bitmap.h File Reference

#include "types.h"

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Functions
struct gl_image *	gl_unpack_bitmap (GLcontext *ctx, GLsizei width, GLsizei height, const GLubyte *bitmap)
void	gl_render_bitmap (GLcontext *ctx, GLsizei width, GLsizei height, GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove, const struct gl_image *bitmap)
void	gl_Bitmap (GLcontext *ctx, GLsizei width, GLsizei height, GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove, const struct gl_image *bitmap)

Function Documentation

gl_Bitmap()

void gl_Bitmap	(	GLcontext *	ctx,
		GLsizei	width,
		GLsizei	height,
		GLfloat	xorig,
		GLfloat	yorig,
		GLfloat	xmove,
		GLfloat	ymove,
		const struct gl_image *	bitmap
	)

Definition at line 161 of file bitmap.c.

{
   if (width<0 || height<0) {
      gl_error( ctx, GL_INVALID_VALUE, "glBitmap" );
      return;
   }
   if (INSIDE_BEGIN_END(ctx)) {
      gl_error( ctx, GL_INVALID_OPERATION, "glBitmap" );
      return;
   }
   if (ctx->Current.RasterPosValid==GL_FALSE) {
      /* do nothing */
      return;
   }
 
   if (ctx->RenderMode==GL_RENDER) {
      GLboolean completed = GL_FALSE;
      if (ctx->Driver.Bitmap) {
         /* let device driver try to render the bitmap */
         completed = (*ctx->Driver.Bitmap)( ctx, width, height, xorig, yorig,
                                            xmove, ymove, bitmap );
      }
      if (!completed) {
         /* use generic function */
         gl_render_bitmap( ctx, width, height, xorig, yorig,
                           xmove, ymove, bitmap );
      }
   }
   else if (ctx->RenderMode==GL_FEEDBACK) {
      GLfloat color[4], texcoord[4], invq;
      color[0] = ctx->Current.ByteColor[0] * ctx->Visual->InvRedScale;
      color[1] = ctx->Current.ByteColor[1] * ctx->Visual->InvGreenScale;
      color[2] = ctx->Current.ByteColor[2] * ctx->Visual->InvBlueScale;
      color[3] = ctx->Current.ByteColor[3] * ctx->Visual->InvAlphaScale;
      invq = 1.0F / ctx->Current.TexCoord[3];
      texcoord[0] = ctx->Current.TexCoord[0] * invq;
      texcoord[1] = ctx->Current.TexCoord[1] * invq;
      texcoord[2] = ctx->Current.TexCoord[2] * invq;
      texcoord[3] = ctx->Current.TexCoord[3];
      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_BITMAP_TOKEN );
      /* TODO: Verify XYZW values are correct: */
      gl_feedback_vertex( ctx, ctx->Current.RasterPos[0] - xorig,
              ctx->Current.RasterPos[1] - yorig,
              ctx->Current.RasterPos[2],
              ctx->Current.RasterPos[3],
              color, ctx->Current.Index, texcoord );
   }
   else if (ctx->RenderMode==GL_SELECT) {
      /* Bitmaps don't generate selection hits.  See appendix B of 1.1 spec. */
   }
 
   /* update raster position */
   ctx->Current.RasterPos[0] += xmove;
   ctx->Current.RasterPos[1] += ymove;
}

Referenced by execute_list(), and init_exec_pointers().

gl_render_bitmap()

void gl_render_bitmap	(	GLcontext *	ctx,
		GLsizei	width,
		GLsizei	height,
		GLfloat	xorig,
		GLfloat	yorig,
		GLfloat	xmove,
		GLfloat	ymove,
		const struct gl_image *	bitmap
	)

Definition at line 90 of file bitmap.c.

{
   struct pixel_buffer *PB = ctx->PB;
   GLint bx, by;      /* bitmap position */
   GLint px, py, pz;  /* pixel position */
   GLubyte *ptr;
 
   assert(bitmap);
   assert(bitmap->Type == GL_BITMAP);
   assert(bitmap->Format == GL_COLOR_INDEX);
 
   if (ctx->NewState) {
      gl_update_state(ctx);
      PB_INIT( PB, GL_BITMAP );
   }
 
   if (ctx->Visual->RGBAflag) {
      GLint r, g, b, a;
      r = (GLint) (ctx->Current.RasterColor[0] * ctx->Visual->RedScale);
      g = (GLint) (ctx->Current.RasterColor[1] * ctx->Visual->GreenScale);
      b = (GLint) (ctx->Current.RasterColor[2] * ctx->Visual->BlueScale);
      a = (GLint) (ctx->Current.RasterColor[3] * ctx->Visual->AlphaScale);
      PB_SET_COLOR( ctx, PB, r, g, b, a );
   }
   else {
      PB_SET_INDEX( ctx, PB, ctx->Current.RasterIndex );
   }
 
   px = (GLint) ( (ctx->Current.RasterPos[0] - xorig) + 0.0F );
   py = (GLint) ( (ctx->Current.RasterPos[1] - yorig) + 0.0F );
   pz = (GLint) ( ctx->Current.RasterPos[2] * DEPTH_SCALE );
   ptr = (GLubyte *) bitmap->Data;
 
   for (by=0;by<height;by++) {
      GLubyte bitmask;
 
      /* do a row */
      bitmask = 128;
      for (bx=0;bx<width;bx++) {
         if (*ptr&bitmask) {
            PB_WRITE_PIXEL( PB, px+bx, py+by, pz );
         }
         bitmask = bitmask >> 1;
         if (bitmask==0) {
            ptr++;
            bitmask = 128;
         }
      }
 
      PB_CHECK_FLUSH( ctx, PB )
 
      /* get ready for next row */
      if (bitmask!=128)  ptr++;
   }
 
   gl_flush_pb(ctx);
}

Referenced by gl_Bitmap().

gl_unpack_bitmap()

struct gl_image * gl_unpack_bitmap	(	GLcontext *	ctx,
		GLsizei	width,
		GLsizei	height,
		const GLubyte *	bitmap
	)

Definition at line 76 of file bitmap.c.

{
   return gl_unpack_image( ctx, width, height,
                           GL_COLOR_INDEX, GL_BITMAP, bitmap );
}

Referenced by _mesa_Bitmap().