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netsurf/riscos/font.c

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/*
* This file is part of NetSurf, http://netsurf.sourceforge.net/
* Licensed under the GNU General Public License,
* http://www.opensource.org/licenses/gpl-license
* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
* Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
*/
/** \file
* Font handling (RISC OS implementation).
*
* The Font Manager is used to handle and render fonts.
*/
#include <assert.h>
#include <stdio.h>
#include "oslib/font.h"
#include "netsurf/css/css.h"
#include "netsurf/desktop/gui.h"
#include "netsurf/render/font.h"
#include "netsurf/riscos/gui.h"
#include "netsurf/utils/log.h"
#include "netsurf/utils/utils.h"
#define FONT_FAMILIES 5 /* Number of families */
#define FONT_FACES 8 /* Number of faces */
/* Font Variants */
#define FONT_SMALLCAPS 4
/* Font Styles */
#define FONT_BOLD 2
#define FONT_SLANTED 1
/* Font families */
#define FONT_SANS_SERIF (0 * FONT_FACES)
#define FONT_SERIF (1 * FONT_FACES)
#define FONT_MONOSPACE (2 * FONT_FACES)
#define FONT_CURSIVE (3 * FONT_FACES)
#define FONT_FANTASY (4 * FONT_FACES)
/* a font_set is just a linked list of font_data for each face for now */
struct font_set {
struct font_data *font[FONT_FAMILIES * FONT_FACES];
};
/** Table of font names.
*
* font id = font family * 8 + smallcaps * 4 + bold * 2 + slanted
*
* font family: 0 = sans-serif, 1 = serif, 2 = monospace, 3 = cursive
* 4 = fantasy
*/
const char * const font_table[FONT_FAMILIES * FONT_FACES] = {
/* sans-serif */
/*0*/ "Homerton.Medium\\ELatin1",
/*1*/ "Homerton.Medium.Oblique\\ELatin1",
/*2*/ "Homerton.Bold\\ELatin1",
/*3*/ "Homerton.Bold.Oblique\\ELatin1",
"Homerton.Medium.SmallCaps\\ELatin1",
"Homerton.Medium.SmallCaps\\ELatin1\\M65536 0 13930 65536 0 0",
"Homerton.Bold.SmallCaps\\ELatin1",
"Homerton.Bold.SmallCaps\\ELatin1\\M65536 0 13930 65536 0 0",
/* serif */
/*8*/ "Trinity.Medium\\ELatin1",
/*9*/ "Trinity.Medium.Italic\\ELatin1",
/*10*/ "Trinity.Bold\\ELatin1",
/*11*/ "Trinity.Bold.Italic\\ELatin1",
"Trinity.Medium.SmallCaps\\ELatin1",
"Trinity.Medium.Italic.SmallCaps\\ELatin1",
"Trinity.Bold.SmallCaps\\ELatin1",
"Trinity.Bold.Italic.SmallCaps\\ELatin1",
/* monospace */
/*16*/ "Corpus.Medium\\ELatin1",
/*17*/ "Corpus.Medium.Oblique\\ELatin1",
/*18*/ "Corpus.Bold\\ELatin1",
/*19*/ "Corpus.Bold.Oblique\\ELatin1",
"Corpus.Medium.SmallCaps\\ELatin1",
"Corpus.Medium.SmallCaps\\ELatin1\\M65536 0 13930 65536 0 0",
"Corpus.Bold.SmallCaps\\ELatin1",
"Corpus.Bold.SmallCaps\\ELatin1\\M65536 0 13930 65536 0 0",
/* cursive */
/*24*/ "Churchill.Medium\\ELatin1",
/*25*/ "Churchill.Medium\\ELatin1\\M65536 0 13930 65536 0 0",
/*26*/ "Churchill.Bold\\ELatin1",
/*27*/ "Churchill.Bold\\ELatin1\\M65536 0 13930 65536 0 0",
"Churchill.Medium.SmallCaps\\ELatin1",
"Churchill.Medium.SmallCaps\\ELatin1\\M65536 0 13930 65536 0 0",
"Churchill.Bold.SmallCaps\\ELatin1",
"Churchill.Bold.SmallCaps\\ELatin1\\M65536 0 13930 65536 0 0",
/* fantasy */
/*32*/ "Sassoon.Primary\\ELatin1",
/*33*/ "Sassoon.Primary\\ELatin1\\M65536 0 13930 65536 0 0",
/*34*/ "Sassoon.Primary.Bold\\ELatin1",
/*35*/ "Sassoon.Primary.Bold\\ELatin1\\M65536 0 13930 65536 0 0",
"Sassoon.Primary.SmallCaps\\ELatin1",
"Sassoon.Primary.SmallCaps\\ELatin1\\M65536 0 13930 65536 0 0",
"Sassoon.Primary.Bold.SmallCaps\\ELatin1",
"Sassoon.Primary.Bold.SmallCaps\\ELatin1\\M65536 0 13930 65536 0 0",
};
/**
* Create an empty font_set.
*
* \return an opaque struct font_set.
*/
struct font_set *font_new_set()
{
struct font_set *set = xcalloc(1, sizeof(*set));
unsigned int i;
for (i = 0; i < FONT_FAMILIES * FONT_FACES; i++)
set->font[i] = 0;
return set;
}
/**
* Font enumerator
*
* Call this multiple times to enumerate all available font names.
* *handle should be zero (0) on first call.
*
* Returns a NULL pointer and a handle of -1 if there are no more fonts.
*/
const char *enumerate_fonts(struct font_set* set, int *handle)
{
int i;
assert(set);
if (*handle < 0 || handle == 0) { /* a bit of sanity checking */
*handle = -1;
return NULL;
}
for (i = *handle; i!=FONT_FAMILIES*FONT_FACES && set->font[i]==0;
i++) ; /* find next font in use */
if (i == FONT_FAMILIES*FONT_FACES) { /* no more fonts */
*handle = -1;
return NULL;
}
*handle = i+1; /* update handle for next call */
return font_table[i];
}
/**
* Open a font for use based on a css_style.
*
* \param set a font_set, as returned by font_new_set()
* \param style a css_style which describes the font
* \return a struct font_data, with a RISC OS font handle in handle
*
* The set is updated to include the font, if it was not present.
*/
struct font_data *font_open(struct font_set *set, struct css_style *style)
{
struct font_data *data;
unsigned int size = option_font_size * 1.6;
unsigned int f = 0;
font_f handle;
os_error *error;
assert(set);
assert(style);
if (style->font_size.size == CSS_FONT_SIZE_LENGTH)
size = len(&style->font_size.value.length, style) *
72.0 / 90.0 * 16;
if (size < option_font_min_size * 1.6)
size = option_font_min_size * 1.6;
if (1600 < size)
size = 1600;
switch (style->font_family) {
case CSS_FONT_FAMILY_SANS_SERIF:
f += FONT_SANS_SERIF;
break;
case CSS_FONT_FAMILY_SERIF:
f += FONT_SERIF;
break;
case CSS_FONT_FAMILY_MONOSPACE:
f += FONT_MONOSPACE;
break;
case CSS_FONT_FAMILY_CURSIVE:
f += FONT_CURSIVE;
break;
case CSS_FONT_FAMILY_FANTASY:
f += FONT_FANTASY;
break;
default:
break;
}
switch (style->font_variant) {
case CSS_FONT_VARIANT_SMALL_CAPS:
f += FONT_SMALLCAPS;
break;
default:
break;
}
switch (style->font_weight) {
case CSS_FONT_WEIGHT_BOLD:
case CSS_FONT_WEIGHT_600:
case CSS_FONT_WEIGHT_700:
case CSS_FONT_WEIGHT_800:
case CSS_FONT_WEIGHT_900:
f += FONT_BOLD;
break;
default:
break;
}
switch (style->font_style) {
case CSS_FONT_STYLE_ITALIC:
case CSS_FONT_STYLE_OBLIQUE:
f += FONT_SLANTED;
break;
default:
break;
}
for (data = set->font[f]; data != 0; data = data->next)
if (data->size == size)
return data;
data = xcalloc(1, sizeof(*data));
error = xfont_find_font(font_table[f], (int)size, (int)size,
0, 0, &handle, 0, 0);
if (error) { /* fall back to Homerton */
LOG(("font_find_font failed; falling back to Homerton"));
error = xfont_find_font(font_table[f % 4],
(int)size, (int)size,
0, 0, &handle, 0, 0);
if (error) {
LOG(("%i: %s\n", error->errnum, error->errmess));
die("font_find_font failed");
}
}
data->id = f;
data->handle = handle;
data->size = size;
data->space_width = font_width(data, " ", 1);
data->next = set->font[f];
set->font[f] = data;
return data;
}
/**
* Frees all the fonts in a font_set.
*
* \param set a font_set as returned by font_new_set()
*/
void font_free_set(struct font_set *set)
{
unsigned int i;
struct font_data *data, *next;
assert(set != 0);
for (i = 0; i < FONT_FAMILIES * FONT_FACES; i++) {
for (data = set->font[i]; data != 0; data = next) {
next = data->next;
font_lose_font((font_f)(data->handle));
free(data);
}
}
free(set);
}
/**
* Find the width of some text in a font.
*
* \param font a font_data, as returned by font_open()
* \param text string to measure
* \param length length of text
* \return width of text in pixels
*/
unsigned long font_width(struct font_data *font, const char * text, unsigned int length)
{
int width;
os_error * error;
assert(font != 0 && text != 0);
if (length == 0)
return 0;
error = xfont_scan_string((font_f)(font->handle), text,
font_GIVEN_FONT | font_KERN | font_GIVEN_LENGTH,
0x7fffffff, 0x7fffffff,
0,
0, (int)length,
0, &width, 0, 0);
if (error != 0) {
fprintf(stderr, "%s\n", error->errmess);
die("font_width: font_scan_string failed");
}
return width / 800;
}
/**
* Find where in a string a x coordinate falls.
*
* For example, used to find where to position the caret in response to mouse
* click.
*
* \param text a string
* \param font a font_data, as returned by font_open()
* \param length length of text
* \param x horizontal position in pixels
* \param char_offset updated to give the offset in the string
* \param pixel_offset updated to give the coordinate of the character in pixels
*/
void font_position_in_string(const char *text, struct font_data *font,
unsigned int length, unsigned long x,
int *char_offset, int *pixel_offset)
{
font_scan_block block;
char *split_point;
int x_out, y_out, length_out;
os_error *error;
assert(font != 0 && text != 0);
block.space.x = block.space.y = 0;
block.letter.x = block.letter.y = 0;
block.split_char = -1;
error = xfont_scan_string((font_f)(font->handle), text,
font_GIVEN_BLOCK | font_GIVEN_FONT | font_KERN |
font_RETURN_CARET_POS | font_GIVEN_LENGTH,
x * 2 * 400,
0x7fffffff,
&block, 0, (int)length,
&split_point, &x_out, &y_out, &length_out);
if (error) {
fprintf(stderr, "%s\n", error->errmess);
die("font_width: font_scan_string failed");
}
*char_offset = (int)(split_point - text);
*pixel_offset = x_out / 2 / 400;
}
/**
* Find where to split a string to fit in a width.
*
* For example, used when wrapping paragraphs.
*
* \param data a font_data, as returned by font_open()
* \param text string to split
* \param length length of text
* \param width available width
* \param used_width updated to actual width used
* \return pointer to character which does not fit
*/
char * font_split(struct font_data *data, const char * text, unsigned int length,
unsigned int width, unsigned int *used_width)
{
os_error *error;
font_scan_block block;
char *split;
block.space.x = block.space.y = block.letter.x = block.letter.y = 0;
block.split_char = ' ';
error = xfont_scan_string((font_f)(data->handle), text,
font_GIVEN_BLOCK | font_GIVEN_FONT | font_KERN | font_GIVEN_LENGTH,
width * 2 * 400, 0x7fffffff,
&block,
0,
(int)length,
&split,
used_width, 0, 0);
if (error != 0) {
fprintf(stderr, "%s\n", error->errmess);
die("font_split: font_scan_string failed");
}
*used_width = *used_width / 2 / 400;
return split;
}
#ifdef TEST
int main(void)
{
unsigned int i;
struct font_set *set;
struct css_style style;
style.font_family = CSS_FONT_FAMILY_SANS_SERIF;
style.font_size.size = CSS_FONT_SIZE_LENGTH;
style.font_weight = CSS_FONT_WEIGHT_BOLD;
style.font_style = CSS_FONT_STYLE_ITALIC;
set = font_new_set();
for (i = 10; i != 100; i += 10) {
style.font_size.value.length.value = i;
font_open(set, &style);
}
font_free_set(set);
return 0;
}
#endif
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