st_sample.h File Reference

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Functions
void	st_sample_pixel_block (enum pipe_format format, const struct pipe_format_block *block, void *raw, float *rgba, unsigned rgba_stride, unsigned w, unsigned h)
	Randomly sample pixels.
void	st_sample_surface (struct pipe_surface *surface, float *rgba)

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Function Documentation

void st_sample_pixel_block	(	enum pipe_format	format,
		const struct pipe_format_block *	block,
		void *	raw,
		float *	rgba,
		unsigned	rgba_stride,
		unsigned	w,
		unsigned	h
	)

Randomly sample pixels.

Definition at line 503 of file st_sample.c.

References PIPE_FORMAT_DXT1_RGB, PIPE_FORMAT_DXT1_RGBA, PIPE_FORMAT_DXT3_RGBA, PIPE_FORMAT_DXT5_RGBA, st_sample_dxt_pixel_block(), and st_sample_generic_pixel_block().

{
   switch(format) {
   case PIPE_FORMAT_DXT1_RGB:
   case PIPE_FORMAT_DXT1_RGBA:
   case PIPE_FORMAT_DXT3_RGBA:
   case PIPE_FORMAT_DXT5_RGBA:
      st_sample_dxt_pixel_block(format, block, raw, rgba, rgba_stride, w, h);
      break;

   default:
      st_sample_generic_pixel_block(format, block, raw, rgba, rgba_stride, w, h);
      break;
   }
}

void st_sample_surface	(	struct pipe_surface *	surface,
		float *	rgba
	)

Definition at line 525 of file st_sample.c.

References pipe_surface::block, block(), pipe_surface::format, pipe_surface::height, pipe_format_block::height, MIN2, pipe_surface::nblocksx, pipe_surface::nblocksy, PIPE_BUFFER_USAGE_CPU_READ, pipe_surface_map(), pipe_surface_unmap(), pipe_format_block::size, st_sample_pixel_block(), pipe_surface::stride, pipe_format_block::width, and pipe_surface::width.

{
   const struct pipe_format_block *block = &surface->block;
   unsigned rgba_stride = surface->width*4;
   void *raw;
   unsigned x, y;

   raw = pipe_surface_map(surface, PIPE_BUFFER_USAGE_CPU_READ);
   if(!raw)
      return;

   for (y = 0; y < surface->nblocksy; ++y) {
      for(x = 0; x < surface->nblocksx; ++x) {
         st_sample_pixel_block(surface->format,
                               block,
                               (uint8_t*)raw + y*surface->stride + x*block->size, 
                               rgba + y*block->height*rgba_stride + x*block->width*4,
                               rgba_stride,
                               MIN2(block->width, surface->width - x*block->width), 
                               MIN2(block->height, surface->height - y*block->height));
       }
   }
   
   pipe_surface_unmap(surface);
}

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