mirror of
https://github.com/libretro/scummvm.git
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146 lines
5.5 KiB
C++
146 lines
5.5 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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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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#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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extern int gBitFormat;
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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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extern int gBitFormat;
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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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/**
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* This filter (down)scales the source image horizontally by a factor of 1/2.
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* For example, a 320x200 image is scaled to 160x200.
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*/
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template<typename ColorMask>
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void DownscaleHorizByHalfTemplate(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
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uint16 *work;
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// Various casts below go via (void *) to avoid warning. This is
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// safe as these are all even addresses.
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while (height--) {
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work = (uint16 *)(void *)dstPtr;
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for (int i = 0; i < width; i += 2) {
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uint16 color1 = *(((const uint16 *)(const void *)srcPtr) + i);
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uint16 color2 = *(((const uint16 *)(const void *)srcPtr) + (i + 1));
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*work++ = interpolate32_1_1<ColorMask>(color1, color2);
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}
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srcPtr += srcPitch;
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dstPtr += dstPitch;
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}
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}
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void DownscaleHorizByHalf(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
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extern int gBitFormat;
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if (gBitFormat == 565)
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DownscaleHorizByHalfTemplate<Graphics::ColorMasks<565> >(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
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else
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DownscaleHorizByHalfTemplate<Graphics::ColorMasks<555> >(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
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}
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/**
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* This filter (down)scales the source image horizontally by a factor of 3/4.
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* For example, a 320x200 image is scaled to 240x200.
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*/
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template<typename ColorMask>
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void DownscaleHorizByThreeQuartersTemplate(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
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uint16 *work;
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// Various casts below go via (void *) to avoid warning. This is
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// safe as these are all even addresses.
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while (height--) {
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work = (uint16 *)(void *)dstPtr;
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for (int i = 0; i < width; i += 4) {
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// Work with 4 pixels
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uint16 color1 = *(((const uint16 *)(const void *)srcPtr) + i);
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uint16 color2 = *(((const uint16 *)(const void *)srcPtr) + (i + 1));
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uint16 color3 = *(((const uint16 *)(const void *)srcPtr) + (i + 2));
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uint16 color4 = *(((const uint16 *)(const void *)srcPtr) + (i + 3));
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work[0] = interpolate32_3_1<ColorMask>(color1, color2);
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work[1] = interpolate32_1_1<ColorMask>(color2, color3);
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work[2] = interpolate32_3_1<ColorMask>(color4, color3);
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work += 3;
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}
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srcPtr += srcPitch;
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dstPtr += dstPitch;
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}
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}
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void DownscaleHorizByThreeQuarters(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
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extern int gBitFormat;
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if (gBitFormat == 565)
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DownscaleHorizByThreeQuartersTemplate<Graphics::ColorMasks<565> >(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
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else
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DownscaleHorizByThreeQuartersTemplate<Graphics::ColorMasks<555> >(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
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}
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