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|
// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
rendfont.c
Rendering system font management.
***************************************************************************/
#include "emu.h"
#include "rendfont.h"
#include "rendutil.h"
#include "emuopts.h"
#include <zlib.h>
#include "osdepend.h"
#include "uismall.fh"
//**************************************************************************
// INLINE FUNCTIONS
//**************************************************************************
//-------------------------------------------------
// next_line - return a pointer to the start of
// the next line
//-------------------------------------------------
inline const char *next_line(const char *ptr)
{
// scan forward until we hit the end or a carriage return
while (*ptr != 13 && *ptr != 10 && *ptr != 0) ptr++;
// if we hit the end, return NULL
if (*ptr == 0)
return NULL;
// eat the trailing linefeed if present
if (*++ptr == 10)
ptr++;
return ptr;
}
//-------------------------------------------------
// get_char - return a pointer to a character
// in a font, expanding if necessary
//-------------------------------------------------
inline render_font::glyph &render_font::get_char(unicode_char chnum)
{
static glyph dummy_glyph;
// grab the table; if none, return the dummy character
if (m_glyphs[chnum / 256].count() == 0 && m_format == FF_OSD)
m_glyphs[chnum / 256].resize(256);
if (m_glyphs[chnum / 256].count() == 0)
return dummy_glyph;
// if the character isn't generated yet, do it now
glyph &gl = m_glyphs[chnum / 256][chnum % 256];
if (!gl.bitmap.valid())
char_expand(chnum, gl);
// return the resulting character
return gl;
}
//**************************************************************************
// RENDER FONT
//**************************************************************************
//-------------------------------------------------
// render_font - constructor
//-------------------------------------------------
render_font::render_font(render_manager &manager, const char *filename)
: m_manager(manager),
m_format(FF_UNKNOWN),
m_height(0),
m_yoffs(0),
m_scale(1.0f),
m_rawsize(0),
m_osdfont(NULL)
{
// if this is an OSD font, we're done
if (filename != NULL)
{
m_osdfont = manager.machine().osd().font_alloc();
if (m_osdfont != NULL)
{
if (m_osdfont->open(manager.machine().options().font_path(), filename, m_height))
{
m_scale = 1.0f / (float)m_height;
m_format = FF_OSD;
return;
}
global_free(m_osdfont);
m_osdfont = NULL;
}
}
// if the filename is 'default' default to 'ui.bdf' for backwards compatibility
if (filename != NULL && core_stricmp(filename, "default") == 0)
filename = "ui.bdf";
// attempt to load the cached version of the font first
if (filename != NULL && load_cached_bdf(filename))
return;
// load the raw data instead
emu_file ramfile(OPEN_FLAG_READ);
file_error filerr = ramfile.open_ram(font_uismall, sizeof(font_uismall));
if (filerr == FILERR_NONE)
load_cached(ramfile, 0);
}
//-------------------------------------------------
// ~render_font - destructor
//-------------------------------------------------
render_font::~render_font()
{
// free all the subtables
for (int tablenum = 0; tablenum < 256; tablenum++)
for (int charnum = 0; charnum < m_glyphs[tablenum].count(); charnum++)
{
glyph &gl = m_glyphs[tablenum][charnum];
m_manager.texture_free(gl.texture);
}
// release the OSD font
if (m_osdfont != NULL)
{
m_osdfont->close();
global_free(m_osdfont);
}
}
//-------------------------------------------------
// char_expand - expand the raw data for a
// character into a bitmap
//-------------------------------------------------
void render_font::char_expand(unicode_char chnum, glyph &gl)
{
// if we're an OSD font, query the info
if (m_format == FF_OSD)
{
// we set bmwidth to -1 if we've previously queried and failed
if (gl.bmwidth == -1)
return;
// attempt to get the font bitmap; if we fail, set bmwidth to -1
if (!m_osdfont->get_bitmap(chnum, gl.bitmap, gl.width, gl.xoffs, gl.yoffs))
{
gl.bitmap.reset();
gl.bmwidth = -1;
return;
}
// populate the bmwidth/bmheight fields
gl.bmwidth = gl.bitmap.width();
gl.bmheight = gl.bitmap.height();
}
// other formats need to parse their data
else
{
// punt if nothing there
if (gl.bmwidth == 0 || gl.bmheight == 0 || gl.rawdata == NULL)
return;
// allocate a new bitmap of the size we need
gl.bitmap.allocate(gl.bmwidth, m_height);
gl.bitmap.fill(0);
// extract the data
const char *ptr = gl.rawdata;
UINT8 accum = 0, accumbit = 7;
for (int y = 0; y < gl.bmheight; y++)
{
int desty = y + m_height + m_yoffs - gl.yoffs - gl.bmheight;
UINT32 *dest = (desty >= 0 && desty < m_height) ? &gl.bitmap.pix32(desty) : NULL;
// text format
if (m_format == FF_TEXT)
{
// loop over bytes
for (int x = 0; x < gl.bmwidth; x += 4)
{
// scan for the next hex digit
int bits = -1;
while (*ptr != 13 && bits == -1)
{
if (*ptr >= '0' && *ptr <= '9')
bits = *ptr++ - '0';
else if (*ptr >= 'A' && *ptr <= 'F')
bits = *ptr++ - 'A' + 10;
else if (*ptr >= 'a' && *ptr <= 'f')
bits = *ptr++ - 'a' + 10;
else
ptr++;
}
// expand the four bits
if (dest != NULL)
{
*dest++ = (bits & 8) ? rgb_t(0xff,0xff,0xff,0xff) : rgb_t(0x00,0xff,0xff,0xff);
*dest++ = (bits & 4) ? rgb_t(0xff,0xff,0xff,0xff) : rgb_t(0x00,0xff,0xff,0xff);
*dest++ = (bits & 2) ? rgb_t(0xff,0xff,0xff,0xff) : rgb_t(0x00,0xff,0xff,0xff);
*dest++ = (bits & 1) ? rgb_t(0xff,0xff,0xff,0xff) : rgb_t(0x00,0xff,0xff,0xff);
}
}
// advance to the next line
ptr = next_line(ptr);
}
// cached format
else if (m_format == FF_CACHED)
{
for (int x = 0; x < gl.bmwidth; x++)
{
if (accumbit == 7)
accum = *ptr++;
if (dest != NULL)
*dest++ = (accum & (1 << accumbit)) ? rgb_t(0xff,0xff,0xff,0xff) : rgb_t(0x00,0xff,0xff,0xff);
accumbit = (accumbit - 1) & 7;
}
}
}
}
// wrap a texture around the bitmap
gl.texture = m_manager.texture_alloc(render_texture::hq_scale);
gl.texture->set_bitmap(gl.bitmap, gl.bitmap.cliprect(), TEXFORMAT_ARGB32);
}
//-------------------------------------------------
// get_char_texture_and_bounds - return the
// texture for a character and compute the
// bounds of the final bitmap
//-------------------------------------------------
render_texture *render_font::get_char_texture_and_bounds(float height, float aspect, unicode_char chnum, render_bounds &bounds)
{
glyph &gl = get_char(chnum);
// on entry, assume x0,y0 are the top,left coordinate of the cell and add
// the character bounding box to that position
float scale = m_scale * height;
bounds.x0 += float(gl.xoffs) * scale * aspect;
// compute x1,y1 from there based on the bitmap size
bounds.x1 = bounds.x0 + float(gl.bmwidth) * scale * aspect;
bounds.y1 = bounds.y0 + float(m_height) * scale;
// return the texture
return gl.texture;
}
//-------------------------------------------------
// get_scaled_bitmap_and_bounds - return a
// scaled bitmap and bounding rect for a char
//-------------------------------------------------
void render_font::get_scaled_bitmap_and_bounds(bitmap_argb32 &dest, float height, float aspect, unicode_char chnum, rectangle &bounds)
{
glyph &gl = get_char(chnum);
// on entry, assume x0,y0 are the top,left coordinate of the cell and add
// the character bounding box to that position
float scale = m_scale * height;
bounds.min_x = float(gl.xoffs) * scale * aspect;
bounds.min_y = 0;
// compute x1,y1 from there based on the bitmap size
bounds.set_width(float(gl.bmwidth) * scale * aspect);
bounds.set_height(float(m_height) * scale);
// if the bitmap isn't big enough, bail
if (dest.width() < bounds.width() || dest.height() < bounds.height())
return;
// if no texture, fill the target
if (gl.texture == NULL)
{
dest.fill(0);
return;
}
// scale the font
bitmap_argb32 tempbitmap(&dest.pix(0), bounds.width(), bounds.height(), dest.rowpixels());
render_texture::hq_scale(tempbitmap, gl.bitmap, gl.bitmap.cliprect(), NULL);
}
//-------------------------------------------------
// char_width - return the width of a character
// at the given height
//-------------------------------------------------
float render_font::char_width(float height, float aspect, unicode_char ch)
{
return float(get_char(ch).width) * m_scale * height * aspect;
}
//-------------------------------------------------
// string_width - return the width of a string
// at the given height
//-------------------------------------------------
float render_font::string_width(float height, float aspect, const char *string)
{
// loop over the string and accumulate widths
int totwidth = 0;
for (const unsigned char *ptr = (const unsigned char *)string; *ptr != 0; ptr++)
totwidth += get_char(*ptr).width;
// scale the final result based on height
return float(totwidth) * m_scale * height * aspect;
}
//-------------------------------------------------
// utf8string_width - return the width of a
// UTF8-encoded string at the given height
//-------------------------------------------------
float render_font::utf8string_width(float height, float aspect, const char *utf8string)
{
int length = strlen(utf8string);
// loop over the string and accumulate widths
int count;
int totwidth = 0;
for (int offset = 0; offset < length; offset += count)
{
unicode_char uchar;
count = uchar_from_utf8(&uchar, utf8string + offset, length - offset);
if (count == -1)
break;
if (uchar < 0x10000)
totwidth += get_char(uchar).width;
}
// scale the final result based on height
return float(totwidth) * m_scale * height * aspect;
}
//-------------------------------------------------
// load_cached_bdf - attempt to load a cached
// version of the BDF font 'filename'; if that
// fails, fall back on the regular BDF loader
// and create a new cached version
//-------------------------------------------------
bool render_font::load_cached_bdf(const char *filename)
{
// first try to open the BDF itself
emu_file file(manager().machine().options().font_path(), OPEN_FLAG_READ);
file_error filerr = file.open(filename);
if (filerr != FILERR_NONE)
return false;
// determine the file size and allocate memory
m_rawsize = file.size();
m_rawdata.resize(m_rawsize + 1);
// read the first chunk
UINT32 bytes = file.read(m_rawdata, MIN(CACHED_BDF_HASH_SIZE, m_rawsize));
if (bytes != MIN(CACHED_BDF_HASH_SIZE, m_rawsize))
return false;
// has the chunk
UINT32 hash = crc32(0, (const UINT8 *)&m_rawdata[0], bytes) ^ (UINT32)m_rawsize;
// create the cached filename, changing the 'F' to a 'C' on the extension
astring cachedname(filename);
cachedname.del(cachedname.len() - 3, 3).cat("bdc");
// attempt to open the cached version of the font
{
emu_file cachefile(manager().machine().options().font_path(), OPEN_FLAG_READ);
filerr = cachefile.open(cachedname);
if (filerr == FILERR_NONE)
{
// if we have a cached version, load it
bool result = load_cached(cachefile, hash);
// if that worked, we're done
if (result)
{
// don't do that - glyphs data point into this array ...
// m_rawdata.reset();
return true;
}
}
}
// read in the rest of the font
if (bytes < m_rawsize)
{
UINT32 read = file.read(m_rawdata + bytes, m_rawsize - bytes);
if (read != m_rawsize - bytes)
{
m_rawdata.reset();
return false;
}
}
// NULL-terminate the data and attach it to the font
m_rawdata[m_rawsize] = 0;
// load the BDF
bool result = load_bdf();
// if we loaded okay, create a cached one
if (result)
save_cached(cachedname, hash);
// close the file
return result;
}
//-------------------------------------------------
// load_bdf - parse and load a BDF font
//-------------------------------------------------
bool render_font::load_bdf()
{
// set the format to text
m_format = FF_TEXT;
// first find the FONTBOUNDINGBOX tag
const char *ptr;
for (ptr = m_rawdata; ptr != NULL; ptr = next_line(ptr))
{
// we only care about a tiny few fields
if (strncmp(ptr, "FONTBOUNDINGBOX ", 16) == 0)
{
int dummy1, dummy2;
if (sscanf(ptr + 16, "%d %d %d %d", &dummy1, &m_height, &dummy2, &m_yoffs) != 4)
return false;
break;
}
}
// compute the scale factor
m_scale = 1.0f / (float)m_height;
// now scan for characters
int charcount = 0;
for ( ; ptr != NULL; ptr = next_line(ptr))
{
// stop at ENDFONT
if (strncmp(ptr, "ENDFONT", 7) == 0)
break;
// once we hit a STARTCHAR, parse until the end
if (strncmp(ptr, "STARTCHAR ", 10) == 0)
{
int bmwidth = -1, bmheight = -1, xoffs = -1, yoffs = -1;
const char *rawdata = NULL;
int charnum = -1;
int width = -1;
// scan for interesting per-character tags
for ( ; ptr != NULL; ptr = next_line(ptr))
{
// ENCODING tells us which character
if (strncmp(ptr, "ENCODING ", 9) == 0)
{
if (sscanf(ptr + 9, "%d", &charnum) != 1)
return 1;
}
// DWIDTH tells us the width to the next character
else if (strncmp(ptr, "DWIDTH ", 7) == 0)
{
int dummy1;
if (sscanf(ptr + 7, "%d %d", &width, &dummy1) != 2)
return 1;
}
// BBX tells us the height/width of the bitmap and the offsets
else if (strncmp(ptr, "BBX ", 4) == 0)
{
if (sscanf(ptr + 4, "%d %d %d %d", &bmwidth, &bmheight, &xoffs, &yoffs) != 4)
return 1;
}
// BITMAP is the start of the data
else if (strncmp(ptr, "BITMAP", 6) == 0)
{
// stash the raw pointer and scan for the end of the character
for (rawdata = ptr = next_line(ptr); ptr != NULL && strncmp(ptr, "ENDCHAR", 7) != 0; ptr = next_line(ptr)) ;
break;
}
}
// if we have everything, allocate a new character
if (charnum >= 0 && charnum < 65536 && rawdata != NULL && bmwidth >= 0 && bmheight >= 0)
{
// if we don't have a subtable yet, make one
if (m_glyphs[charnum / 256].count() == 0)
m_glyphs[charnum / 256].resize(256);
// fill in the entry
glyph &gl = m_glyphs[charnum / 256][charnum % 256];
gl.width = width;
gl.bmwidth = bmwidth;
gl.bmheight = bmheight;
gl.xoffs = xoffs;
gl.yoffs = yoffs;
gl.rawdata = rawdata;
}
// some progress for big fonts
if (++charcount % 256 == 0)
osd_printf_warning("Loading BDF font... (%d characters loaded)\n", charcount);
}
}
// make sure all the numbers are the same width
if (m_glyphs[0].count() > '9')
{
int maxwidth = 0;
for (int ch = '0'; ch <= '9'; ch++)
if (m_glyphs[0][ch].bmwidth > maxwidth)
maxwidth = m_glyphs[0][ch].width;
for (int ch = '0'; ch <= '9'; ch++)
m_glyphs[0][ch].width = maxwidth;
}
return true;
}
//-------------------------------------------------
// load_cached - load a font in cached format
//-------------------------------------------------
bool render_font::load_cached(emu_file &file, UINT32 hash)
{
// get the file size
UINT64 filesize = file.size();
// first read the header
UINT8 header[CACHED_HEADER_SIZE];
UINT32 bytes_read = file.read(header, CACHED_HEADER_SIZE);
if (bytes_read != CACHED_HEADER_SIZE)
return false;
// validate the header
if (header[0] != 'f' || header[1] != 'o' || header[2] != 'n' || header[3] != 't')
return false;
if (header[4] != (UINT8)(hash >> 24) || header[5] != (UINT8)(hash >> 16) || header[6] != (UINT8)(hash >> 8) || header[7] != (UINT8)hash)
return false;
m_height = (header[8] << 8) | header[9];
m_scale = 1.0f / (float)m_height;
m_yoffs = (INT16)((header[10] << 8) | header[11]);
UINT32 numchars = (header[12] << 24) | (header[13] << 16) | (header[14] << 8) | header[15];
if (filesize - CACHED_HEADER_SIZE < numchars * CACHED_CHAR_SIZE)
return false;
// now read the rest of the data
m_rawdata.resize(filesize - CACHED_HEADER_SIZE);
bytes_read = file.read(m_rawdata, filesize - CACHED_HEADER_SIZE);
if (bytes_read != filesize - CACHED_HEADER_SIZE)
{
m_rawdata.reset();
return false;
}
// extract the data from the data
UINT64 offset = numchars * CACHED_CHAR_SIZE;
for (int chindex = 0; chindex < numchars; chindex++)
{
const UINT8 *info = reinterpret_cast<UINT8 *>(&m_rawdata[chindex * CACHED_CHAR_SIZE]);
int chnum = (info[0] << 8) | info[1];
// if we don't have a subtable yet, make one
if (m_glyphs[chnum / 256].count() == 0)
m_glyphs[chnum / 256].resize(256);
// fill in the entry
glyph &gl = m_glyphs[chnum / 256][chnum % 256];
gl.width = (info[2] << 8) | info[3];
gl.xoffs = (INT16)((info[4] << 8) | info[5]);
gl.yoffs = (INT16)((info[6] << 8) | info[7]);
gl.bmwidth = (info[8] << 8) | info[9];
gl.bmheight = (info[10] << 8) | info[11];
gl.rawdata = (char *)m_rawdata + offset;
// advance the offset past the character
offset += (gl.bmwidth * gl.bmheight + 7) / 8;
if (offset > filesize - CACHED_HEADER_SIZE)
{
m_rawdata.reset();
return false;
}
}
// reuse the chartable as a temporary buffer
m_format = FF_CACHED;
return true;
}
//-------------------------------------------------
// save_cached - save a font in cached format
//-------------------------------------------------
bool render_font::save_cached(const char *filename, UINT32 hash)
{
osd_printf_warning("Generating cached BDF font...\n");
// attempt to open the file
emu_file file(manager().machine().options().font_path(), OPEN_FLAG_WRITE | OPEN_FLAG_CREATE);
file_error filerr = file.open(filename);
if (filerr != FILERR_NONE)
return false;
// determine the number of characters
int numchars = 0;
for (int chnum = 0; chnum < 65536; chnum++)
{
if (m_glyphs[chnum / 256].count() > 0)
{
glyph &gl = m_glyphs[chnum / 256][chnum % 256];
if (gl.width > 0)
numchars++;
}
}
try
{
// allocate an array to hold the character data
dynamic_buffer chartable(numchars * CACHED_CHAR_SIZE, 0);
// allocate a temp buffer to compress into
dynamic_buffer tempbuffer(65536);
// write the header
UINT8 *dest = tempbuffer;
*dest++ = 'f';
*dest++ = 'o';
*dest++ = 'n';
*dest++ = 't';
*dest++ = hash >> 24;
*dest++ = hash >> 16;
*dest++ = hash >> 8;
*dest++ = hash & 0xff;
*dest++ = m_height >> 8;
*dest++ = m_height & 0xff;
*dest++ = m_yoffs >> 8;
*dest++ = m_yoffs & 0xff;
*dest++ = numchars >> 24;
*dest++ = numchars >> 16;
*dest++ = numchars >> 8;
*dest++ = numchars & 0xff;
assert(dest - tempbuffer == CACHED_HEADER_SIZE);
UINT32 bytes_written = file.write(tempbuffer, dest - tempbuffer);
if (bytes_written != dest - tempbuffer)
throw emu_fatalerror("Error writing cached file");
// write the empty table to the beginning of the file
bytes_written = file.write(chartable, numchars * CACHED_CHAR_SIZE);
if (bytes_written != numchars * CACHED_CHAR_SIZE)
throw emu_fatalerror("Error writing cached file");
// loop over all characters
int tableindex = 0;
for (int chnum = 0; chnum < 65536; chnum++)
{
glyph &gl = get_char(chnum);
if (gl.width > 0)
{
// write out a bit-compressed bitmap if we have one
if (gl.bitmap.valid())
{
// write the data to the tempbuffer
dest = tempbuffer;
UINT8 accum = 0;
UINT8 accbit = 7;
// bit-encode the character data
for (int y = 0; y < gl.bmheight; y++)
{
int desty = y + m_height + m_yoffs - gl.yoffs - gl.bmheight;
const UINT32 *src = (desty >= 0 && desty < m_height) ? &gl.bitmap.pix32(desty) : NULL;
for (int x = 0; x < gl.bmwidth; x++)
{
if (src != NULL && rgb_t(src[x]).a() != 0)
accum |= 1 << accbit;
if (accbit-- == 0)
{
*dest++ = accum;
accum = 0;
accbit = 7;
}
}
}
// flush any extra
if (accbit != 7)
*dest++ = accum;
// write the data
bytes_written = file.write(tempbuffer, dest - tempbuffer);
if (bytes_written != dest - tempbuffer)
throw emu_fatalerror("Error writing cached file");
// free the bitmap and texture
m_manager.texture_free(gl.texture);
gl.bitmap.reset();
gl.texture = NULL;
}
// compute the table entry
dest = &chartable[tableindex++ * CACHED_CHAR_SIZE];
*dest++ = chnum >> 8;
*dest++ = chnum & 0xff;
*dest++ = gl.width >> 8;
*dest++ = gl.width & 0xff;
*dest++ = gl.xoffs >> 8;
*dest++ = gl.xoffs & 0xff;
*dest++ = gl.yoffs >> 8;
*dest++ = gl.yoffs & 0xff;
*dest++ = gl.bmwidth >> 8;
*dest++ = gl.bmwidth & 0xff;
*dest++ = gl.bmheight >> 8;
*dest++ = gl.bmheight & 0xff;
}
}
// seek back to the beginning and rewrite the table
file.seek(CACHED_HEADER_SIZE, SEEK_SET);
bytes_written = file.write(chartable, numchars * CACHED_CHAR_SIZE);
if (bytes_written != numchars * CACHED_CHAR_SIZE)
throw emu_fatalerror("Error writing cached file");
return true;
}
catch (...)
{
file.remove_on_close();
return false;
}
}
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