE_STYLE_BOLD(font) ) {
int row;
int col;
int offset;
int pixel;
Uint8* pixmap;
/* The pixmap is a little hard, we have to add and clamp */
for( row = dst->rows - 1; row >= 0; --row ) {
pixmap = (Uint8*) dst->buffer + row * dst->pitch;
for( offset=1; offset <= font->glyph_overhang; ++offset ) {
for( col = dst->width - 1; col > 0; --col ) {
if( mono ) {
pixmap[col] |= pixmap[col-1];
} else {
pixel = (pixmap[col] + pixmap[col-1]);
if( pixel > NUM_GRAYS - 1 ) {
pixel = NUM_GRAYS - 1;
}
pixmap[col] = (Uint8) pixel;
}
}
}
}
}
/* Mark that we rendered this format */
if ( mono ) {
cached->stored |= CACHED_BITMAP;
} else {
cached->stored |= CACHED_PIXMAP;
}
/* Free outlined glyph */
if( bitmap_glyph ) {
FT_Done_Glyph( bitmap_glyph );
}
}
/* We're done, mark this glyph cached */
cached->cached = ch;
return 0;
}
static FT_Error Find_Glyph( TTF_Font* font, Uint16 ch, int want )
{
int retval = 0;
int hsize = sizeof( font->cache ) / sizeof( font->cache[0] );
int h = ch % hsize;
font->current = &font->cache[h];
if (font->current->cached != ch)
Flush_Glyph( font->current );
if ( (font->current->stored & want) != want ) {
retval = Load_Glyph( font, ch, font->current, want );
}
return retval;
}
void TTF_CloseFont( TTF_Font* font )
{
if ( font ) {
Flush_Cache( font );
if ( font->face ) {
FT_Done_Face( font->face );
}
if ( font->args.stream ) {
free( font->args.stream );
}
if ( font->freesrc ) {
SDL_RWclose( font->src );
}
free( font );
}
}
static Uint16 *LATIN1_to_UNICODE(Uint16 *unicode, const char *text, int len)
{
int i;
for ( i=0; i < len; ++i ) {
unicode[i] = ((const unsigned char *)text)[i];
}
unicode[i] = 0;
return unicode;
}
static Uint16 *UTF8_to_UNICODE(Uint16 *unicode, const char *utf8, int len)
{
int i, j;
Uint16 ch;
for ( i=0, j=0; i < len; ++i, ++j ) {
ch = ((const unsigned char *)utf8)[i];
if ( ch >= 0xF0 ) {
ch = (Uint16)(utf8[i]&0x07) << 18;
ch |= (Uint16)(utf8[++i]&0x3F) << 12;
ch |= (Uint16)(utf8[++i]&0x3F) << 6;
ch |= (Uint16)(utf8[++i]&0x3F);
} else
if ( ch >= 0xE0 ) {
ch = (Uint16)(utf8[i]&0x0F) << 12;
ch |= (Uint16)(utf8[++i]&0x3F) << 6;
ch |= (Uint16)(utf8[++i]&0x3F);
} else
if ( ch >= 0xC0 ) {
ch = (Uint16)(utf8[i]&0x1F) << 6;
ch |= (Uint16)(utf8[++i]&0x3F);
}
unicode[j] = ch;
}
unicode[j] = 0;
return unicode;
}
int TTF_FontHeight(const TTF_Font *font)
{
return(font->height);
}
int TTF_FontAscent(const TTF_Font *font)
{
return(font->ascent);
}
int TTF_FontDescent(const TTF_Font *font)
{
return(font->descent);
}
int TTF_FontLineSkip(const TTF_Font *font)
{
return(font->lineskip);
}
int TTF_GetFontKerning(const TTF_Font *font)
{
return(font->kerning);
}
void TTF_SetFontKerning(TTF_Font *font, int allowed)
{
font->kerning = allowed;
}
long TTF_FontFaces(const TTF_Font *font)
{
return(font->face->num_faces);
}
int TTF_FontFaceIsFixedWidth(const TTF_Font *font)
{