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vpGetImage(3) Library Functions Manual vpGetImage(3) NAME vpGetImage - get a field of the intermediate image SYNOPSIS #include <volpack.h> vpResult vpGetImage(vpc, image, width, height, scan_bytes, pixel_type, im- age_type) vpContext *vpc; void *image; int width, height; int scan_bytes; int pixel_type, image_type; ARGUMENTS vpc VolPack context from vpCreateContext. image 2D array for storing result image. width Width of array in pixels. height Height of array in pixels. scan_bytes Number of bytes per scanline in array. pixel_type Code indicating the format of each pixel in the array. image_type Code indicating the source of the image data (VP_IMAGE_BUFFER or VP_SHADOW_BUFFER). DESCRIPTION This is a debugging function. It is used to retrieve the contents of one of the temporary rendering buffers used during rendering, namely the intermediate image or the shadow buffer. Rendering consists of two stages: the volume is resampled and composited into the intermediate image to produce a distorted volume rendering, and then the intermedi- ate image is warped into the final image. If shadows are enabled then the shadow buffer is used during the first stage to incrementally com- pute which voxels are illuminated by the light source. This function returns images produced during the first stage, before the final warp. This function may be called after a call to one of the rendering rou- tines (see vpRenderRawVolume(3)). If the image_type argument is VP_IM- AGE_BUFFER then data will be copied from the intermediate image. The pixel_type argument specifies what information to copy and the format for storing the data in the output array. The possible values for pixel_type are the same as for the pixel_type argument to vpSetImage. For instance, use VP_LUMINANCE to extract the grayscale intensity (as- suming the current shader produces grayscale pixels). If the image_type argument is VP_SHADOW_BUFFER then data will be copied from the shadow buffer. The only valid option for pixel_type is VP_AL- PHA, since no color information is stored in the shadow buffer. See vpSetImage for details on the pixel formats, the layout of the out- put array, and the remaining arguments. To find the required size for the result array, use vpGeti with the VP_INTERMEDIATE_WIDTH and VP_INTERMEDIATE_HEIGHT options (when im- age_type is VP_IMAGE_BUFFER) or the VP_SHADOW_WIDTH and VP_SHADOW_HEIGHT options (when image_type is VP_SHADOW_BUFFER). ERRORS The normal return value is VP_OK. The following error return values are possible: VPERROR_BAD_SIZE The destination array size is incorrect or there is no interme- diate image. VPERROR_BAD_OPTION The field argument is invalid. SEE ALSO VolPack(3), vpRenderRawVolume(3), vpGeti(3) VolPack vpGetImage(3)
NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | ERRORS | SEE ALSO
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