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dpavlin |
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/* |
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* HT Editor |
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* sysvaccel.cc - generic implementation |
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* |
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* Copyright (C) 2004 Stefan Weyergraf |
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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 version 2 as |
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* published by the Free Software Foundation. |
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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, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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#include "system/sysvaccel.h" |
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#include "tools/snprintf.h" |
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static inline void convertBaseColor(uint &b, uint fromBits, uint toBits) |
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{ |
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if (toBits > fromBits) { |
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b <<= toBits - fromBits; |
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} else { |
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b >>= fromBits - toBits; |
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} |
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} |
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void sys_convert_display( |
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const DisplayCharacteristics &aSrcChar, |
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const DisplayCharacteristics &aDestChar, |
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const void *aSrcBuf, |
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void *aDestBuf, |
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int firstLine, |
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int lastLine) |
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{ |
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byte *src = (byte*)aSrcBuf + aSrcChar.bytesPerPixel * aSrcChar.width * firstLine; |
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byte *dest = (byte*)aDestBuf + aDestChar.bytesPerPixel * aDestChar.width * firstLine; |
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for (int y=firstLine; y <= lastLine; y++) { |
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for (int x=0; x < aSrcChar.width; x++) { |
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uint r, g, b; |
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uint p; |
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switch (aSrcChar.bytesPerPixel) { |
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case 2: |
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p = (src[0] << 8) | src[1]; |
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break; |
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case 4: |
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p = (src[0] << 24) | (src[1] << 16) | (src[2] << 8) | src[3]; |
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break; |
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default: |
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ht_printf("internal error in %s:%d\n", __FILE__, __LINE__); |
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exit(1); |
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break; |
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} |
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r = (p >> aSrcChar.redShift) & ((1<<aSrcChar.redSize)-1); |
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g = (p >> aSrcChar.greenShift) & ((1<<aSrcChar.greenSize)-1); |
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b = (p >> aSrcChar.blueShift) & ((1<<aSrcChar.blueSize)-1); |
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convertBaseColor(r, aSrcChar.redSize, aDestChar.redSize); |
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convertBaseColor(g, aSrcChar.greenSize, aDestChar.greenSize); |
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convertBaseColor(b, aSrcChar.blueSize, aDestChar.blueSize); |
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p = (r << aDestChar.redShift) | (g << aDestChar.greenShift) |
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| (b << aDestChar.blueShift); |
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switch (aDestChar.bytesPerPixel) { |
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case 2: |
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*(uint16*)dest = p; |
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break; |
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case 3: |
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dest[0] = p; dest[1] = p>>8; dest[2] = p>>16; |
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break; |
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case 4: |
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*(uint32*)dest = p; |
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break; |
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default: |
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ht_printf("internal error in %s:%d\n", __FILE__, __LINE__); |
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exit(1); |
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} |
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dest += aDestChar.bytesPerPixel; |
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src += aSrcChar.bytesPerPixel; |
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} |
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dest += aDestChar.scanLineLength - aDestChar.width*aDestChar.bytesPerPixel; |
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src += aSrcChar.scanLineLength - aSrcChar.width*aSrcChar.bytesPerPixel; |
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} |
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} |
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