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154 lines
3.7 KiB
C++
154 lines
3.7 KiB
C++
// Copyright NVIDIA Corporation 2007 -- Ignacio Castano <icastano@nvidia.com>
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#include <string.h>
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#include <nvcore/Debug.h>
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#include <nvimage/Image.h>
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#include "CompressRGB.h"
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#include "CompressionOptions.h"
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using namespace nv;
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using namespace nvtt;
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namespace
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{
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inline uint computePitch(uint w, uint bitsize)
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{
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uint p = w * ((bitsize + 7) / 8);
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// Align to 32 bits.
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return ((p + 3) / 4) * 4;
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}
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static void convert_to_rgba8888(void * src, void * dst, uint w)
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{
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// @@ TODO
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}
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static void convert_to_bgra8888(const void * src, void * dst, uint w)
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{
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memcpy(dst, src, 4 * w);
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}
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static void convert_to_rgb888(const void * src, void * dst, uint w)
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{
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// @@ TODO
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}
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static uint truncate(uint c, uint inbits, uint outbits)
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{
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nvDebugCheck(inbits > outbits);
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c >>= inbits - outbits;
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}
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static uint bitexpand(uint c, uint inbits, uint outbits)
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{
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// @@ TODO
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}
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static void maskShiftAndSize(uint mask, uint & shift, uint & size)
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{
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shift = 0;
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while((mask & 1) == 0) {
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shift++;
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mask >>= 1;
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}
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while((mask & 1) == 1) {
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size++;
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mask >>= 1;
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}
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}
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} // namespace
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// Pixel format converter.
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void nv::compressRGB(const Image * image, const OutputOptions & outputOptions, const CompressionOptions::Private & compressionOptions)
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{
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nvCheck(image != NULL);
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const uint w = image->width();
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const uint h = image->height();
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uint rshift, rsize;
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maskShiftAndSize(compressionOptions.rmask, rshift, rsize);
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uint gshift, gsize;
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maskShiftAndSize(compressionOptions.gmask, gshift, gsize);
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uint bshift, bsize;
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maskShiftAndSize(compressionOptions.bmask, bshift, bsize);
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uint ashift, asize;
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maskShiftAndSize(compressionOptions.amask, ashift, asize);
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// Determine pitch.
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uint pitch = computePitch(w, compressionOptions.bitcount);
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void * dst = malloc(pitch);
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for (uint y = 0; y < h; y++)
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{
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const Color32 * src = image->scanline(y);
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convert_to_bgra8888(src, dst, w);
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if (false)
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{
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// uint c = 0;
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// c |= (src[i].r >> (8 - rsize)) << rshift;
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// c |= (src[i].g >> (8 - gsize)) << gshift;
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// c |= (src[i].b >> (8 - bsize)) << bshift;
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}
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/*
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if (rmask == 0xFF000000 && gmask == 0xFF0000 && bmask == 0xFF00 && amask == 0xFF)
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{
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convert_to_rgba8888(src, dst, w);
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}
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else if (rmask == 0xFF0000 && gmask == 0xFF00 && bmask == 0xFF && amask == 0)
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{
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convert_to_rgb888(src, dst, w);
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}
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else
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{
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// @@ Not supported.
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}
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*/
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if (outputOptions.outputHandler != NULL)
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{
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outputOptions.outputHandler->writeData(dst, pitch);
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}
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}
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free(dst);
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}
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