ufmGetTransformedBitmap(3w) ufmGetTransformedBitmap(3w)
ufmGetTransformedBitmap - get a transformed character bitmap
#include <ufm.h>
int ufmGetTransformedBitmap(unsigned int nTypefaceHandles,
unsigned int *typefaceHandles, int charCodeType,
unsigned int nCharCodes, void *charCodes, float transfMatrix[4],
unsigned int *nCharBitmaps, ufmBitmap **charBitmaps)
ufmGetTransformedBitmap gets transformed bitmaps for specified
characters. You can get a character bitmap only for those typefaces for
which bitmap or outline font files were found, that is, those typefaces
which have the bit ufmTypefaceBitmaps set to 1 in their data structures
of the type ufmTypeface.
nTypefaceHandles specifies the number of entries (typeface handles) in
the array typefaceHandles.
typefaceHandles specifies one or more handles for open typefaces. Use
the function ufmOpenTypeface to open a typeface, and get a handle for
that typeface.
If you specify more than one typeface handle, ufmGetTransformedBitmap
will look for bitmap fonts of the size pixelSize in specified typefaces.
If it does not find a requested bitmap font, it will create it. Then it
will look for the bitmap of a specified character in the bitmap font for
the first specified typeface. If it does not find it in that font, it
will look for that bitmap in the next bitmap font. It will stop looking
as soon as it finds the requested character bitmap. If it cannot find
that bitmap, it will return the bitmap for the default character. If
ufmGetTransformedBitmap cannot find the bitmap even for the default
character, it will return an error code.
charCodeType specifies a 1-byte character code (UFM_BYTE1), a Unicode
UCS-2 code (UFM_UCS2), a Unicode UCS-4 code (UFM_UCS4), a 2-byte
character code (UFM_BYTE2), or a 4-byte character code (UFM_BYTE4).
nCharCodes specifies the number of elements in the array charCodes. Set
nCharCodes to 0 if you want bitmaps for all characters in a specified
typeface. If you want bitmaps for only some characters, use the array
charCodes to specify the character codes of those characters.
transfMatrix specifies a 4-element transformation matrix that needs to be
applied to character bitmaps. This is a column-major matrix. Specify
matrix elements in the following sequence: 00, 10, 01 and 11.
ufmGetTransformedBitmap returns the number of character bitmaps it finds
(nCharBitmaps) and the address of the array in which it stores those
character bitmaps (ufmBitmap).
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ufmGetTransformedBitmap(3w) ufmGetTransformedBitmap(3w)
When you are finished with the array (ufmBitmap), you can free it by
calling ufmFreeBitmap with the argument values that were returned by
ufmGetTransformedBitmap.
A bitmap image provided by the function ufmGetTransformedBitmap should be
interpreted the same way as image data for the OpenGL function
glDrawPixels, with width and height corresponding to the width and height
arguments in that function, and with type set to GL_BITMAP and format set
to GL_COLOR_INDEX.
Each row of the bitmap is padded to a 4-byte boundary. If you want to
use the information provided by ufmGetTransformedBitmap to create OpenGL
font display lists, that is, to call OpenGL functions glNewList,
glBitmap, and glEndList, you should start by calling glPixelStore
function with the arguments GL_UNPACK_ALIGNMENT and 4. For example, if
you decide to use the function glPixelStorei, you should specify
glPixelStorei(GL_UNPACK_ALIGNMENT, 4).
ufmFree
.
If ufmGetTransformedBitmap is not able to allocate the memory it needs,
it will return the value UFM_OUT_OF_MEMORY. If the values of one or more
arguments are not valid, ufmGetTransformedBitmap will return the value
UFM_INVALID_VALUE. UFM_OUT_OF_MEMORY and UFM_INVALID_VALUE are defined
in the header file <ufm.h>.
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