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133 lines
4.3 KiB
C++
133 lines
4.3 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 <nvcore/Debug.h>
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#include <nvimage/Image.h>
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#include <nvimage/PixelFormat.h>
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#include <nvmath/Color.h>
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#include "CompressRGB.h"
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#include "CompressionOptions.h"
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#include "OutputOptions.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 void convert_to_a8r8g8b8(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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inline void convert_to_x8r8g8b8(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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} // namespace
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// Pixel format converter.
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void nv::compressRGB(const Image * image, const OutputOptions::Private & 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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const uint bitCount = compressionOptions.bitcount;
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nvCheck(bitCount == 8 || bitCount == 16 || bitCount == 24 || bitCount == 32);
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const uint byteCount = bitCount / 8;
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const uint rmask = compressionOptions.rmask;
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uint rshift, rsize;
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PixelFormat::maskShiftAndSize(rmask, &rshift, &rsize);
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const uint gmask = compressionOptions.gmask;
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uint gshift, gsize;
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PixelFormat::maskShiftAndSize(gmask, &gshift, &gsize);
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const uint bmask = compressionOptions.bmask;
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uint bshift, bsize;
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PixelFormat::maskShiftAndSize(bmask, &bshift, &bsize);
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const uint amask = compressionOptions.amask;
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uint ashift, asize;
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PixelFormat::maskShiftAndSize(amask, &ashift, &asize);
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// Determine pitch.
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uint pitch = computePitch(w, compressionOptions.bitcount, 8);
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uint8 * dst = (uint8 *)::malloc(pitch + 4);
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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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if (bitCount == 32 && rmask == 0xFF0000 && gmask == 0xFF00 && bmask == 0xFF && amask == 0xFF000000)
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{
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convert_to_a8r8g8b8(src, dst, w);
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}
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else if (bitCount == 32 && rmask == 0xFF0000 && gmask == 0xFF00 && bmask == 0xFF && amask == 0)
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{
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convert_to_x8r8g8b8(src, dst, w);
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}
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else
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{
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// Generic pixel format conversion.
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for (uint x = 0; x < w; x++)
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{
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uint c = 0;
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c |= PixelFormat::convert(src[x].r, 8, rsize) << rshift;
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c |= PixelFormat::convert(src[x].g, 8, gsize) << gshift;
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c |= PixelFormat::convert(src[x].b, 8, bsize) << bshift;
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c |= PixelFormat::convert(src[x].a, 8, asize) << ashift;
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// Output one byte at a time.
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for (uint i = 0; i < byteCount; i++)
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{
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*(dst + x * byteCount + i) = (c >> (i * 8)) & 0xFF;
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}
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}
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// Zero padding.
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for (uint x = w * byteCount; x < pitch; x++)
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{
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*(dst + x) = 0;
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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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