137 lines
4.1 KiB
C++
137 lines
4.1 KiB
C++
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/* ScummVMDS - Scumm Interpreter DS Port
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* Copyright (C) 2002-2004 The ScummVM project and Neil Millstone
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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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*
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include "stdafx.h"
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#define CHARSET_MASK_TRANSPARENCY 253
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namespace DS {
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void asmDrawStripToScreen(int height, int width, byte const* text, byte const* src, byte* dst,
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int vsPitch, int vmScreenWidth, int textSurfacePitch) {
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if (height <= 0) height = 1;
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if (width < 4) return;
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width &= ~4;
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// src = (const byte *) (((int) (src)) & (~4));
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// dst = (byte *) (((int) (dst)) & (~4));
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// text = (const byte *) (((int) (text)) & (~4));
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asm ( "mov r5, %0\n" // Height
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"yLoop:\n"
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"mov r3, #0\n" // X pos
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"xLoop:\n"
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"ldr r4, [%2, r3]\n" // Load text layer word
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"cmp r4, %5\n"
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"bne singleByteCompare\n"
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"ldr r4, [%3, r3]\n"
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"str r4, [%4, r3]\n"
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"add r3, r3, #4\n"
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"cmp r3, %1\n" // x == width?
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"blt xLoop\n"
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"add %2, %2, %8\n" // src += vs->pitch
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"add %3, %3, %6\n" // dst += _vm->_screenWidth
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"add %4, %4, %7\n" // text += _textSurface.pitch
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"sub r5, r5, #1\n" // y -= 1
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"cmp r5, #0\n" // y == 0?
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"bne yLoop\n"
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"b end\n"
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"singleByteCompare:\n"
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"ldrb r4, [%2, r3]\n" // Load text byte
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"cmps r4, %5, lsr #24\n" // Compare with mask
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"strneb r4, [%4, r3]\n" // Store if not equal
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"ldreqb r4, [%3, r3]\n" // Otherwise Load src byte
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"streqb r4, [%4, r3]\n" // Store it
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"add r3, r3, #1\n"
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"ldrb r4, [%2, r3]\n" // Load text byte
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"cmps r4, %5, lsr #24\n" // Compare with mask
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"strneb r4, [%4, r3]\n" // Store if not equal
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"ldreqb r4, [%3, r3]\n" // Otherwise Load src byte
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"streqb r4, [%4, r3]\n" // Store it
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"add r3, r3, #1\n"
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"ldrb r4, [%2, r3]\n" // Load text byte
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"cmps r4, %5, lsr #24\n" // Compare with mask
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"strneb r4, [%4, r3]\n" // Store if not equal
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"ldreqb r4, [%3, r3]\n" // Otherwise Load src byte
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"streqb r4, [%4, r3]\n" // Store it
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"add r3, r3, #1\n"
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"ldrb r4, [%2, r3]\n" // Load text byte
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"cmps r4, %5, lsr #24\n" // Compare with mask
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"strneb r4, [%4, r3]\n" // Store if not equal
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"ldreqb r4, [%3, r3]\n" // Otherwise Load src byte
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"streqb r4, [%4, r3]\n" // Store it
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"add r3, r3, #1\n"
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"cmps r3, %1\n" // x == width?
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"blt xLoop\n" // Repeat
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"add %2, %2, %8\n" // src += vs->pitch
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"add %3, %3, %6\n" // dst += _vm->_screenWidth
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"add %4, %4, %7\n" // text += _textSurface.pitch
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"sub r5, r5, #1\n" // y -= 1
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"cmp r5, #0\n" // y == 0?
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"bne yLoop\n"
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"end:\n"
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: /* no output registers */
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: "r" (height), "r" (width), "r" (text), "r" (src), "r" (dst), "r" (CHARSET_MASK_TRANSPARENCY | (CHARSET_MASK_TRANSPARENCY << 8) | (CHARSET_MASK_TRANSPARENCY << 16) | (CHARSET_MASK_TRANSPARENCY << 24)),
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"r" (vsPitch), "r" (vmScreenWidth), "r" (textSurfacePitch)
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: "r5", "r3", "r4", "%2", "%3", "%4", "memory");
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}
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void asmCopy8Col(byte* dst, int dstPitch, const byte* src, int height) {
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asm("ands r0, %3, #1\n"
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"addne %3, %3, #1\n"
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"bne roll2\n"
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"yLoop2:\n"
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"ldr r0, [%2, #0]\n"
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"str r0, [%0, #0]\n"
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"ldr r0, [%2, #4]\n"
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"str r0, [%0, #4]\n"
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"add %0, %0, %1\n"
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"add %2, %2, %1\n"
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"roll2:\n"
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"ldr r0, [%2, #0]\n"
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"str r0, [%0, #0]\n"
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"ldr r0, [%2, #4]\n"
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"str r0, [%0, #4]\n"
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"add %0, %0, %1\n"
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"add %2, %2, %1\n"
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"subs %3, %3, #2\n"
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"bne yLoop2\n"
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: /* no output registers */
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: "r" (dst), "r" (dstPitch), "r" (src), "r" (height)
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: "r0", "%0", "%2", "%3");
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}
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}
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