mirror of
https://github.com/netsurf-browser/netsurf
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65b5ae0f8f
Font rewrite, part 3. Note that Draw export and printing are broken by these changes. svn path=/import/netsurf/; revision=1519
275 lines
7.2 KiB
C
275 lines
7.2 KiB
C
/*
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* This file is part of NetSurf, http://netsurf.sourceforge.net/
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* Licensed under the GNU General Public License,
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* http://www.opensource.org/licenses/gpl-license
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* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
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*/
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/** \file
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* Font handling (RISC OS implementation).
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*
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* The RUfl is used handle and render fonts.
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*/
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#include <assert.h>
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#include "rufl.h"
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#include "netsurf/css/css.h"
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#include "netsurf/render/font.h"
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#include "netsurf/riscos/gui.h"
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#include "netsurf/riscos/options.h"
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#include "netsurf/utils/log.h"
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static void nsfont_read_style(const struct css_style *style,
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const char **font_family, unsigned int *font_size,
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rufl_style *font_style);
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/**
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* Measure the width of a string.
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*
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* \param style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \param string UTF-8 string to measure
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* \param length length of string
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* \param width updated to width of string[0..length)
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* \return true on success, false on error and error reported
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*/
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bool nsfont_width(const struct css_style *style,
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const char *string, size_t length,
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int *width)
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{
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const char *font_family;
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unsigned int font_size;
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rufl_style font_style;
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rufl_code code;
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nsfont_read_style(style, &font_family, &font_size, &font_style);
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code = rufl_width(font_family, font_style, font_size,
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string, length,
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width);
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if (code != rufl_OK) {
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if (code == rufl_FONT_MANAGER_ERROR)
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LOG(("rufl_width: rufl_FONT_MANAGER_ERROR: 0x%x: %s",
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rufl_fm_error->errnum,
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rufl_fm_error->errmess));
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else
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LOG(("rufl_width: 0x%x", code));
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/* warn_user("MiscError", "font error"); */
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return false;
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}
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*width /= 2;
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return true;
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}
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/**
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* Find the position in a string where an x coordinate falls.
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*
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* \param style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \param string UTF-8 string to measure
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* \param length length of string
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* \param x x coordinate to search for
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* \param char_offset updated to offset in string of actual_x, [0..length]
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* \param actual_x updated to x coordinate of character closest to x
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* \return true on success, false on error and error reported
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*/
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bool nsfont_position_in_string(const struct css_style *style,
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const char *string, size_t length,
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int x, size_t *char_offset, int *actual_x)
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{
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const char *font_family;
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unsigned int font_size;
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rufl_style font_style;
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rufl_code code;
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nsfont_read_style(style, &font_family, &font_size, &font_style);
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code = rufl_x_to_offset(font_family, font_style, font_size,
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string, length,
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x * 2, char_offset, actual_x);
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if (code != rufl_OK) {
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if (code == rufl_FONT_MANAGER_ERROR)
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LOG(("rufl_x_to_offset: rufl_FONT_MANAGER_ERROR: "
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"0x%x: %s",
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rufl_fm_error->errnum,
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rufl_fm_error->errmess));
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else
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LOG(("rufl_x_to_offset: 0x%x", code));
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/* warn_user("MiscError", "font error"); */
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return false;
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}
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*actual_x /= 2;
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return true;
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}
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/**
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* Find where to split a string to make it fit a width.
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*
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* \param style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \param string UTF-8 string to measure
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* \param length length of string
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* \param x width available
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* \param char_offset updated to offset in string of actual_x, [0..length]
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* \param actual_x updated to x coordinate of character closest to x
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* \return true on success, false on error and error reported
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*
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* On exit, [char_offset == 0 ||
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* string[char_offset] == ' ' ||
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* char_offset == length]
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*/
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bool nsfont_split(const struct css_style *style,
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const char *string, size_t length,
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int x, size_t *char_offset, int *actual_x)
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{
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const char *font_family;
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unsigned int font_size;
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rufl_style font_style;
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rufl_code code;
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nsfont_read_style(style, &font_family, &font_size, &font_style);
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code = rufl_x_to_offset(font_family, font_style, font_size,
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string, length,
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x * 2, char_offset, actual_x);
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if (code != rufl_OK) {
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if (code == rufl_FONT_MANAGER_ERROR)
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LOG(("rufl_x_to_offset: rufl_FONT_MANAGER_ERROR: "
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"0x%x: %s",
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rufl_fm_error->errnum,
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rufl_fm_error->errmess));
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else
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LOG(("rufl_x_to_offset: 0x%x", code));
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/* warn_user("MiscError", "font error"); */
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return false;
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}
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while (*char_offset && string[*char_offset] != ' ')
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(*char_offset)--;
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code = rufl_width(font_family, font_style, font_size,
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string, *char_offset,
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actual_x);
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if (code != rufl_OK) {
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if (code == rufl_FONT_MANAGER_ERROR)
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LOG(("rufl_width: rufl_FONT_MANAGER_ERROR: 0x%x: %s",
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rufl_fm_error->errnum,
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rufl_fm_error->errmess));
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else
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LOG(("rufl_width: 0x%x", code));
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/* warn_user("MiscError", "font error"); */
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return false;
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}
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*actual_x /= 2;
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return true;
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}
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/**
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* Paint a string.
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*
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* \param style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \param string UTF-8 string to measure
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* \param length length of string
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* \param x x coordinate
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* \param y y coordinate
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* \param scale scale to apply to font size
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* \param bg background colour
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* \param c colour for text
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* \return true on success, false on error and error reported
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*/
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bool nsfont_paint(struct css_style *style, const char *string,
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size_t length, int x, int y, float scale)
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{
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const char *font_family;
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unsigned int font_size;
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rufl_style font_style;
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rufl_code code;
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nsfont_read_style(style, &font_family, &font_size, &font_style);
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code = rufl_paint(font_family, font_style, font_size * scale,
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string, length, x, y);
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if (code != rufl_OK) {
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if (code == rufl_FONT_MANAGER_ERROR)
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LOG(("rufl_width: rufl_FONT_MANAGER_ERROR: 0x%x: %s",
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rufl_fm_error->errnum,
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rufl_fm_error->errmess));
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else
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LOG(("rufl_width: 0x%x", code));
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}
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return true;
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}
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/**
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* Convert a css_style to a font family, size and rufl_style.
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*
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* \param style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \param font_family updated to font family
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* \param font_size updated to font size
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* \param font_style updated to font style
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*/
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void nsfont_read_style(const struct css_style *style,
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const char **font_family, unsigned int *font_size,
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rufl_style *font_style)
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{
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*font_family = "Homerton";
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assert(style->font_size.size == CSS_FONT_SIZE_LENGTH);
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*font_size = css_len2px(&style->font_size.value.length, style) *
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72.0 / 90.0 * 16.;
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if (*font_size < option_font_min_size * 1.6)
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*font_size = option_font_min_size * 1.6;
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if (1600 < *font_size)
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*font_size = 1600;
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switch (style->font_style) {
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case CSS_FONT_STYLE_ITALIC:
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case CSS_FONT_STYLE_OBLIQUE:
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*font_style = rufl_SLANTED;
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break;
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default:
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*font_style = rufl_REGULAR;
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break;
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}
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switch (style->font_weight) {
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case CSS_FONT_WEIGHT_BOLD:
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case CSS_FONT_WEIGHT_600:
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case CSS_FONT_WEIGHT_700:
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case CSS_FONT_WEIGHT_800:
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case CSS_FONT_WEIGHT_900:
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*font_style += rufl_BOLD;
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break;
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default:
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break;
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}
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}
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void nsfont_txtenum(void *font, const char *text,
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size_t length,
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unsigned int *width,
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const char **rofontname,
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const char **rotext,
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size_t *rolength,
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size_t *consumed) { }
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