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netradiant-custom/libs/gtkutil/glfont.cpp
Garux 9d3d204018 Qt
2022-10-27 09:10:31 +03:00

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/*
Copyright (C) 2001-2006, William Joseph.
All Rights Reserved.
This file is part of GtkRadiant.
GtkRadiant is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
GtkRadiant is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "glfont.h"
#include "igl.h"
#include <QFont>
#include <QFontDatabase>
#include <QFontMetrics>
#include <QPainter>
#include "stream/stringstream.h"
void gray_to_texture( const unsigned int x_max, const unsigned int y_max, const unsigned char *in, unsigned char *out, const unsigned char fontColorR, const unsigned char fontColorG, const unsigned char fontColorB ){ /* normal with shadow */
unsigned int x, y, bitmapIter = 0;
const unsigned char backgroundColorR = 0;
const unsigned char backgroundColorG = 0;
const unsigned char backgroundColorB = 0;
for( y = 0; y < y_max; y++ ) {
for( x = 0; x < x_max; x++ ) {
const unsigned int iter = ( y * x_max + x ) * 4;
if( x == 0 || y == 0 || x == 1 || y == 1 ) {
out[iter] = fontColorB;
out[iter + 1] = fontColorG;
out[iter + 2] = fontColorR;
out[iter + 3] = 0;
continue;
}
if( in[bitmapIter] == 0 ){
out[iter] = fontColorB;
out[iter + 1] = fontColorG;
out[iter + 2] = fontColorR;
out[iter + 3] = 0;
}
else{
out[iter] = backgroundColorB;
out[iter + 1] = backgroundColorG;
out[iter + 2] = backgroundColorR;
out[iter + 3] = in[bitmapIter];
}
++bitmapIter;
}
}
bitmapIter = 0;
for( y = 0; y < y_max; y++ ) {
for( x = 0; x < x_max; x++ ) {
const unsigned int iter = ( y * x_max + x ) * 4;
if( x == 0 || y == 0 || x == ( x_max - 1 ) || y == ( y_max - 1 ) ) {
continue;
}
if( in[bitmapIter] != 0 ) {
if( out[iter + 3] == 0 ){
out[iter] = fontColorB;
out[iter + 1] = fontColorG;
out[iter + 2] = fontColorR;
out[iter + 3] = in[bitmapIter];
}
else{
/* Calculate alpha (opacity). */
const float opacityFont = in[bitmapIter] / 255.f;
const float opacityBack = out[iter + 3] / 255.f;
out[iter] = fontColorB * opacityFont + ( 1 - opacityFont ) * backgroundColorB;
out[iter + 1] = fontColorG * opacityFont + ( 1 - opacityFont ) * backgroundColorG;
out[iter + 2] = fontColorR * opacityFont + ( 1 - opacityFont ) * backgroundColorR;
out[iter + 3] = ( opacityFont + ( 1 - opacityFont ) * opacityBack ) * 255.f;
}
}
++bitmapIter;
}
}
}
// generic string printing with call lists
class GLFontCallList final : public GLFont
{
GLuint m_displayList;
GLuint m_atlas;
QFont m_font;
QFontMetrics m_metrics;
const int m_pixelHeight;
const int m_pixelAscent;
const int m_pixelDescent;
public:
GLFontCallList( GLuint displayList, GLuint atlas, const QFont& font, const QFontMetrics& metrics ) :
m_displayList( displayList ), m_atlas( atlas ), m_font( font ), m_metrics( metrics ),
m_pixelHeight( m_metrics.height() ), m_pixelAscent( m_metrics.ascent() ), m_pixelDescent( m_metrics.descent() ){
}
~GLFontCallList(){
gl().glDeleteLists( m_displayList, 128 );
gl().glDeleteTextures( 1, &m_atlas );
}
void printString( const char *s ){
GLboolean rasterPosValid;
gl().glGetBooleanv( GL_CURRENT_RASTER_POSITION_VALID, &rasterPosValid );
if( !rasterPosValid )
return;
GLfloat rasterPos[4];
gl().glGetFloatv( GL_CURRENT_RASTER_POSITION, rasterPos );
GLint viewport[4];
gl().glGetIntegerv( GL_VIEWPORT, viewport );
gl().glMatrixMode( GL_PROJECTION );
gl().glPushMatrix();
gl().glLoadIdentity();
gl().glOrtho( viewport[0], viewport[2], viewport[1], viewport[3], -1, 1 );
gl().glMatrixMode( GL_MODELVIEW );
gl().glPushMatrix();
gl().glLoadIdentity();
gl().glTranslatef( rasterPos[0], rasterPos[1], 0 );
gl().glPushAttrib( GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT | GL_POLYGON_BIT );
gl().glDisable( GL_LIGHTING );
gl().glEnable( GL_TEXTURE_2D );
gl().glDisable( GL_DEPTH_TEST );
gl().glEnable( GL_BLEND );
gl().glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
gl().glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
gl().glBindTexture( GL_TEXTURE_2D, m_atlas );
gl().glListBase( m_displayList );
gl().glCallLists( GLsizei( strlen( s ) ), GL_UNSIGNED_BYTE, reinterpret_cast<const GLubyte*>( s ) );
gl().glPopAttrib();
gl().glMatrixMode( GL_PROJECTION );
gl().glPopMatrix();
gl().glMatrixMode( GL_MODELVIEW ); //! must leave GL_MODELVIEW mode, as renderer relies on this during Renderer.render()
gl().glPopMatrix();
}
void renderString( const char *s, const GLuint& tex, const unsigned char colour[3], unsigned int& out_wid, unsigned int& out_hei ){
// proper way would be using painter.metrics, however this requires it being active()...
// same for painter.boundingRect() + result is not correct wrt width for some reason
const QRect rect = m_metrics.boundingRect( s );
unsigned int wid = rect.width();
unsigned int hei = rect.height();
if ( wid > 0 && hei > 0 ) {
QImage image( wid, hei, QImage::Format::Format_Alpha8 );
image.fill( 0 );
QPainter painter;
painter.begin( &image );
painter.setFont( m_font );
painter.drawText( 0, m_metrics.height() - m_metrics.descent(), s );
painter.end();
// using image.constBits() is inconsistently buggy for some reason
unsigned char *boo = (unsigned char *) malloc( wid * hei );
for( unsigned int w = 0; w < wid; ++w )
for( unsigned int h = 0; h < hei; ++h )
boo[wid * h + w] = qAlpha( image.pixel( w, h ) );
hei += 2;
wid += 2;
unsigned char *buf = (unsigned char *) malloc( 4 * hei * wid );
memset( buf, 0x00, 4 * hei * wid );
#if 0
GLfloat color[4] = { 1, 0, 0, 1 };
guint32 rgb = ( ( ( guint32 )( color[0] * 255.0 ) ) << 24 ) |
( ( ( guint32 )( color[1] * 255.0 ) ) << 16 ) |
( ( ( guint32 )( color[2] * 255.0 ) ) << 8 );
GLfloat a = color[3];
guint32 *t;
guint8 *row, *row_end;
row = bitmap.buffer + bitmap.rows * bitmap.width; /* past-the-end */
row_end = bitmap.buffer; /* beginning */
t = ( guint32* ) buf;
if( a == 1.0 ) {
do {
row -= bitmap.width;
for( unsigned int i = 0; i < bitmap.width; i++ )
*t++ = rgb | ( ( guint32 ) row[i] );
} while( row != row_end );
} else
{
do
{
row -= bitmap.width;
for( unsigned int i = 0; i < bitmap.width; i++ )
* t++ = rgb | ( ( guint32 )( a* row[i] ) );
} while( row != row_end );
}
#endif // 0
#if 0
if( withfond ){ /* with background rectangle */
const unsigned int x_max = wid;
const unsigned int y_max = hei;
unsigned int x, y, bitmapIter = 0;
const unsigned char fontColorR = 255;
const unsigned char fontColorG = 255;
const unsigned char fontColorB = 0;
const unsigned char backgroundColorR = 64;
const unsigned char backgroundColorG = 64;
const unsigned char backgroundColorB = 64;
for( y = 0; y < y_max; y++ ) {
for( x = 0; x < x_max; x++ ) {
const unsigned int iter = ( y * x_max + x ) * 4;
if( x == 0 || y == 0 || x == ( x_max - 1 ) || y == ( y_max - 1 ) ) {
buf[iter] = backgroundColorB;
buf[iter + 1] = backgroundColorG;
buf[iter + 2] = backgroundColorR;
buf[iter + 3] = 150; /* half trans border */
continue;
}
if( bitmap.buffer[bitmapIter] == 0 ) {
/* Render background color. */
buf[iter] = backgroundColorB;
buf[iter + 1] = backgroundColorG;
buf[iter + 2] = backgroundColorR;
buf[iter + 3] = 255;
}
else {
/* Calculate alpha (opacity). */
const float opacity = bitmap.buffer[bitmapIter] / 255.f;
buf[iter] = fontColorB * opacity + ( 1 - opacity ) * backgroundColorB;
buf[iter + 1] = fontColorG * opacity + ( 1 - opacity ) * backgroundColorG;
buf[iter + 2] = fontColorR * opacity + ( 1 - opacity ) * backgroundColorR;
buf[iter + 3] = 255;
}
++bitmapIter;
}
}
}
#elif 0
if( 1 ){ /* normal with shadow */
const unsigned int x_max = wid;
const unsigned int y_max = hei;
unsigned int x, y, bitmapIter = 0;
// unsigned char fontColorR = 255;
// unsigned char fontColorG = 255;
// unsigned char fontColorB = 0;
unsigned char fontColorR = colour[0];
unsigned char fontColorG = colour[1];
unsigned char fontColorB = colour[2];
unsigned char backgroundColorR = 0;
unsigned char backgroundColorG = 0;
unsigned char backgroundColorB = 0;
for( y = 0; y < y_max; y++ ) {
for( x = 0; x < x_max; x++ ) {
const unsigned int iter = ( y * x_max + x ) * 4;
if( x == 0 || y == 0 || x == 1 || y == 1 ) {
buf[iter] = fontColorB;
buf[iter + 1] = fontColorG;
buf[iter + 2] = fontColorR;
buf[iter + 3] = 0;
continue;
}
if( bitmap.buffer[bitmapIter] == 0 ){
buf[iter] = fontColorB;
buf[iter + 1] = fontColorG;
buf[iter + 2] = fontColorR;
buf[iter + 3] = 0;
}
else{
buf[iter] = backgroundColorB;
buf[iter + 1] = backgroundColorG;
buf[iter + 2] = backgroundColorR;
buf[iter + 3] = bitmap.buffer[bitmapIter];
}
++bitmapIter;
}
}
bitmapIter = 0;
for( y = 0; y < y_max; y++ ) {
for( x = 0; x < x_max; x++ ) {
const unsigned int iter = ( y * x_max + x ) * 4;
if( x == 0 || y == 0 || x == ( x_max - 1 ) || y == ( y_max - 1 ) ) {
continue;
}
if( bitmap.buffer[bitmapIter] != 0 ) {
if( buf[iter + 3] == 0 ){
buf[iter] = fontColorB;
buf[iter + 1] = fontColorG;
buf[iter + 2] = fontColorR;
buf[iter + 3] = bitmap.buffer[bitmapIter];
}
else{
/* Calculate alpha (opacity). */
const float opacityFont = bitmap.buffer[bitmapIter] / 255.f;
const float opacityBack = buf[iter + 3] / 255.f;
buf[iter] = fontColorB * opacityFont + ( 1 - opacityFont ) * backgroundColorB;
buf[iter + 1] = fontColorG * opacityFont + ( 1 - opacityFont ) * backgroundColorG;
buf[iter + 2] = fontColorR * opacityFont + ( 1 - opacityFont ) * backgroundColorR;
buf[iter + 3] = ( opacityFont + ( 1 - opacityFont ) * opacityBack ) * 255.f;
}
}
++bitmapIter;
}
}
}
else{ /* normal */
const unsigned int x_max = wid;
const unsigned int y_max = hei;
unsigned int x, y, bitmapIter = 0;
// unsigned char fontColorR = 0;
// unsigned char fontColorG = 255;
// unsigned char fontColorB = 0;
unsigned char fontColorR = colour[0];
unsigned char fontColorG = colour[1];
unsigned char fontColorB = colour[2];
for( y = 0; y < y_max; y++ ) {
for( x = 0; x < x_max; x++ ) {
const unsigned int iter = ( y * x_max + x ) * 4;
if( x == 0 || y == 0 || x == ( x_max - 1 ) || y == ( y_max - 1 ) ) {
buf[iter] = fontColorB;
buf[iter + 1] = fontColorG;
buf[iter + 2] = fontColorR;
buf[iter + 3] = 0;
continue;
}
buf[iter] = fontColorB;
buf[iter + 1] = fontColorG;
buf[iter + 2] = fontColorR;
buf[iter + 3] = bitmap.buffer[bitmapIter];
++bitmapIter;
}
}
}
#endif // 0
//Now we just setup some texture parameters.
gl().glBindTexture( GL_TEXTURE_2D, tex );
gl().glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl().glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
gl().glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
gl().glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
// gl().glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// gl().glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
// gl().glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
gl().glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
gl().glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
// gl().glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
//Here we actually create the texture itself
gl().glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA8, wid * 3, hei,
0, GL_BGRA, GL_UNSIGNED_BYTE, 0 );
/* normal with shadow */
gray_to_texture( wid, hei, boo, buf, colour[0], colour[1], colour[2] );
gl().glTexSubImage2D( GL_TEXTURE_2D, 0, 0, 0, wid, hei, GL_BGRA, GL_UNSIGNED_BYTE, buf );
memset( buf, 0x00, 4 * hei * wid );
/* yellow selected with shadow */
gray_to_texture( wid, hei, boo, buf, 255, 255, 0 );
gl().glTexSubImage2D( GL_TEXTURE_2D, 0, wid, 0, wid, hei, GL_BGRA, GL_UNSIGNED_BYTE, buf );
memset( buf, 0x00, 4 * hei * wid );
/* orange childSelected with shadow */
gray_to_texture( wid, hei, boo, buf, 255, 128, 0 );
gl().glTexSubImage2D( GL_TEXTURE_2D, 0, wid * 2, 0, wid, hei, GL_BGRA, GL_UNSIGNED_BYTE, buf );
gl().glBindTexture( GL_TEXTURE_2D, 0 );
free( buf );
free( boo );
out_wid = wid;
out_hei = hei;
}
}
int getPixelAscent() const {
return m_pixelAscent;
}
int getPixelDescent() const {
return m_pixelDescent;
}
int getPixelHeight() const {
return m_pixelHeight;
}
};
#ifdef _WIN32
#include <windows.h>
#endif
#include "debugging/debugging.h"
// LordHavoc: this is code for direct Xlib bitmap character fetching, as an
// alternative to requiring gtkglarea, it was created due to a lack of this
// package on SuSE 9.x but this package is now commonly shipping in Linux
// distributions so this code may be unnecessary, feel free however to enable
// it when building packages for distros that do not ship with that package,
// or if you just prefer less dependencies...
#if 0
#include <X11/Xlib.h>
#include <gdk/gdkx.h>
#include <GL/glx.h>
GLFont *glfont_create( const char* font_string ){
GLuint font_list_base;
XFontStruct *fontInfo;
Display *dpy = GDK_DISPLAY();
unsigned int i, first, last, firstrow, lastrow;
int maxchars;
int firstbitmap;
fontInfo = XLoadQueryFont( dpy, "-*-fixed-*-*-*-*-8-*-*-*-*-*-*-*" );
if ( fontInfo == NULL ) {
// try to load other fonts
fontInfo = XLoadQueryFont( dpy, "-*-fixed-*-*-*-*-*-*-*-*-*-*-*-*" );
// any font will do !
if ( fontInfo == NULL ) {
fontInfo = XLoadQueryFont( dpy, "-*-*-*-*-*-*-*-*-*-*-*-*-*-*" );
}
if ( fontInfo == NULL ) {
ERROR_MESSAGE( "couldn't create font" );
}
}
first = (int)fontInfo->min_char_or_byte2;
last = (int)fontInfo->max_char_or_byte2;
firstrow = (int)fontInfo->min_byte1;
lastrow = (int)fontInfo->max_byte1;
/*
* How many chars in the charset
*/
maxchars = 256 * lastrow + last;
font_list_base = gl().glGenLists( maxchars + 1 );
if ( font_list_base == 0 ) {
ERROR_MESSAGE( "couldn't create font" );
}
/*
* Get offset to first char in the charset
*/
firstbitmap = 256 * firstrow + first;
/*
* for each row of chars, call glXUseXFont to build the bitmaps.
*/
for ( i = firstrow; i <= lastrow; i++ )
{
glXUseXFont( fontInfo->fid, firstbitmap, last - first + 1, font_list_base + firstbitmap );
firstbitmap += 256;
}
/* *height = fontInfo->ascent + fontInfo->descent;
*width = fontInfo->max_bounds.width; */
return new GLFontCallList( font_list_base, fontInfo->ascent, fontInfo->descent, fontInfo->ascent + fontInfo->descent );
}
#elif 0
#include <gtk/gtkglwidget.h>
GLFont *glfont_create( const char* font_string ){
GLuint font_list_base = gl().glGenLists( 256 );
gint font_height = 0, font_ascent = 0, font_descent = 0;
PangoFontDescription* font_desc = pango_font_description_from_string( font_string );
PangoFont* font = gdk_gl_font_use_pango_font( font_desc, 0, 256, font_list_base );
if ( font == 0 ) {
pango_font_description_free( font_desc );
font_desc = pango_font_description_from_string( "fixed 8" );
font = gdk_gl_font_use_pango_font( font_desc, 0, 256, font_list_base );
}
if ( font == 0 ) {
pango_font_description_free( font_desc );
font_desc = pango_font_description_from_string( "courier new 8" );
font = gdk_gl_font_use_pango_font( font_desc, 0, 256, font_list_base );
}
if ( font != 0 ) {
PangoFontMetrics* font_metrics = pango_font_get_metrics( font, 0 );
font_ascent = pango_font_metrics_get_ascent( font_metrics );
font_descent = pango_font_metrics_get_descent( font_metrics );
font_height = font_ascent + font_descent;
font_ascent = PANGO_PIXELS( font_ascent );
font_descent = PANGO_PIXELS( font_descent );
font_height = PANGO_PIXELS( font_height );
pango_font_metrics_unref( font_metrics );
}
pango_font_description_free( font_desc );
// fix for pango/gtkglext metrix bug
if ( font_height > 256 ) {
font_height = 16;
}
return new GLFontCallList( font_list_base, font_ascent, font_descent, font_height );
}
#elif 0
// new font code ripped from ZeroRadiant
#include <pango/pangoft2.h>
#include <pango/pango-features.h> //has PANGO_VERSION_CHECK
#include <pango/pango-utils.h>
class GLFontInternal : public GLFont
{
const char *font_string;
int font_height;
int font_ascent;
int font_descent;
int y_offset_bitmap_render_pango_units;
PangoContext *ft2_context;
PangoFontMap *fontmap;
public:
GLFontInternal( const char *_font_string ) : font_string( _font_string ){
PangoFontDescription *font_desc;
PangoLayout *layout;
PangoRectangle log_rect;
int font_ascent_pango_units;
int font_descent_pango_units;
#if !PANGO_VERSION_CHECK( 1,22,0 )
ft2_context = pango_ft2_get_context( 72, 72 );
#else
fontmap = pango_ft2_font_map_new();
pango_ft2_font_map_set_resolution( PANGO_FT2_FONT_MAP( fontmap ), 72, 72 );
ft2_context = pango_font_map_create_context( fontmap );
#endif
font_desc = pango_font_description_from_string( font_string );
//pango_font_description_set_size(font_desc, 10 * PANGO_SCALE);
pango_context_set_font_description( ft2_context, font_desc );
pango_font_description_free( font_desc );
// TODO fallback to fixed 8, courier new 8
layout = pango_layout_new( ft2_context );
#ifdef FONT_SIZE_WORKAROUND
pango_layout_set_width( layout, -1 ); // -1 no wrapping. All text on one line.
pango_layout_set_text( layout, "The quick brown fox jumped over the lazy sleeping dog's back then sat on a tack.", -1 ); // -1 null-terminated string.
#endif
#if !PANGO_VERSION_CHECK( 1,22,0 )
PangoLayoutIter *iter;
iter = pango_layout_get_iter( layout );
font_ascent_pango_units = pango_layout_iter_get_baseline( iter );
pango_layout_iter_free( iter );
#else
font_ascent_pango_units = pango_layout_get_baseline( layout );
#endif
pango_layout_get_extents( layout, NULL, &log_rect );
g_object_unref( G_OBJECT( layout ) );
font_descent_pango_units = log_rect.height - font_ascent_pango_units;
font_ascent = PANGO_PIXELS_CEIL( font_ascent_pango_units );
font_descent = PANGO_PIXELS_CEIL( font_descent_pango_units );
font_height = font_ascent + font_descent;
y_offset_bitmap_render_pango_units = ( font_ascent * PANGO_SCALE ) - font_ascent_pango_units;
}
virtual ~GLFontInternal(){
g_object_unref( G_OBJECT( ft2_context ) );
g_object_unref( G_OBJECT( fontmap ) );
}
// Renders the input text at the current location with the current color.
// The X position of the current location is used to place the left edge of the text image,
// where the text image bounds are defined as the logical extents of the line of text.
// The Y position of the current location is used to place the bottom of the text image.
// You should offset the Y position by the amount returned by gtk_glwidget_font_descent()
// if you want to place the baseline of the text image at the current Y position.
// Note: A problem with this function is that if the lower left corner of the text falls
// just a hair outside of the viewport (meaning the current raster position is invalid),
// then no text will be rendered. The solution to this is a very hacky one. You can search
// Google for "glDrawPixels clipping".
virtual void printString( const char *s ){
// The idea for this code initially came from the font-pangoft2.c example that comes with GtkGLExt.
PangoLayout *layout;
PangoRectangle log_rect;
FT_Bitmap bitmap;
unsigned char *begin_bitmap_buffer;
GLfloat color[4];
GLint previous_unpack_alignment;
GLboolean previous_blend_enabled;
GLint previous_blend_func_src;
GLint previous_blend_func_dst;
GLfloat previous_red_bias;
GLfloat previous_green_bias;
GLfloat previous_blue_bias;
GLfloat previous_alpha_scale;
layout = pango_layout_new( ft2_context );
pango_layout_set_width( layout, -1 ); // -1 no wrapping. All text on one line.
pango_layout_set_text( layout, s, -1 ); // -1 null-terminated string.
pango_layout_get_extents( layout, NULL, &log_rect );
if ( log_rect.width > 0 && log_rect.height > 0 ) {
bitmap.rows = font_ascent + font_descent;
bitmap.width = PANGO_PIXELS_CEIL( log_rect.width );
bitmap.pitch = -bitmap.width; // Rendering it "upside down" for OpenGL.
begin_bitmap_buffer = (unsigned char *) g_malloc( bitmap.rows * bitmap.width );
memset( begin_bitmap_buffer, 0, bitmap.rows * bitmap.width );
bitmap.buffer = begin_bitmap_buffer + ( bitmap.rows - 1 ) * bitmap.width; // See pitch above.
bitmap.num_grays = 0xff;
bitmap.pixel_mode = FT_PIXEL_MODE_GRAY;
pango_ft2_render_layout_subpixel( &bitmap, layout, -log_rect.x,
y_offset_bitmap_render_pango_units );
gl().glGetFloatv( GL_CURRENT_COLOR, color );
// Save state. I didn't see any OpenGL push/pop operations for these.
// Question: Is saving/restoring this state necessary? Being safe.
gl().glGetIntegerv( GL_UNPACK_ALIGNMENT, &previous_unpack_alignment );
previous_blend_enabled = gl().glIsEnabled( GL_BLEND );
gl().glGetIntegerv( GL_BLEND_SRC, &previous_blend_func_src );
gl().glGetIntegerv( GL_BLEND_DST, &previous_blend_func_dst );
gl().glGetFloatv( GL_RED_BIAS, &previous_red_bias );
gl().glGetFloatv( GL_GREEN_BIAS, &previous_green_bias );
gl().glGetFloatv( GL_BLUE_BIAS, &previous_blue_bias );
gl().glGetFloatv( GL_ALPHA_SCALE, &previous_alpha_scale );
gl().glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
gl().glEnable( GL_BLEND );
gl().glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
gl().glPixelTransferf( GL_RED_BIAS, color[0] );
gl().glPixelTransferf( GL_GREEN_BIAS, color[1] );
gl().glPixelTransferf( GL_BLUE_BIAS, color[2] );
gl().glPixelTransferf( GL_ALPHA_SCALE, color[3] );
gl().glDrawPixels( bitmap.width, bitmap.rows,
GL_ALPHA, GL_UNSIGNED_BYTE, begin_bitmap_buffer );
g_free( begin_bitmap_buffer );
// Restore state in reverse order of how we set it.
gl().glPixelTransferf( GL_ALPHA_SCALE, previous_alpha_scale );
gl().glPixelTransferf( GL_BLUE_BIAS, previous_blue_bias );
gl().glPixelTransferf( GL_GREEN_BIAS, previous_green_bias );
gl().glPixelTransferf( GL_RED_BIAS, previous_red_bias );
gl().glBlendFunc( previous_blend_func_src, previous_blend_func_dst );
if ( !previous_blend_enabled ) {
gl().glDisable( GL_BLEND );
}
gl().glPixelStorei( GL_UNPACK_ALIGNMENT, previous_unpack_alignment );
}
g_object_unref( G_OBJECT( layout ) );
}
virtual int getPixelAscent() const {
return font_ascent;
}
virtual int getPixelDescent() const {
return font_descent;
}
virtual int getPixelHeight() const {
return font_height;
}
};
GLFont *glfont_create( const char* font_string ){
return new GLFontInternal( font_string );
}
#elif 1
GLFont *glfont_create( const char* family, int fontSize, const char* appPath ){
GLuint font_list_base = gl().glGenLists( 128 );
QFont font;
font.setPointSize( fontSize );
{
const int id = QFontDatabase::addApplicationFont( QString( appPath ) + "bitmaps/MyriadPro-Regular.ttf" );
if( id >= 0 && string_equal( family, "Myriad Pro" ) )
font.setFamily( QFontDatabase::applicationFontFamilies( id ).at( 0 ) );
else if( !string_empty( family ) )
font.setFamily( family );
}
globalOutputStream() << "Using OpenGL font " << makeQuoted( font.toString().toLatin1().constData() ) << '\n';
QFontMetrics metrics( font );
/* render displaylists */
GLuint atlas;
{
const int wid = metrics.maxWidth(); // <-slow func
const int hei = metrics.height();
const int awidth = wid * 12;
const int aheight = hei * 12;
QImage image( awidth, aheight, QImage::Format::Format_Alpha8 );
image.fill( 0 );
QPainter painter;
painter.begin( &image );
painter.setFont( font );
for( unsigned char c = 0; c < 128; ++c ){
const QRect rect = painter.boundingRect( QRect(), Qt::AlignmentFlag::AlignCenter, QString( c ) );
painter.drawText( c % 12 * wid, ( c / 12 + 1 ) * hei - metrics.descent(), QString( c ) );
if ( rect.width() > 0 && rect.height() > 0 ) {
gl().glNewList( font_list_base + c, GL_COMPILE );
gl().glBegin( GL_QUADS );
const float x0 = 0;
const float x1 = rect.width();
const float y0 = 0;
const float y1 = rect.height();
const float tx0 = ( c % 12 ) / 12.f;
const float tx1 = ( c % 12 + static_cast<float>( rect.width() ) / wid ) / 12.f;
const float ty0 = ( c / 12 ) / 12.f;
const float ty1 = ( c / 12 + static_cast<float>( rect.height() ) / hei ) / 12.f;
gl().glTexCoord2f( tx0, ty1 );
gl().glVertex2f( x0, y0 );
gl().glTexCoord2f( tx0, ty0 );
gl().glVertex2f( x0, y1 );
gl().glTexCoord2f( tx1, ty0 );
gl().glVertex2f( x1, y1 );
gl().glTexCoord2f( tx1, ty1 );
gl().glVertex2f( x1, y0 );
gl().glEnd();
gl().glTranslatef( metrics.horizontalAdvance( c ), 0, 0 );
gl().glEndList();
}
}
painter.end();
// image.save( "radAtlas.png" );
GLint alignment;
gl().glGetIntegerv( GL_UNPACK_ALIGNMENT, &alignment );
gl().glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
gl().glGenTextures( 1, &atlas );
//Now we just setup some texture parameters.
gl().glBindTexture( GL_TEXTURE_2D, atlas );
gl().glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
gl().glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
gl().glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
gl().glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
gl().glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0 );
gl().glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0 );
//Here we actually create the texture itself
GLubyte* data = (GLubyte*)calloc( awidth * aheight * 2, sizeof( GLubyte ) );
for( int w = 0; w < awidth; ++w )
for( int h = 0; h < aheight; ++h ){
data[( h * awidth + w ) * 2] = 255;
data[( h * awidth + w ) * 2 + 1] = qAlpha( image.pixel( w, h ) );
}
gl().glTexImage2D( GL_TEXTURE_2D, 0, GL_LUMINANCE_ALPHA, awidth, aheight,
0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, data );
free( data );
gl().glPixelStorei( GL_UNPACK_ALIGNMENT, alignment );
GlobalOpenGL_debugAssertNoErrors();
}
return new GLFontCallList( font_list_base, atlas, font, metrics );
}
#endif
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