mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-15 14:18:37 +00:00
371 lines
8.6 KiB
C++
371 lines
8.6 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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* $URL$
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* $Id$
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*
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*/
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#include "scumm/scumm.h"
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#include "scumm/akos.h"
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#include "scumm/bomp.h"
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#include "scumm/util.h"
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namespace Scumm {
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static int32 setupBompScale(byte *scaling, int32 size, byte scale);
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static void bompScaleFuncX(byte *line_buffer, byte *scaling_x_ptr, byte skip, int32 size);
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static void bompApplyShadow0(const byte *shadowPalette, const byte *line_buffer, byte *dst, int32 size, byte transparency, bool HE7Check);
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static void bompApplyShadow1(const byte *shadowPalette, const byte *line_buffer, byte *dst, int32 size, byte transparency);
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static void bompApplyShadow3(const byte *shadowPalette, const byte *line_buffer, byte *dst, int32 size, byte transparency);
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static void bompApplyActorPalette(byte *actorPalette, byte *line_buffer, int32 size);
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void decompressBomp(byte *dst, const byte *src, int w, int h) {
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assert(w > 0);
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assert(h > 0);
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do {
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bompDecodeLine(dst, src + 2, w);
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src += READ_LE_UINT16(src) + 2;
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dst += w;
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} while (--h);
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}
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void bompDecodeLine(byte *dst, const byte *src, int len) {
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assert(len > 0);
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int num;
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byte code, color;
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while (len > 0) {
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code = *src++;
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num = (code >> 1) + 1;
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if (num > len)
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num = len;
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len -= num;
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if (code & 1) {
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color = *src++;
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memset(dst, color, num);
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} else {
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memcpy(dst, src, num);
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src += num;
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}
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dst += num;
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}
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}
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void bompDecodeLineReverse(byte *dst, const byte *src, int len) {
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assert(len > 0);
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dst += len;
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int num;
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byte code, color;
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while (len > 0) {
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code = *src++;
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num = (code >> 1) + 1;
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if (num > len)
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num = len;
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len -= num;
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dst -= num;
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if (code & 1) {
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color = *src++;
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memset(dst, color, num);
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} else {
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memcpy(dst, src, num);
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src += num;
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}
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}
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}
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void bompApplyMask(byte *line_buffer, byte *mask, byte maskbit, int32 size, byte transparency) {
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while (1) {
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do {
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if (size-- == 0)
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return;
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if (*mask & maskbit) {
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*line_buffer = transparency;
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}
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line_buffer++;
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maskbit >>= 1;
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} while (maskbit);
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mask++;
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maskbit = 128;
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}
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}
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void bompApplyShadow(int shadowMode, const byte *shadowPalette, const byte *line_buffer, byte *dst, int32 size, byte transparency, bool HE7Check) {
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assert(size > 0);
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switch (shadowMode) {
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case 0:
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bompApplyShadow0(shadowPalette, line_buffer, dst, size, transparency, HE7Check);
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break;
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case 1:
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bompApplyShadow1(shadowPalette, line_buffer, dst, size, transparency);
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break;
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case 3:
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bompApplyShadow3(shadowPalette, line_buffer, dst, size, transparency);
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break;
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default:
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error("Unknown shadow mode %d", shadowMode);
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}
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}
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void bompApplyShadow0(const byte *shadowPalette, const byte *line_buffer, byte *dst, int32 size, byte transparency, bool HE7Check) {
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while (size-- > 0) {
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byte tmp = *line_buffer++;
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if (tmp != transparency) {
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if (HE7Check)
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*dst = shadowPalette[tmp];
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else
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*dst = tmp;
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}
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dst++;
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}
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}
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void bompApplyShadow1(const byte *shadowPalette, const byte *line_buffer, byte *dst, int32 size, byte transparency) {
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while (size-- > 0) {
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byte tmp = *line_buffer++;
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if (tmp != transparency) {
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if (tmp == 13) {
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tmp = shadowPalette[*dst];
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}
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*dst = tmp;
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}
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dst++;
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}
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}
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void bompApplyShadow3(const byte *shadowPalette, const byte *line_buffer, byte *dst, int32 size, byte transparency) {
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while (size-- > 0) {
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byte tmp = *line_buffer++;
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if (tmp != transparency) {
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if (tmp < 8) {
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tmp = shadowPalette[*dst + (tmp << 8)];
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}
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*dst = tmp;
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}
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dst++;
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}
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}
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void bompApplyActorPalette(byte *actorPalette, byte *line_buffer, int32 size) {
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actorPalette[255] = 255;
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while (size-- > 0) {
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*line_buffer = actorPalette[*line_buffer];
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line_buffer++;
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}
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}
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void bompScaleFuncX(byte *line_buffer, byte *scaling_x_ptr, byte skip, int32 size) {
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byte *line_ptr1 = line_buffer;
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byte *line_ptr2 = line_buffer;
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byte tmp = *scaling_x_ptr++;
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while (size--) {
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if ((skip & tmp) == 0) {
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*line_ptr1++ = *line_ptr2;
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}
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line_ptr2++;
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skip >>= 1;
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if (skip == 0) {
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skip = 128;
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tmp = *scaling_x_ptr++;
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}
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}
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}
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void drawBomp(const BompDrawData &bd) {
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const byte *src;
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byte *dst;
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byte *mask = 0;
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Common::Rect clip;
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byte *scalingYPtr = 0;
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byte skip_y_bits = 0x80;
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byte skip_y_new = 0;
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byte tmp;
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byte bomp_scaling_x[64];
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byte bomp_scaling_y[64];
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if (bd.x < 0) {
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clip.left = -bd.x;
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} else {
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clip.left = 0;
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}
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if (bd.y < 0) {
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clip.top = -bd.y;
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} else {
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clip.top = 0;
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}
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clip.right = bd.srcwidth;
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if (clip.right > bd.dst.w - bd.x) {
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clip.right = bd.dst.w - bd.x;
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}
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clip.bottom = bd.srcheight;
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if (clip.bottom > bd.dst.h - bd.y) {
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clip.bottom = bd.dst.h - bd.y;
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}
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src = bd.src;
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dst = (byte *)bd.dst.pixels + bd.y * bd.dst.pitch + (bd.x + clip.left);
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const byte maskbit = revBitMask((bd.x + clip.left) & 7);
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// Mask against any additionally imposed mask
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if (bd.maskPtr) {
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mask = bd.maskPtr + (bd.y * bd.numStrips) + ((bd.x + clip.left) / 8);
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}
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// Setup vertical scaling
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if (bd.scale_y != 255) {
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int scaleBottom = setupBompScale(bomp_scaling_y, bd.srcheight, bd.scale_y);
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scalingYPtr = bomp_scaling_y;
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skip_y_new = *scalingYPtr++;
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skip_y_bits = 0x80;
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if (clip.bottom > scaleBottom) {
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clip.bottom = scaleBottom;
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}
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}
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// Setup horizontal scaling
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if (bd.scale_x != 255) {
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int scaleRight = setupBompScale(bomp_scaling_x, bd.srcwidth, bd.scale_x);
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if (clip.right > scaleRight) {
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clip.right = scaleRight;
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}
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}
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const int width = clip.right - clip.left;
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if (width <= 0)
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return;
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int pos_y = 0;
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byte line_buffer[1024];
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byte *line_ptr = line_buffer + clip.left;
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// Loop over all lines
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while (pos_y < clip.bottom) {
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// Decode a single (bomp encoded) line, reversed if we are in mirror mode
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if (bd.mirror)
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bompDecodeLineReverse(line_buffer, src + 2, bd.srcwidth);
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else
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bompDecodeLine(line_buffer, src + 2, bd.srcwidth);
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src += READ_LE_UINT16(src) + 2;
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// If vertical scaling is enabled, do it
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if (bd.scale_y != 255) {
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// A bit set means we should skip this line...
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tmp = skip_y_new & skip_y_bits;
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// Advance the scale-skip bit mask, if it's 0, get the next scale-skip byte
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skip_y_bits /= 2;
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if (skip_y_bits == 0) {
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skip_y_bits = 0x80;
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skip_y_new = *scalingYPtr++;
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}
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// Skip the current line if the above check tells us to
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if (tmp != 0)
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continue;
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}
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// Perform horizontal scaling
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if (bd.scale_x != 255) {
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bompScaleFuncX(line_buffer, bomp_scaling_x, 0x80, bd.srcwidth);
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}
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// The first clip.top lines are to be clipped, i.e. not drawn
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if (clip.top > 0) {
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clip.top--;
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} else {
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// Replace the parts of the line which are masked with the transparency color
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if (bd.maskPtr)
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bompApplyMask(line_ptr, mask, maskbit, width, 255);
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// Apply custom color map, if available
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if (bd.actorPalette)
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bompApplyActorPalette(bd.actorPalette, line_ptr, width);
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// Finally, draw the decoded, scaled, masked and recolored line onto
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// the target surface, using the specified shadow mode
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bompApplyShadow(bd.shadowMode, bd.shadowPalette, line_ptr, dst, width, 255);
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}
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// Advance to the next line
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pos_y++;
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mask += bd.numStrips;
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dst += bd.dst.pitch;
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}
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}
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int32 setupBompScale(byte *scaling, int32 size, byte scale) {
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static const int offsets[8] = { 3, 2, 1, 0, 7, 6, 5, 4 };
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int32 count;
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byte bitsCount = 0;
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count = (256 - size / 2);
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assert(0 <= count && count < 768);
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const byte *scaleTable = bigCostumeScaleTable + count;
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count = (size + 7) / 8;
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while (count--) {
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byte scaleMask = 0;
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for (int i = 0; i < 8; i++) {
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byte scaleTest = *(scaleTable + offsets[i]);
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scaleMask <<= 1;
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if (scale < scaleTest) {
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scaleMask |= 1;
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} else {
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bitsCount++;
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}
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}
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scaleTable += 8;
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*scaling++ = scaleMask;
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}
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size &= 7;
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if (size != 0) {
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--scaling;
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if ((*scaling & revBitMask(size)) == 0) {
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*scaling |= revBitMask(size);
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bitsCount--;
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}
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}
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return bitsCount;
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}
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} // End of namespace Scumm
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