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added _mesa_image_image_stride()

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This commit is contained in:
Brian Paul 2002-03-13 04:34:32 +00:00
parent 9a888bdc2a
commit d488af5b34
2 changed files with 51 additions and 6 deletions
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46
src/mesa/main/image.c
View file

@ -1,10 +1,10 @@
/* $Id: image.c,v 1.63 2001/07/14 17:53:04 brianp Exp $ */
/* $Id: image.c,v 1.64 2002/03/13 04:34:32 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
* Version: 4.1
*
* Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
* Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@ -544,6 +544,46 @@ _mesa_image_row_stride( const struct gl_pixelstore_attrib *packing,
/*
* Compute the stride between images in a 3D texture (in bytes) for the given
* pixel packing parameters and image width, format and type.
*/
GLint
_mesa_image_image_stride( const struct gl_pixelstore_attrib *packing,
GLint width, GLint height,
GLenum format, GLenum type )
{
ASSERT(packing);
ASSERT(type != GL_BITMAP);
{
const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
GLint bytesPerRow, bytesPerImage, remainder;
if (bytesPerPixel <= 0)
return -1; /* error */
if (packing->RowLength == 0) {
bytesPerRow = bytesPerPixel * width;
}
else {
bytesPerRow = bytesPerPixel * packing->RowLength;
}
remainder = bytesPerRow % packing->Alignment;
if (remainder > 0)
bytesPerRow += (packing->Alignment - remainder);
if (packing->ImageHeight == 0)
bytesPerImage = bytesPerRow * height;
else
bytesPerImage = bytesPerRow * packing->ImageHeight;
return bytesPerImage;
}
}
/*
* Unpack a 32x32 pixel polygon stipple from user memory using the
* current pixel unpack settings.

11
src/mesa/main/image.h
View file

@ -1,10 +1,10 @@
/* $Id: image.h,v 1.17 2001/03/07 05:06:12 brianp Exp $ */
/* $Id: image.h,v 1.18 2002/03/13 04:34:32 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
* Version: 4.1
*
* Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
* Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@ -69,6 +69,11 @@ _mesa_image_row_stride( const struct gl_pixelstore_attrib *packing,
GLint width, GLenum format, GLenum type );
extern GLint
_mesa_image_image_stride( const struct gl_pixelstore_attrib *packing,
GLint width, GLint height,
GLenum format, GLenum type );
extern void
_mesa_unpack_polygon_stipple( const GLubyte *pattern, GLuint dest[32],
const struct gl_pixelstore_attrib *unpacking );