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https://github.com/libretro/scummvm.git
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73 lines
2.8 KiB
C++
73 lines
2.8 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "graphics/scaler/downscaler.h"
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#include "graphics/scaler/intern.h"
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int gBitFormat = 565;
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#ifdef USE_ARM_SCALER_ASM
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extern "C" {
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void DownscaleAllByHalfARM(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height, int mask, int round);
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}
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void DownscaleAllByHalf(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
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// Rounding constants and masks used for different pixel formats
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static const int roundingconstants[] = { 0x00200802, 0x00201002 };
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static const int redbluegreenMasks[] = { 0x03E07C1F, 0x07E0F81F };
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const int maskUsed = (gBitFormat == 565);
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DownscaleAllByHalfARM(srcPtr, srcPitch, dstPtr, dstPitch, width, height, redbluegreenMasks[maskUsed], roundingconstants[maskUsed]);
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}
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#else
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template<typename ColorMask>
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void DownscaleAllByHalfTemplate(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
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uint8 *work;
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uint16 srcPitch16 = (uint16)(srcPitch / sizeof(uint16));
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while ((height -= 2) >= 0) {
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work = dstPtr;
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for (int i=0; i<width; i+=2) {
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// Another lame filter attempt :)
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uint16 color1 = *(((const uint16 *)srcPtr) + i);
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uint16 color2 = *(((const uint16 *)srcPtr) + (i + 1));
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uint16 color3 = *(((const uint16 *)srcPtr) + (i + srcPitch16));
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uint16 color4 = *(((const uint16 *)srcPtr) + (i + srcPitch16 + 1));
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*(((uint16 *)work) + 0) = interpolate16_1_1_1_1<ColorMask>(color1, color2, color3, color4);
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work += sizeof(uint16);
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}
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srcPtr += 2 * srcPitch;
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dstPtr += dstPitch;
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}
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}
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void DownscaleAllByHalf(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
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if (gBitFormat == 565)
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DownscaleAllByHalfTemplate<Graphics::ColorMasks<565> >(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
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else
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DownscaleAllByHalfTemplate<Graphics::ColorMasks<555> >(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
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}
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#endif
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