scummvm/engines/twine/interface.cpp

315 lines
7.9 KiB
C++

/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "twine/interface.h"
#include "twine/twine.h"
namespace TwinE {
Interface::Interface(TwinEEngine *engine) : _engine(engine) {}
const int32 INSIDE = 0; // 0000
const int32 LEFT = 1; // 0001
const int32 RIGHT = 2; // 0010
const int32 TOP = 4; // 0100
const int32 BOTTOM = 8; // 1000
int32 Interface::checkClipping(int32 x, int32 y) {
int32 code = INSIDE;
if (x < textWindowLeft)
code |= LEFT;
else if (x > textWindowRight)
code |= RIGHT;
if (y < textWindowTop)
code |= TOP;
else if (y > textWindowBottom)
code |= BOTTOM;
return code;
}
// TODO: check if Graphics::drawLine() works here
void Interface::drawLine(int32 startWidth, int32 startHeight, int32 endWidth, int32 endHeight, int32 lineColor) {
int32 temp;
int32 flag2;
uint8 *out;
int16 color;
int16 var2;
int16 xchg;
int32 outcode0, outcode1;
int32 x, y, outcodeOut;
int32 currentLineColor = lineColor;
// draw line from left to right
if (startWidth > endWidth) {
temp = endWidth;
endWidth = startWidth;
startWidth = temp;
temp = endHeight;
endHeight = startHeight;
startHeight = temp;
}
// Perform proper clipping (CohenSutherland algorithm)
outcode0 = checkClipping(startWidth, startHeight);
outcode1 = checkClipping(endWidth, endHeight);
while ((outcode0 | outcode1) != 0) {
if (((outcode0 & outcode1) != 0) && (outcode0 != INSIDE))
return; // Reject lines which are behind one clipping plane
// At least one endpoint is outside the clip rectangle; pick it.
outcodeOut = outcode0 ? outcode0 : outcode1;
if (outcodeOut & TOP) { // point is above the clip rectangle
x = startWidth + (int)((endWidth - startWidth) * (float)(textWindowTop - startHeight) / (float)(endHeight - startHeight));
y = textWindowTop;
} else if (outcodeOut & BOTTOM) { // point is below the clip rectangle
x = startWidth + (int)((endWidth - startWidth) * (float)(textWindowBottom - startHeight) / (float)(endHeight - startHeight));
y = textWindowBottom;
} else if (outcodeOut & RIGHT) { // point is to the right of clip rectangle
y = startHeight + (int)((endHeight - startHeight) * (float)(textWindowRight - startWidth) / (float)(endWidth - startWidth));
x = textWindowRight;
} else if (outcodeOut & LEFT) { // point is to the left of clip rectangle
y = startHeight + (int)((endHeight - startHeight) * (float)(textWindowLeft - startWidth) / (float)(endWidth - startWidth));
x = textWindowLeft;
}
// Clip the point
if (outcodeOut == outcode0) {
startWidth = x;
startHeight = y;
outcode0 = checkClipping(startWidth, startHeight);
} else {
endWidth = x;
endHeight = y;
outcode1 = checkClipping(endWidth, endHeight);
}
}
flag2 = 640; //SCREEN_WIDTH;
endWidth -= startWidth;
endHeight -= startHeight;
if (endHeight < 0) {
flag2 = -flag2;
endHeight = -endHeight;
}
out = (uint8*)_engine->frontVideoBuffer.getPixels() + _engine->screenLookupTable[startHeight] + startWidth;
color = currentLineColor;
if (endWidth < endHeight) { // significant slope
xchg = endWidth;
endWidth = endHeight;
endHeight = xchg;
var2 = endWidth;
var2 <<= 1;
startHeight = endWidth;
endHeight <<= 1;
endWidth++;
do {
*out = (uint8)color;
startHeight -= endHeight;
if (startHeight > 0) {
out += flag2;
} else {
startHeight += var2;
out += flag2 + 1;
}
} while (--endWidth);
} else { // reduced slope
var2 = endWidth;
var2 <<= 1;
startHeight = endWidth;
endHeight <<= 1;
endWidth++;
do {
*out = (uint8)color;
out++;
startHeight -= endHeight;
if (startHeight < 0) {
startHeight += var2;
out += flag2;
}
} while (--endWidth);
}
}
void Interface::blitBox(int32 left, int32 top, int32 right, int32 bottom, const int8 *source, int32 leftDest, int32 topDest, int8 *dest) {
int32 width;
int32 height;
const int8 *s;
int8 *d;
int32 insideLine;
int32 temp3;
int32 i;
int32 j;
s = _engine->screenLookupTable[top] + source + left;
d = _engine->screenLookupTable[topDest] + dest + leftDest;
width = right - left + 1;
height = bottom - top + 1;
insideLine = SCREEN_WIDTH - width;
temp3 = left;
left >>= 2;
temp3 &= 3;
for (j = 0; j < height; j++) {
for (i = 0; i < width; i++) {
*(d++) = *(s++);
}
d += insideLine;
s += insideLine;
}
}
void Interface::drawTransparentBox(int32 left, int32 top, int32 right, int32 bottom, int32 colorAdj) {
uint8 *pos;
int32 width;
int32 height;
int32 height2;
int32 temp;
int32 localMode;
int32 var1;
int8 color;
int8 color2;
if (left > SCREEN_TEXTLIMIT_RIGHT)
return;
if (right < SCREEN_TEXTLIMIT_LEFT)
return;
if (top > SCREEN_TEXTLIMIT_BOTTOM)
return;
if (bottom < SCREEN_TEXTLIMIT_TOP)
return;
if (left < SCREEN_TEXTLIMIT_LEFT)
left = SCREEN_TEXTLIMIT_LEFT;
if (right > SCREEN_TEXTLIMIT_RIGHT)
right = SCREEN_TEXTLIMIT_RIGHT;
if (top < SCREEN_TEXTLIMIT_TOP)
top = SCREEN_TEXTLIMIT_TOP;
if (bottom > SCREEN_TEXTLIMIT_BOTTOM)
bottom = SCREEN_TEXTLIMIT_BOTTOM;
pos = _engine->screenLookupTable[top] + (uint8*)_engine->frontVideoBuffer.getPixels() + left;
height2 = height = bottom - top;
height2++;
width = right - left + 1;
temp = 640 - width; // SCREEN_WIDTH
localMode = colorAdj;
do {
var1 = width;
do {
color2 = color = *pos;
color2 &= 0xF0;
color &= 0x0F;
color -= localMode;
if (color < 0)
color = color2;
else
color += color2;
*pos++ = color;
var1--;
} while (var1 > 0);
pos += temp;
height2--;
} while (height2 > 0);
}
void Interface::drawSplittedBox(int32 left, int32 top, int32 right, int32 bottom, uint8 e) { // Box
uint8 *ptr;
int32 offset;
int32 x;
int32 y;
if (left > SCREEN_TEXTLIMIT_RIGHT)
return;
if (right < SCREEN_TEXTLIMIT_LEFT)
return;
if (top > SCREEN_TEXTLIMIT_BOTTOM)
return;
if (bottom < SCREEN_TEXTLIMIT_TOP)
return;
// cropping
offset = -((right - left) - SCREEN_WIDTH);
ptr = (uint8*)_engine->frontVideoBuffer.getPixels() + _engine->screenLookupTable[top] + left;
for (x = top; x < bottom; x++) {
for (y = left; y < right; y++) {
*(ptr++) = e;
}
ptr += offset;
}
}
void Interface::setClip(int32 left, int32 top, int32 right, int32 bottom) {
if (left < 0)
left = 0;
textWindowLeft = left;
if (top < 0)
top = 0;
textWindowTop = top;
if (right >= SCREEN_WIDTH)
right = SCREEN_TEXTLIMIT_RIGHT;
textWindowRight = right;
if (bottom >= SCREEN_HEIGHT)
bottom = SCREEN_TEXTLIMIT_BOTTOM;
textWindowBottom = bottom;
}
void Interface::saveClip() { // saveTextWindow
textWindowLeftSave = textWindowLeft;
textWindowTopSave = textWindowTop;
textWindowRightSave = textWindowRight;
textWindowBottomSave = textWindowBottom;
}
void Interface::loadClip() { // loadSavedTextWindow
textWindowLeft = textWindowLeftSave;
textWindowTop = textWindowTopSave;
textWindowRight = textWindowRightSave;
textWindowBottom = textWindowBottomSave;
}
void Interface::resetClip() {
textWindowTop = textWindowLeft = SCREEN_TEXTLIMIT_TOP;
textWindowRight = SCREEN_TEXTLIMIT_RIGHT;
textWindowBottom = SCREEN_TEXTLIMIT_BOTTOM;
}
} // namespace TwinE