static GLvoid* read_color_image	(	GLcontext *	ctx,
		GLint	x,
		GLint	y,
		GLenum	type,
		GLsizei	width,
		GLsizei	height
	)		`[static]`

Read an RGBA image from the frame buffer. This is used by glCopyTex[Sub]Image[12]D().

Parameters:

x	window source x
y	window source y
width	image width
height	image height
type	datatype for returned GL_RGBA image

Returns:: pointer to image

Definition at line 67 of file s_texstore.c.

Referenced by _swrast_copy_teximage1d(), _swrast_copy_teximage2d(), _swrast_copy_texsubimage1d(), _swrast_copy_texsubimage2d(), and _swrast_copy_texsubimage3d().

{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);
   struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
   const GLint pixelSize = _mesa_bytes_per_pixel(GL_RGBA, type);
   const GLint stride = width * pixelSize;
   GLint row;
   GLubyte *image, *dst;

   image = (GLubyte *) _mesa_malloc(width * height * pixelSize);
   if (!image)
      return NULL;

   RENDER_START(swrast, ctx);

   dst = image;
   for (row = 0; row < height; row++) {
      _swrast_read_rgba_span(ctx, rb, width, x, y + row, type, dst);
      dst += stride;
   }

   RENDER_FINISH(swrast, ctx);

   return image;
}

ReactOS Development > Doxygen