Glbitmap - HP b2600 Reference Manual

B

glBitMap

glBitMap
glBitmap: draw a bitmap.
C Specification
void glBitmap(
Parameters
width, height
xorig, yorig
xmove, ymove
bitmap
Description
A bitmap is a binary image. When drawn, the bitmap is positioned relative to the current
raster position, and frame buffer pixels corresponding to 1s in the bitmap are written
using the current raster color or index. Frame buffer pixels corresponding to 0s in the
bitmap are not modified.
glBitmap takes seven arguments. The first pair specifies the width and height of the
bitmap image. The second pair specifies the location of the bitmap origin relative to the
lower left corner of the bitmap image. The third pair of arguments specifies x and y
offsets to be added to the current raster position after the bitmap has been drawn. The
final argument is a pointer to the bitmap image itself.
The bitmap image is interpreted like image data for the glDrawPixels command, with
width and height corresponding to the width and height arguments of that command,
and with type set to GL_BITMAP and format set to GL_COLOR_INDEX.
Modes specified using glPixelStore affect the interpretation of bitmap image data; modes
specified using glPixelTransfer do not.
If the current raster position is invalid, glBitmap is ignored. Otherwise, the lower left
corner of the bitmap image is positioned at the window coordinates
x
w
y
w
30
GLsizei width,
GLsizei height,
GLfloat xorig,
GLfloat yorig,
GLfloat xmove,
GLfloat ymove,
const GLubyte *bitmap)
Specify the pixel width and height of the bitmap image.
Specify the location of the origin in the bitmap image. The origin is
measured from the lower left corner of the bitmap, with right and up
being the positive axes.
Specify the x and y offsets to be added to the current raster position
after the bitmap is drawn.
Specifies the address of the bitmap image.
= x - x
r o
= y - y
r o
Chapter 2