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font.c
1378 lines (1056 loc) · 35.4 KB
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font.c
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#include "imager.h"
#include "imrender.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_LIBT1
#endif
/*
=head1 NAME
font.c - implements font handling functions for t1 and truetype fonts
=head1 SYNOPSIS
i_init_fonts();
#ifdef HAVE_LIBT1
fontnum = i_t1_new(path_to_pfb, path_to_afm);
i_t1_bbox(fontnum, points, "foo", 3, i_img_dim cords[BOUNDING_BOX_COUNT]);
rc = i_t1_destroy(fontnum);
#endif
#ifdef HAVE_LIBTT
handle = i_tt_new(path_to_ttf);
rc = i_tt_bbox(handle, points, "foo", 3, int cords[6], utf8);
i_tt_destroy(handle);
// and much more
=head1 DESCRIPTION
font.c implements font creation, rendering, bounding box functions and
more for Imager.
=head1 FUNCTION REFERENCE
Some of these functions are internal.
=over
=cut
*/
/* Truetype font support */
#ifdef HAVE_LIBTT
/* These are enabled by default when configuring Freetype 1.x
I haven't a clue how to reliably detect it at compile time.
We need a compilation probe in Makefile.PL
*/
#define FTXPOST 1
#define FTXERR18 1
#include <freetype.h>
#define TT_CHC 5
#ifdef FTXPOST
#include <ftxpost.h>
#endif
#ifdef FTXERR18
#include <ftxerr18.h>
#endif
/* some versions of FT1.x don't seem to define this - it's font defined
so it won't change */
#ifndef TT_MS_LANGID_ENGLISH_GENERAL
#define TT_MS_LANGID_ENGLISH_GENERAL 0x0409
#endif
/* convert a code point into an index in the glyph cache */
#define TT_HASH(x) ((x) & 0xFF)
typedef struct i_glyph_entry_ {
TT_Glyph glyph;
unsigned long ch;
} i_tt_glyph_entry;
#define TT_NOCHAR (~0UL)
struct TT_Instancehandle_ {
TT_Instance instance;
TT_Instance_Metrics imetrics;
TT_Glyph_Metrics gmetrics[256];
i_tt_glyph_entry glyphs[256];
int smooth;
int order;
i_img_dim ptsize;
};
typedef struct TT_Instancehandle_ TT_Instancehandle;
struct TT_Fonthandle_ {
TT_Face face;
TT_Face_Properties properties;
TT_Instancehandle instanceh[TT_CHC];
TT_CharMap char_map;
#ifdef FTXPOST
int loaded_names;
TT_Error load_cond;
#endif
};
/* Defines */
#define USTRCT(x) ((x).z)
#define TT_VALID( handle ) ( ( handle ).z != NULL )
static void i_tt_push_error(TT_Error rc);
/* Prototypes */
static int i_tt_get_instance( TT_Fonthandle *handle, i_img_dim points, int smooth );
static void i_tt_init_raster_map( TT_Raster_Map* bit, i_img_dim width, i_img_dim height, int smooth );
static void i_tt_done_raster_map( TT_Raster_Map *bit );
static void i_tt_clear_raster_map( TT_Raster_Map* bit );
static void i_tt_blit_or( TT_Raster_Map *dst, TT_Raster_Map *src,i_img_dim x_off, i_img_dim y_off );
static int i_tt_get_glyph( TT_Fonthandle *handle, int inst, unsigned long j );
static void
i_tt_render_glyph( TT_Glyph glyph, TT_Glyph_Metrics* gmetrics,
TT_Raster_Map *bit, TT_Raster_Map *small_bit,
i_img_dim x_off, i_img_dim y_off, int smooth );
static int
i_tt_render_all_glyphs( TT_Fonthandle *handle, int inst, TT_Raster_Map *bit,
TT_Raster_Map *small_bit, i_img_dim cords[6],
char const* txt, size_t len, int smooth, int utf8 );
static void i_tt_dump_raster_map2( i_img* im, TT_Raster_Map* bit, i_img_dim xb, i_img_dim yb, const i_color *cl, int smooth );
static void i_tt_dump_raster_map_channel( i_img* im, TT_Raster_Map* bit, i_img_dim xb, i_img_dim yb, int channel, int smooth );
static int
i_tt_rasterize( TT_Fonthandle *handle, TT_Raster_Map *bit, i_img_dim cords[6],
double points, char const* txt, size_t len, int smooth, int utf8 );
static undef_int i_tt_bbox_inst( TT_Fonthandle *handle, int inst ,const char *txt, size_t len, i_img_dim cords[6], int utf8 );
/* static globals needed */
static int TT_initialized = 0;
static TT_Engine engine;
static int LTT_dpi = 72; /* FIXME: this ought to be a part of the call interface */
static int LTT_hinted = 1; /* FIXME: this too */
/*
* FreeType interface
*/
/*
=item init_tt()
Initializes the freetype font rendering engine
=cut
*/
static undef_int
i_init_tt(void) {
TT_Error error;
TT_Byte palette[] = { 0, 64, 127, 191, 255 };
i_clear_error();
mm_log((1,"init_tt()\n"));
error = TT_Init_FreeType( &engine );
if ( error ){
mm_log((1,"Initialization of freetype failed, code = 0x%x\n",
(unsigned)error));
i_tt_push_error(error);
i_push_error(0, "Could not initialize freetype 1.x");
return(1);
}
#ifdef FTXPOST
error = TT_Init_Post_Extension( engine );
if (error) {
mm_log((1, "Initialization of Post extension failed = 0x%x\n",
(unsigned)error));
i_tt_push_error(error);
i_push_error(0, "Could not initialize FT 1.x POST extension");
return 1;
}
#endif
error = TT_Set_Raster_Gray_Palette(engine, palette);
if (error) {
mm_log((1, "Initialization of gray levels failed = 0x%x\n",
(unsigned)error));
i_tt_push_error(error);
i_push_error(0, "Could not initialize FT 1.x POST extension");
return 1;
}
TT_initialized = 1;
return(0);
}
/*
=item i_tt_get_instance(handle, points, smooth)
Finds a points+smooth instance or if one doesn't exist in the cache
allocates room and returns its cache entry
fontname - path to the font to load
handle - handle to the font.
points - points of the requested font
smooth - boolean (True: antialias on, False: antialias is off)
=cut
*/
static
int
i_tt_get_instance( TT_Fonthandle *handle, i_img_dim points, int smooth ) {
int i,idx;
TT_Error error;
mm_log((1,"i_tt_get_instance(handle %p, points %" i_DF ", smooth %d)\n",
handle, i_DFc(points), smooth));
if (smooth == -1) { /* Smooth doesn't matter for this search */
for(i=0;i<TT_CHC;i++) {
if (handle->instanceh[i].ptsize==points) {
mm_log((1,"i_tt_get_instance: in cache - (non selective smoothing search) returning %d\n",i));
return i;
}
}
smooth=1; /* We will be adding a font - add it as smooth then */
} else { /* Smooth doesn't matter for this search */
for(i=0;i<TT_CHC;i++) {
if (handle->instanceh[i].ptsize == points
&& handle->instanceh[i].smooth == smooth) {
mm_log((1,"i_tt_get_instance: in cache returning %d\n",i));
return i;
}
}
}
/* Found the instance in the cache - return the cache index */
for(idx=0;idx<TT_CHC;idx++) {
if (!(handle->instanceh[idx].order)) break; /* find the lru item */
}
mm_log((1,"i_tt_get_instance: lru item is %d\n",idx));
mm_log((1,"i_tt_get_instance: lru pointer %p\n",
USTRCT(handle->instanceh[idx].instance) ));
if ( USTRCT(handle->instanceh[idx].instance) ) {
mm_log((1,"i_tt_get_instance: freeing lru item from cache %d\n",idx));
/* Free cached glyphs */
for(i=0;i<256;i++)
if ( USTRCT(handle->instanceh[idx].glyphs[i].glyph) )
TT_Done_Glyph( handle->instanceh[idx].glyphs[i].glyph );
for(i=0;i<256;i++) {
handle->instanceh[idx].glyphs[i].ch = TT_NOCHAR;
USTRCT(handle->instanceh[idx].glyphs[i].glyph)=NULL;
}
/* Free instance if needed */
TT_Done_Instance( handle->instanceh[idx].instance );
}
/* create and initialize instance */
/* FIXME: probably a memory leak on fail */
(void) (( error = TT_New_Instance( handle->face, &handle->instanceh[idx].instance ) ) ||
( error = TT_Set_Instance_Resolutions( handle->instanceh[idx].instance, LTT_dpi, LTT_dpi ) ) ||
( error = TT_Set_Instance_CharSize( handle->instanceh[idx].instance, points*64 ) ) );
if ( error ) {
mm_log((1, "Could not create and initialize instance: error %x.\n",
(unsigned)error ));
return -1;
}
/* Now that the instance should the inplace we need to lower all of the
ru counts and put `this' one with the highest entry */
for(i=0;i<TT_CHC;i++) handle->instanceh[i].order--;
handle->instanceh[idx].order=TT_CHC-1;
handle->instanceh[idx].ptsize=points;
handle->instanceh[idx].smooth=smooth;
TT_Get_Instance_Metrics( handle->instanceh[idx].instance, &(handle->instanceh[idx].imetrics) );
/* Zero the memory for the glyph storage so they are not thought as
cached if they haven't been cached since this new font was loaded */
for(i=0;i<256;i++) {
handle->instanceh[idx].glyphs[i].ch = TT_NOCHAR;
USTRCT(handle->instanceh[idx].glyphs[i].glyph)=NULL;
}
return idx;
}
/*
=item i_tt_new(fontname)
Creates a new font handle object, finds a character map and initialise the
the font handle's cache
fontname - path to the font to load
=cut
*/
TT_Fonthandle*
i_tt_new(const char *fontname) {
TT_Error error;
TT_Fonthandle *handle;
unsigned short i,n;
unsigned short platform,encoding;
if (!TT_initialized && i_init_tt()) {
i_push_error(0, "Could not initialize FT1 engine");
return NULL;
}
i_clear_error();
mm_log((1,"i_tt_new(fontname '%s')\n",fontname));
/* allocate memory for the structure */
handle = mymalloc( sizeof(TT_Fonthandle) ); /* checked 5Nov05 tonyc */
/* load the typeface */
error = TT_Open_Face( engine, fontname, &handle->face );
if ( error ) {
if ( error == TT_Err_Could_Not_Open_File ) {
mm_log((1, "Could not find/open %s.\n", fontname ));
}
else {
mm_log((1, "Error while opening %s, error code = 0x%x.\n",fontname,
(unsigned)error ));
}
i_tt_push_error(error);
return NULL;
}
TT_Get_Face_Properties( handle->face, &(handle->properties) );
/* First, look for a Unicode charmap */
n = handle->properties.num_CharMaps;
USTRCT( handle->char_map )=NULL; /* Invalidate character map */
for ( i = 0; i < n; i++ ) {
TT_Get_CharMap_ID( handle->face, i, &platform, &encoding );
if ( (platform == 3 && encoding == 1 )
|| (platform == 0 && encoding == 0 ) ) {
mm_log((2,"i_tt_new - found char map platform %u encoding %u\n",
platform, encoding));
TT_Get_CharMap( handle->face, i, &(handle->char_map) );
break;
}
}
if (!USTRCT(handle->char_map) && n != 0) {
/* just use the first one */
TT_Get_CharMap( handle->face, 0, &(handle->char_map));
}
/* Zero the pointsizes - and ordering */
for(i=0;i<TT_CHC;i++) {
USTRCT(handle->instanceh[i].instance)=NULL;
handle->instanceh[i].order=i;
handle->instanceh[i].ptsize=0;
handle->instanceh[i].smooth=-1;
}
#ifdef FTXPOST
handle->loaded_names = 0;
#endif
mm_log((1,"i_tt_new <- %p\n",handle));
return handle;
}
/*
* raster map management
*/
/*
=item i_tt_init_raster_map(bit, width, height, smooth)
Allocates internal memory for the bitmap as needed by the parameters (internal)
bit - bitmap to allocate into
width - width of the bitmap
height - height of the bitmap
smooth - boolean (True: antialias on, False: antialias is off)
=cut
*/
static
void
i_tt_init_raster_map( TT_Raster_Map* bit, i_img_dim width, i_img_dim height, int smooth ) {
mm_log((1,"i_tt_init_raster_map( bit %p, width %" i_DF ", height %" i_DF
", smooth %d)\n", bit, i_DFc(width), i_DFc(height), smooth));
bit->rows = height;
bit->width = ( width + 3 ) & -4;
bit->flow = TT_Flow_Down;
if ( smooth ) {
bit->cols = bit->width;
bit->size = bit->rows * bit->width;
} else {
bit->cols = ( bit->width + 7 ) / 8; /* convert to # of bytes */
bit->size = bit->rows * bit->cols; /* number of bytes in buffer */
}
/* rows can be 0 for some glyphs, for example ' ' */
if (bit->rows && bit->size / bit->rows != bit->cols) {
i_fatal(0, "Integer overflow calculating bitmap size (%d, %d)\n",
bit->width, bit->rows);
}
mm_log((1,"i_tt_init_raster_map: bit->width %d, bit->cols %d, bit->rows %d, bit->size %ld)\n", bit->width, bit->cols, bit->rows, bit->size ));
bit->bitmap = (void *) mymalloc( bit->size ); /* checked 6Nov05 tonyc */
if ( !bit->bitmap ) i_fatal(0,"Not enough memory to allocate bitmap (%d)!\n",bit->size );
}
/*
=item i_tt_clear_raster_map(bit)
Frees the bitmap data and sets pointer to NULL (internal)
bit - bitmap to free
=cut
*/
static
void
i_tt_done_raster_map( TT_Raster_Map *bit ) {
myfree( bit->bitmap );
bit->bitmap = NULL;
}
/*
=item i_tt_clear_raster_map(bit)
Clears the specified bitmap (internal)
bit - bitmap to zero
=cut
*/
static
void
i_tt_clear_raster_map( TT_Raster_Map* bit ) {
memset( bit->bitmap, 0, bit->size );
}
/*
=item i_tt_blit_or(dst, src, x_off, y_off)
function that blits one raster map into another (internal)
dst - destination bitmap
src - source bitmap
x_off - x offset into the destination bitmap
y_off - y offset into the destination bitmap
=cut
*/
static
void
i_tt_blit_or( TT_Raster_Map *dst, TT_Raster_Map *src,i_img_dim x_off, i_img_dim y_off ) {
i_img_dim x, y;
i_img_dim x1, x2, y1, y2;
unsigned char *s, *d;
x1 = x_off < 0 ? -x_off : 0;
y1 = y_off < 0 ? -y_off : 0;
x2 = (int)dst->cols - x_off;
if ( x2 > src->cols ) x2 = src->cols;
y2 = (int)dst->rows - y_off;
if ( y2 > src->rows ) y2 = src->rows;
if ( x1 >= x2 ) return;
/* do the real work now */
for ( y = y1; y < y2; ++y ) {
s = ( (unsigned char*)src->bitmap ) + y * src->cols + x1;
d = ( (unsigned char*)dst->bitmap ) + ( y + y_off ) * dst->cols + x1 + x_off;
for ( x = x1; x < x2; ++x ) {
if (*s > *d)
*d = *s;
d++;
s++;
}
}
}
/* useful for debugging */
#if 0
static void dump_raster_map(FILE *out, TT_Raster_Map *bit ) {
int x, y;
fprintf(out, "cols %d rows %d flow %d\n", bit->cols, bit->rows, bit->flow);
for (y = 0; y < bit->rows; ++y) {
fprintf(out, "%2d:", y);
for (x = 0; x < bit->cols; ++x) {
if ((x & 7) == 0 && x) putc(' ', out);
fprintf(out, "%02x", ((unsigned char *)bit->bitmap)[y*bit->cols+x]);
}
putc('\n', out);
}
}
#endif
/*
=item i_tt_get_glyph(handle, inst, j)
Function to see if a glyph exists and if so cache it (internal)
handle - pointer to font handle
inst - font instance
j - charcode of glyph
=cut
*/
static
int
i_tt_get_glyph( TT_Fonthandle *handle, int inst, unsigned long j) {
unsigned short load_flags, code;
TT_Error error;
mm_log((1, "i_tt_get_glyph(handle %p, inst %d, j %lu (%c))\n",
handle,inst,j, (int)((j >= ' ' && j <= '~') ? j : '.')));
/*mm_log((1, "handle->instanceh[inst].glyphs[j]=0x%08X\n",handle->instanceh[inst].glyphs[j] ));*/
if ( TT_VALID(handle->instanceh[inst].glyphs[TT_HASH(j)].glyph)
&& handle->instanceh[inst].glyphs[TT_HASH(j)].ch == j) {
mm_log((1,"i_tt_get_glyph: %lu in cache\n",j));
return 1;
}
if ( TT_VALID(handle->instanceh[inst].glyphs[TT_HASH(j)].glyph) ) {
/* clean up the entry */
TT_Done_Glyph( handle->instanceh[inst].glyphs[TT_HASH(j)].glyph );
USTRCT( handle->instanceh[inst].glyphs[TT_HASH(j)].glyph ) = NULL;
handle->instanceh[inst].glyphs[TT_HASH(j)].ch = TT_NOCHAR;
}
/* Ok - it wasn't cached - try to get it in */
load_flags = TTLOAD_SCALE_GLYPH;
if ( LTT_hinted ) load_flags |= TTLOAD_HINT_GLYPH;
if ( !TT_VALID(handle->char_map) ) {
code = (j - ' ' + 1) < 0 ? 0 : (j - ' ' + 1);
if ( code >= handle->properties.num_Glyphs ) code = 0;
} else code = TT_Char_Index( handle->char_map, j );
if ( (error = TT_New_Glyph( handle->face, &handle->instanceh[inst].glyphs[TT_HASH(j)].glyph)) ) {
mm_log((1, "Cannot allocate and load glyph: error %#x.\n", (unsigned)error ));
i_push_error(error, "TT_New_Glyph()");
return 0;
}
if ( (error = TT_Load_Glyph( handle->instanceh[inst].instance, handle->instanceh[inst].glyphs[TT_HASH(j)].glyph, code, load_flags)) ) {
mm_log((1, "Cannot allocate and load glyph: error %#x.\n", (unsigned)error ));
/* Don't leak */
TT_Done_Glyph( handle->instanceh[inst].glyphs[TT_HASH(j)].glyph );
USTRCT( handle->instanceh[inst].glyphs[TT_HASH(j)].glyph ) = NULL;
i_push_error(error, "TT_Load_Glyph()");
return 0;
}
/* At this point the glyph should be allocated and loaded */
handle->instanceh[inst].glyphs[TT_HASH(j)].ch = j;
/* Next get the glyph metrics */
error = TT_Get_Glyph_Metrics( handle->instanceh[inst].glyphs[TT_HASH(j)].glyph,
&handle->instanceh[inst].gmetrics[TT_HASH(j)] );
if (error) {
mm_log((1, "TT_Get_Glyph_Metrics: error %#x.\n", (unsigned)error ));
TT_Done_Glyph( handle->instanceh[inst].glyphs[TT_HASH(j)].glyph );
USTRCT( handle->instanceh[inst].glyphs[TT_HASH(j)].glyph ) = NULL;
handle->instanceh[inst].glyphs[TT_HASH(j)].ch = TT_NOCHAR;
i_push_error(error, "TT_Get_Glyph_Metrics()");
return 0;
}
return 1;
}
/*
=item i_tt_has_chars(handle, text, len, utf8, out)
Check if the given characters are defined by the font. Note that len
is the number of bytes, not the number of characters (when utf8 is
non-zero).
Returns the number of characters that were checked.
=cut
*/
size_t
i_tt_has_chars(TT_Fonthandle *handle, char const *text, size_t len, int utf8,
char *out) {
size_t count = 0;
mm_log((1, "i_tt_has_chars(handle %p, text %p, len %ld, utf8 %d)\n",
handle, text, (long)len, utf8));
while (len) {
unsigned long c;
int index;
if (utf8) {
c = i_utf8_advance(&text, &len);
if (c == ~0UL) {
i_push_error(0, "invalid UTF8 character");
return 0;
}
}
else {
c = (unsigned char)*text++;
--len;
}
if (TT_VALID(handle->char_map)) {
index = TT_Char_Index(handle->char_map, c);
}
else {
index = (c - ' ' + 1) < 0 ? 0 : (c - ' ' + 1);
if (index >= handle->properties.num_Glyphs)
index = 0;
}
*out++ = index != 0;
++count;
}
return count;
}
/*
=item i_tt_destroy(handle)
Clears the data taken by a font including all cached data such as
pixmaps and glyphs
handle - pointer to font handle
=cut
*/
void
i_tt_destroy( TT_Fonthandle *handle) {
TT_Close_Face( handle->face );
myfree( handle );
/* FIXME: Should these be freed automatically by the library?
TT_Done_Instance( instance );
void
i_tt_done_glyphs( void ) {
int i;
if ( !glyphs ) return;
for ( i = 0; i < 256; ++i ) TT_Done_Glyph( glyphs[i] );
free( glyphs );
glyphs = NULL;
}
*/
}
/*
* FreeType Rendering functions
*/
/*
=item i_tt_render_glyph(handle, gmetrics, bit, smallbit, x_off, y_off, smooth)
Renders a single glyph into the bit rastermap (internal)
handle - pointer to font handle
gmetrics - the metrics for the glyph to be rendered
bit - large bitmap that is the destination for the text
smallbit - small bitmap that is used only if smooth is true
x_off - x offset of glyph
y_off - y offset of glyph
smooth - boolean (True: antialias on, False: antialias is off)
=cut
*/
static
void
i_tt_render_glyph( TT_Glyph glyph, TT_Glyph_Metrics* gmetrics, TT_Raster_Map *bit, TT_Raster_Map *small_bit, i_img_dim x_off, i_img_dim y_off, int smooth ) {
mm_log((1,"i_tt_render_glyph(glyph %p, gmetrics %p, bit %p, small_bit %p, x_off %" i_DF ", y_off %" i_DF ", smooth %d)\n",
USTRCT(glyph), gmetrics, bit, small_bit, i_DFc(x_off),
i_DFc(y_off), smooth));
if ( !smooth ) TT_Get_Glyph_Bitmap( glyph, bit, x_off * 64, y_off * 64);
else {
TT_F26Dot6 xmin, ymin, xmax, ymax;
xmin = gmetrics->bbox.xMin & -64;
ymin = gmetrics->bbox.yMin & -64;
xmax = (gmetrics->bbox.xMax + 63) & -64;
ymax = (gmetrics->bbox.yMax + 63) & -64;
i_tt_clear_raster_map( small_bit );
TT_Get_Glyph_Pixmap( glyph, small_bit, -xmin, -ymin );
i_tt_blit_or( bit, small_bit, xmin/64 + x_off, -ymin/64 - y_off );
}
}
/*
=item i_tt_render_all_glyphs(handle, inst, bit, small_bit, cords, txt, len, smooth)
calls i_tt_render_glyph to render each glyph into the bit rastermap (internal)
handle - pointer to font handle
inst - font instance
bit - large bitmap that is the destination for the text
smallbit - small bitmap that is used only if smooth is true
txt - string to render
len - length of the string to render
smooth - boolean (True: antialias on, False: antialias is off)
=cut
*/
static
int
i_tt_render_all_glyphs( TT_Fonthandle *handle, int inst, TT_Raster_Map *bit,
TT_Raster_Map *small_bit, i_img_dim cords[6],
char const* txt, size_t len, int smooth, int utf8 ) {
unsigned long j;
TT_F26Dot6 x,y;
mm_log((1,"i_tt_render_all_glyphs( handle %p, inst %d, bit %p, small_bit %p, txt '%.*s', len %ld, smooth %d, utf8 %d)\n",
handle, inst, bit, small_bit, (int)len, txt, (long)len, smooth, utf8));
/*
y=-( handle->properties.horizontal->Descender * handle->instanceh[inst].imetrics.y_ppem )/(handle->properties.header->Units_Per_EM);
*/
x=-cords[0]; /* FIXME: If you font is antialiased this should be expanded by one to allow for aa expansion and the allocation too - do before passing here */
y=-cords[4];
while (len) {
if (utf8) {
j = i_utf8_advance(&txt, &len);
if (j == ~0UL) {
i_push_error(0, "invalid UTF8 character");
return 0;
}
}
else {
j = (unsigned char)*txt++;
--len;
}
if ( !i_tt_get_glyph(handle,inst,j) )
continue;
i_tt_render_glyph( handle->instanceh[inst].glyphs[TT_HASH(j)].glyph,
&handle->instanceh[inst].gmetrics[TT_HASH(j)], bit,
small_bit, x, y, smooth );
x += handle->instanceh[inst].gmetrics[TT_HASH(j)].advance / 64;
}
return 1;
}
/*
* Functions to render rasters (single channel images) onto images
*/
/*
=item i_tt_dump_raster_map2(im, bit, xb, yb, cl, smooth)
Function to dump a raster onto an image in color used by i_tt_text() (internal).
im - image to dump raster on
bit - bitmap that contains the text to be dumped to im
xb, yb - coordinates, left edge and baseline
cl - color to use for text
smooth - boolean (True: antialias on, False: antialias is off)
=cut
*/
static
void
i_tt_dump_raster_map2( i_img* im, TT_Raster_Map* bit, i_img_dim xb, i_img_dim yb, const i_color *cl, int smooth ) {
unsigned char *bmap;
i_img_dim x, y;
mm_log((1,"i_tt_dump_raster_map2(im %p, bit %p, xb %" i_DF ", yb %" i_DF ", cl %p)\n",
im, bit, i_DFc(xb), i_DFc(yb), cl));
bmap = bit->bitmap;
if ( smooth ) {
i_render r;
i_render_init(&r, im, bit->cols);
for(y=0;y<bit->rows;y++) {
i_render_color(&r, xb, yb+y, bit->cols, bmap + y*bit->cols, cl);
}
i_render_done(&r);
} else {
for(y=0;y<bit->rows;y++) {
unsigned mask = 0x80;
unsigned char *p = bmap + y * bit->cols;
for(x = 0; x < bit->width; x++) {
if (*p & mask) {
i_ppix(im, x+xb, y+yb, cl);
}
mask >>= 1;
if (!mask) {
mask = 0x80;
++p;
}
}
}
}
}
/*
=item i_tt_dump_raster_map_channel(im, bit, xb, yb, channel, smooth)
Function to dump a raster onto a single channel image in color (internal)
im - image to dump raster on
bit - bitmap that contains the text to be dumped to im
xb, yb - coordinates, left edge and baseline
channel - channel to copy to
smooth - boolean (True: antialias on, False: antialias is off)
=cut
*/
static
void
i_tt_dump_raster_map_channel( i_img* im, TT_Raster_Map* bit, i_img_dim xb, i_img_dim yb, int channel, int smooth ) {
unsigned char *bmap;
i_color val;
int c;
i_img_dim x,y;
int old_mask = im->ch_mask;
im->ch_mask = 1 << channel;
mm_log((1,"i_tt_dump_raster_channel(im %p, bit %p, xb %" i_DF ", yb %" i_DF ", channel %d)\n",
im, bit, i_DFc(xb), i_DFc(yb), channel));
bmap = bit->bitmap;
if ( smooth ) {
for(y=0;y<bit->rows;y++) for(x=0;x<bit->width;x++) {
c = bmap[y*(bit->cols)+x];
val.channel[channel] = c;
i_ppix(im,x+xb,y+yb,&val);
}
} else {
for(y=0;y<bit->rows;y++) {
unsigned mask = 0x80;
unsigned char *p = bmap + y * bit->cols;
for(x=0;x<bit->width;x++) {
val.channel[channel] = (*p & mask) ? 255 : 0;
i_ppix(im,x+xb,y+yb,&val);
mask >>= 1;
if (!mask) {
++p;
mask = 0x80;
}
}
}
}
im->ch_mask = old_mask;
}
/*
=item i_tt_rasterize(handle, bit, cords, points, txt, len, smooth)
interface for generating single channel raster of text (internal)
handle - pointer to font handle
bit - the bitmap that is allocated, rendered into and NOT freed
cords - the bounding box (modified in place)
points - font size to use
txt - string to render
len - length of the string to render
smooth - boolean (True: antialias on, False: antialias is off)
=cut
*/
static
int
i_tt_rasterize( TT_Fonthandle *handle, TT_Raster_Map *bit, i_img_dim cords[6], double points, char const* txt, size_t len, int smooth, int utf8 ) {
int inst;
i_img_dim width, height;
TT_Raster_Map small_bit;
/* find or install an instance */
if ( (inst=i_tt_get_instance(handle,points,smooth)) < 0) {
mm_log((1,"i_tt_rasterize: get instance failed\n"));
return 0;
}
/* calculate bounding box */
if (!i_tt_bbox_inst( handle, inst, txt, len, cords, utf8 ))
return 0;
width = cords[2]-cords[0];
height = cords[5]-cords[4];
mm_log((1,"i_tt_rasterize: width=%" i_DF ", height=%" i_DF "\n",
i_DFc(width), i_DFc(height) ));
i_tt_init_raster_map ( bit, width, height, smooth );
i_tt_clear_raster_map( bit );
if ( smooth ) i_tt_init_raster_map( &small_bit, handle->instanceh[inst].imetrics.x_ppem + 32, height, smooth );
if (!i_tt_render_all_glyphs( handle, inst, bit, &small_bit, cords, txt, len,
smooth, utf8 )) {
if ( smooth )
i_tt_done_raster_map( &small_bit );
return 0;
}
if ( smooth ) i_tt_done_raster_map( &small_bit );
return 1;
}
/*
* Exported text rendering interfaces
*/
/*
=item i_tt_cp(handle, im, xb, yb, channel, points, txt, len, smooth, utf8)
Interface to text rendering into a single channel in an image
handle - pointer to font handle
im - image to render text on to
xb, yb - coordinates, left edge and baseline
channel - channel to render into
points - font size to use
txt - string to render
len - length of the string to render
smooth - boolean (True: antialias on, False: antialias is off)
=cut
*/