Re: Trying to figure out how to render a single character represented by a FT_Bitmap in X
> Thanks a lot for your very informative comments. They were very
> helpful. I am trying to get a working program based on your comments.
> I will email it to the list once I have a working version.
For the record, a sample program to write out the Char 'I' to X:
#include
#include
#include
#include
#include
#include FT_FREETYPE_H
#define WIDTH 32
#define HEIGHT 40
/* origin is the upper left corner */
unsigned char image[HEIGHT][WIDTH];
unsigned char pixmap[(WIDTH/8)*HEIGHT];
/* Replace this function with something useful. */
void draw_bitmap( FT_Bitmap* bitmap, FT_Int pitch, FT_Int left, FT_Int top) {
int h, w, bitpos, bytepos, row, bitmapw;
char byte ;
int twidth = left + bitmap->width;
/* blank out above the top to the max height */
for (h = 0; h < (HEIGHT - top); h++) {
for (w = 0; w < twidth; w++) {
image[h][w] = 0;
}
}
for (h = (HEIGHT - top); h < HEIGHT; h++) {
row = pitch * (h - (HEIGHT - top));
for (w = 0; w < twidth; w++) {
if (w < left) {
image[h][w] = 0;
} else {
bitmapw = w-left;
bytepos = bitmapw / 8;
/* as bits are laid out from high bit to the low bit */
bitpos = 7 - (bitmapw % 8);
byte= (char) (bitmap->buffer[row+bytepos]);
/* If you want the k-th bit of n, then do */
/*(n & ( 1 << k )) >> k */
image[h][w] = (byte & ( 1 << bitpos )) >> bitpos;
/* if (12 == row) fprintf(stdout,
"w: %02x, bitmapw: %02x, byte: %02x, bitpos: %02x, image: %01x ",
w,bitmapw,byte,bitpos,image[w][h]); */
}
}
}
}
void show_image( int width ) {
int h, w;
for ( h = 0; h < HEIGHT; h++ ) {
fprintf(stdout,"row: %02d",h);
for ( w = 0; w < width; w++ )
putchar( image[h][w] == 0 ? ' ' : '.' );
putchar( '\n' );
}
}
void to_xpixmap( int width ) {
int h, w;
for ( h = 0; h < HEIGHT; h++ ) {
for ( w = 0; w < (width/8); w++ ) {
pixmap[(h*(width/8))+w] =
(image[h][((w*8)+7)]<<7) |
(image[h][((w*8)+6)]<<6) |
(image[h][((w*8)+5)]<<5) |
(image[h][((w*8)+4)]<<4) |
(image[h][((w*8)+3)]<<3) |
(image[h][((w*8)+2)]<<2) |
(image[h][((w*8)+1)]<<1) |
(image[h][((w*8)+0)]<<0) ;
/* fprintf(stdout,"w: %02d, h: %02d -- %02x\n", */
/*w,h,pixmap[(h*(width/8))+w]); */
}
}
}
int main( int argc, char** argv ) {
FT_Librarylibrary;
FT_Face face;
FT_GlyphSlot slot;
FT_Matrix matrix; /* transformation matrix */
FT_Vector pen;/* untransformed origin */
FT_Error error;
int pitch;
unsigned char *bitmap;
int h,wi;
int twidth = 0;
Display *d;
Window w;
XEvent e;
int s,i;
Pixmap p;
unsigned int bwidth, bheight;
int hotspot_x, hotspot_y;
/* int target_height; */
int n, num_chars;
char *msg = "Hello, World!";
error = FT_Init_FreeType( &library ); /* initialize library */
/* error handling omitted */
error = FT_New_Face(
library,
"/usr/share/fonts/liberation-fonts/LiberationMono-Regular.ttf",
0, &face );/* create face object */
/* error handling omitted */
FT_Set_Pixel_Sizes(face, 0, 48);
error = FT_Load_Char( face, 'I', FT_LOAD_RENDER | FT_LOAD_MONOCHROME );
if (0 != error) {
fprintf(stderr,"could not load FT_Load_Char\n");
fflush(stderr);
exit(1);
}
slot = face->glyph;
fprintf(stdout,"returned bitmap characterstics:\n \
bitmap_left: %d,\n\
bitmap_top: %d,\n\
rows: %d, \n\
width: %d, \n\
pitch: %d, \n\
num_grays: %d, \n\
pixel_mode: %d\n",
slot->bitmap_left,
slot->bitmap_top,
slot->bitmap.rows,
slot->bitmap.width,
slot->bitmap.pitch,
slot->bitmap.num_grays,
slot->bitmap.pixel_mode);
/* if ( pitch < 0 ) pitch = -pitch; */
/* bitmap = (unsigned char *) malloc(slot->bitmap.rows * pitch); */
/* memcpy(bitmap, slot->bitmap.buffer, pitch*slot->bitmap.rows ); */
/* fprintf(stdout,"pitch: %d, rows: %d, pitch * slot->bitmap.rows: %d\n", */
/*pitch, */
/*slot->bitmap.rows, */
/*pitch * slot->bitmap.rows); */
for(i = 0; i < slot->bitmap.pitch * slot->bitmap.rows; i++) {
if (0 == i % slot->bitmap.pitch) fprintf(stdout,"\n");
fprintf(stdout,"%d: 0x%02X ", i,slot->bitmap.buffer[i]);
fflush(stdout);
}
fprintf(stdout,"\n");
/* now, draw to our target surface (convert position) */
draw_bitmap( &slot->bitmap,
slot->bitmap.pitch,
Re: Trying to figure out how to render a single character represented by a FT_Bitmap in X
Hello Glynn, >> I am trying to figure how to print one character from a FT_Bitmap >> (freetype2 bitmap). >> >> But, I am not able to get the character to display properly. I seem to >> be missing something simple. >> >> I seem to be missing something simple while creating the X pixmap >> based on the FT_Bitmap.buffer. >> >> Any thoughts, please? > >> error = FT_Load_Char( face, 'z', FT_LOAD_RENDER ); > > This calls FT_Render_Glyph with a mode of FT_RENDER_MODE_NORMAL, which > generates an 8-bpp antialiased image, whereas ... > >> p = XCreateBitmapFromData(d, w, >>slot->bitmap.buffer, slot->bitmap.width , >> slot->bitmap.rows); > > ... this expects a 1-bpp monochrome bitmap. Pass FT_LOAD_MONOCHROME to > FT_Load_Char to get a monochrome bitmap instead of a grey-scale image. > > Also: you're ignoring the bitmap's pitch (slot->bitmap.pitch). The > bitmap created by FT_Load_Char isn't guaranteed to be "packed", but > XCreateBitmapFromData() requires it to be. Also, the data in > slot->bitmap.buffer can be top-to-bottom (positive pitch) or > bottom-to-top (negative pitch), but XCreateBitmapFromData() only > supports the former. > > You can get more flexibility by creating an XImage from the data then > drawing the XImage into a Pixmap. Or you could just convert the data > manually. Thanks a lot for your very informative comments. They were very helpful. I am trying to get a working program based on your comments. I will email it to the list once I have a working version. >> >> XWriteBitmapFile(d,"test1.bmp",p,slot->bitmap.width,slot->bitmap.rows,0,0); > > The ".bmp" extension is normally used for Microsoft Windows "bitmap" > (BMP) files. XWriteBitmapFile() generates an "X bitmap" (XBM) file, > which normally has either a ".xbm" extension or no extension (see the > files in /usr/include/X11/bitmaps). Oh, I did not know about ".xbm". Thanks a lot for clarifying that. Thanks again, Joe ___ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: arch...@mail-archive.com
Re: Trying to figure out how to render a single character represented by a FT_Bitmap in X
> Your "bitmap" is likely 8 bits per pixel, not 1. Considering you haven't > told FT how you are going to render it, it may not even be a single > channel... > -Chris Thanks Chris. ___ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: arch...@mail-archive.com
Re: Trying to figure out how to render a single character represented by a FT_Bitmap in X
On Fri, Feb 15, 2013 at 10:17:55PM -0500, joe M wrote: > Hello, > > I am trying to figure how to print one character from a FT_Bitmap > (freetype2 bitmap). > > But, I am not able to get the character to display properly. I seem to > be missing something simple. Your "bitmap" is likely 8 bits per pixel, not 1. Considering you haven't told FT how you are going to render it, it may not even be a single channel... -Chris -- Chris Wilson, Intel Open Source Technology Centre ___ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: arch...@mail-archive.com
Re: Trying to figure out how to render a single character represented by a FT_Bitmap in X
joe M wrote: > I am trying to figure how to print one character from a FT_Bitmap > (freetype2 bitmap). > > But, I am not able to get the character to display properly. I seem to > be missing something simple. > > I seem to be missing something simple while creating the X pixmap > based on the FT_Bitmap.buffer. > > Any thoughts, please? > error = FT_Load_Char( face, 'z', FT_LOAD_RENDER ); This calls FT_Render_Glyph with a mode of FT_RENDER_MODE_NORMAL, which generates an 8-bpp antialiased image, whereas ... > p = XCreateBitmapFromData(d, w, >slot->bitmap.buffer, slot->bitmap.width , > slot->bitmap.rows); ... this expects a 1-bpp monochrome bitmap. Pass FT_LOAD_MONOCHROME to FT_Load_Char to get a monochrome bitmap instead of a grey-scale image. Also: you're ignoring the bitmap's pitch (slot->bitmap.pitch). The bitmap created by FT_Load_Char isn't guaranteed to be "packed", but XCreateBitmapFromData() requires it to be. Also, the data in slot->bitmap.buffer can be top-to-bottom (positive pitch) or bottom-to-top (negative pitch), but XCreateBitmapFromData() only supports the former. You can get more flexibility by creating an XImage from the data then drawing the XImage into a Pixmap. Or you could just convert the data manually. > > XWriteBitmapFile(d,"test1.bmp",p,slot->bitmap.width,slot->bitmap.rows,0,0); The ".bmp" extension is normally used for Microsoft Windows "bitmap" (BMP) files. XWriteBitmapFile() generates an "X bitmap" (XBM) file, which normally has either a ".xbm" extension or no extension (see the files in /usr/include/X11/bitmaps). -- Glynn Clements ___ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: arch...@mail-archive.com
Trying to figure out how to render a single character represented by a FT_Bitmap in X
Hello,
I am trying to figure how to print one character from a FT_Bitmap
(freetype2 bitmap).
But, I am not able to get the character to display properly. I seem to
be missing something simple.
I seem to be missing something simple while creating the X pixmap
based on the FT_Bitmap.buffer.
Any thoughts, please?
Thanks
Joe
#include
#include
#include
#include
#include
#include FT_FREETYPE_H
int
main( int argc,
char** argv )
{
FT_Librarylibrary;
FT_Face face;
FT_GlyphSlot slot;
FT_Matrix matrix; /* transformation matrix */
FT_Vector pen;/* untransformed origin */
FT_Error error;
Display *d;
Window w;
XEvent e;
int s,i;
Pixmap p, pixmap;
unsigned int bwidth, bheight;
int hotspot_x, hotspot_y;
error = FT_Init_FreeType( &library ); /* initialize library */
/* error handling omitted */
error = FT_New_Face( library,
"/usr/share/fonts/anonymous-pro/Anonymous Pro I.ttf", 0, &face );/*
create face object */
/* error handling omitted */
error = FT_Set_Pixel_Sizes( face, 0, 24 );
slot = face->glyph;
error = FT_Load_Char( face, 'z', FT_LOAD_RENDER );
d = XOpenDisplay(NULL);
if (d == NULL) {
fprintf(stderr, "Cannot open display\n");
exit(1);
}
s = DefaultScreen(d);
w = XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 100, 100, 1,
BlackPixel(d, s), WhitePixel(d, s));
XSelectInput(d, w, ExposureMask | KeyPressMask);
XMapWindow(d, w);
while (1) {
XNextEvent(d, &e); if (e.type == Expose) {
p = XCreateBitmapFromData(d, w,
slot->bitmap.buffer, slot->bitmap.width ,
slot->bitmap.rows);
XWriteBitmapFile(d,"test1.bmp",p,slot->bitmap.width,slot->bitmap.rows,0,0);
XCopyPlane(d, p , w, DefaultGC(d,s),
0, 0,
slot->bitmap.width, slot->bitmap.rows,
40, 40,1);
XSync(d, False);
usleep(10);
}
if (e.type == KeyPress)
break;
}
XCloseDisplay(d);
FT_Done_Face( face );
FT_Done_FreeType( library );
return 0;
}
/* EOF */
___
xorg@lists.x.org: X.Org support
Archives: http://lists.freedesktop.org/archives/xorg
Info: http://lists.x.org/mailman/listinfo/xorg
Your subscription address: arch...@mail-archive.com
