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REminiscence/graphics.cpp

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/*
* REminiscence - Flashback interpreter
* Copyright (C) 2005-2019 Gregory Montoir (cyx@users.sourceforge.net)
*/
#include "graphics.h"
#include "util.h"
void Graphics::setLayer(uint8_t *layer, int pitch) {
_layer = layer;
_layerPitch = pitch;
}
void Graphics::setClippingRect(int16_t rx, int16_t ry, int16_t rw, int16_t rh) {
debug(DBG_VIDEO, "Graphics::setClippingRect(%d, %d, %d, %d)", rx, ry, rw, rh);
_crx = rx;
_cry = ry;
_crw = rw;
_crh = rh;
}
void Graphics::drawPoint(uint8_t color, const Point *pt) {
debug(DBG_VIDEO, "Graphics::drawPoint() col=0x%X x=%d, y=%d", color, pt->x, pt->y);
if (pt->x >= 0 && pt->x < _crw && pt->y >= 0 && pt->y < _crh) {
*(_layer + (pt->y + _cry) * _layerPitch + pt->x + _crx) = color;
}
}
void Graphics::drawLine(uint8_t color, const Point *pt1, const Point *pt2) {
debug(DBG_VIDEO, "Graphics::drawLine()");
int16_t dxincr1 = 1;
int16_t dyincr1 = 1;
int16_t dx = pt2->x - pt1->x;
if (dx < 0) {
dxincr1 = -1;
dx = -dx;
}
int16_t dy = pt2->y - pt1->y;
if (dy < 0) {
dyincr1 = -1;
dy = -dy;
}
int16_t dxincr2, dyincr2, delta1, delta2;
if (dx < dy) {
dxincr2 = 0;
dyincr2 = 1;
delta1 = dx;
delta2 = dy;
if (dyincr1 < 0) {
dyincr2 = -1;
}
} else {
dxincr2 = 1;
dyincr2 = 0;
delta1 = dy;
delta2 = dx;
if (dxincr1 < 0) {
dxincr2 = -1;
}
}
Point pt;
pt.x = pt1->x;
pt.y = pt1->y;
int16_t octincr1 = delta1 * 2 - delta2 * 2;
int16_t octincr2 = delta1 * 2;
int16_t oct = delta1 * 2 - delta2;
if (delta2 >= 0) {
drawPoint(color, &pt);
while (--delta2 >= 0) {
if (oct >= 0) {
pt.x += dxincr1;
pt.y += dyincr1;
oct += octincr1;
} else {
pt.x += dxincr2;
pt.y += dyincr2;
oct += octincr2;
}
drawPoint(color, &pt);
}
}
}
void Graphics::addEllipseRadius(int16_t y, int16_t x1, int16_t x2) {
debug(DBG_VIDEO, "Graphics::addEllipseRadius()");
if (y >= 0 && y <= _crh) {
y = (y - _areaPoints[0]) * 2;
if (x1 < 0) {
x1 = 0;
}
if (x2 >= _crw) {
x2 = _crw - 1;
}
_areaPoints[y + 1] = x1;
_areaPoints[y + 2] = x2;
}
}
void Graphics::drawEllipse(uint8_t color, bool hasAlpha, const Point *pt, int16_t rx, int16_t ry) {
debug(DBG_VIDEO, "Graphics::drawEllipse()");
bool flag = false;
int16_t y = pt->y - ry;
if (y < 0) {
y = 0;
}
if (y < _crh) {
if (pt->y + ry >= 0) {
_areaPoints[0] = y;
int32_t dy = 0;
int32_t rxsq = rx * rx;
int32_t rxsq2 = rx * rx * 2;
int32_t rxsq4 = rx * rx * 4;
int32_t rysq = ry * ry;
int32_t rysq2 = ry * ry * 2;
int32_t rysq4 = ry * ry * 4;
int32_t dx = 0;
int32_t b = rx * ((rysq2 & 0xFFFF) + (rysq2 >> 16));
int32_t a = 2 * b;
int32_t ny1, ny2, nx1, nx2;
ny1 = ny2 = rysq4 / 2 - a + rxsq;
nx1 = nx2 = rxsq2 - b + rysq;
while (ny2 < 0) {
int16_t x2 = pt->x + rx;
int16_t x1 = pt->x - rx;
int16_t by = pt->y + dy;
int16_t ty = pt->y - dy;
if (x1 != x2) {
addEllipseRadius(by, x1, x2);
if (ty < by) {
addEllipseRadius(ty, x1, x2);
}
}
dy += 1;
dx += rxsq4;
nx1 = dx;
if (nx2 < 0) {
nx2 += nx1 + rxsq2;
ny2 += nx1;
} else {
--rx;
a -= rysq4;
ny1 = a;
nx2 += nx1 + rxsq2 - ny1;
ny2 += nx1 + rysq2 - ny1;
}
}
while (rx >= 0) {
bool flag2 = false;
int16_t x2 = pt->x + rx;
int16_t x1 = pt->x - rx;
int16_t by = pt->y + dy;
int16_t ty = pt->y - dy;
if (!flag && x1 != x2) {
flag2 = true;
addEllipseRadius(by, x1, x2);
if (ty < by) {
addEllipseRadius(ty, x1, x2);
}
}
if (flag2) {
flag = true;
}
--rx;
a -= rysq4;
nx1 = a;
if (ny2 < 0) {
++dy;
flag = false;
dx += rxsq4;
ny2 += dx - nx1 + rysq2;
ny1 = dx - nx1 + rysq2;
} else {
ny2 += rysq2 - nx1;
ny1 = rysq2 - nx1;
}
}
if (flag) {
++dy;
}
while (dy <= ry) {
int16_t ty = pt->y - dy;
int16_t by = pt->y + dy;
if (ty < by) {
addEllipseRadius(ty, pt->x, pt->x);
}
addEllipseRadius(by, pt->x, pt->x);
++dy;
}
y = pt->y + ry + 1;
if (y > _crh) {
y = _crh;
}
y = (y - _areaPoints[0]) * 2;
_areaPoints[y + 1] = -1;
fillArea(color, hasAlpha);
}
}
}
void Graphics::fillArea(uint8_t color, bool hasAlpha) {
debug(DBG_VIDEO, "Graphics::fillArea()");
int16_t *pts = _areaPoints;
uint8_t *dst = _layer + (_cry + *pts++) * _layerPitch + _crx;
int16_t x1 = *pts++;
if (x1 >= 0) {
if (hasAlpha && color > 0xC7) {
do {
const int16_t x2 = MIN<int16_t>(_crw - 1, *pts++);
for (; x1 <= x2; ++x1) {
*(dst + x1) |= color & 8;
}
dst += _layerPitch;
x1 = *pts++;
} while (x1 >= 0);
} else {
do {
const int16_t x2 = MIN<int16_t>(_crw - 1, *pts++);
if (x1 <= x2) {
const int len = x2 - x1 + 1;
memset(dst + x1, color, len);
}
dst += _layerPitch;
x1 = *pts++;
} while (x1 >= 0);
}
}
}
void Graphics::drawSegment(uint8_t color, bool hasAlpha, int16_t ys, const Point *pts, uint8_t numPts) {
debug(DBG_VIDEO, "Graphics::drawSegment()");
int16_t xmin, xmax, ymin, ymax;
xmin = xmax = pts[0].x;
ymin = ymax = pts[0].y;
for (int i = 1; i < numPts; ++i) {
int16_t x = pts[i].x;
int16_t y = pts[i].y;
if ((xmin << 16) + ymin > (x << 16) + y) {
xmin = x;
ymin = y;
}
if ((xmax << 16) + ymax < (x << 16) + y) {
xmax = x;
ymax = y;
}
}
if (xmin < 0) {
xmin = 0;
}
if (xmax >= _crw) {
xmax = _crw - 1;
}
_areaPoints[0] = ys;
_areaPoints[1] = xmin;
_areaPoints[2] = xmax;
_areaPoints[3] = -1;
fillArea(color, hasAlpha);
}
void Graphics::drawPolygonOutline(uint8_t color, const Point *pts, uint8_t numPts) {
debug(DBG_VIDEO, "Graphics::drawPolygonOutline()");
assert(numPts >= 2);
int i;
for (i = 0; i < numPts - 1; ++i) {
drawLine(color, &pts[i], &pts[i + 1]);
}
drawLine(color, &pts[i], &pts[0]);
}
static int32_t calcPolyStep1(int16_t dx, int16_t dy) {
debug(DBG_VIDEO, "Graphics::calcPolyStep1()");
assert(dy != 0);
int32_t a = dx * 256;
if ((a >> 16) < dy) {
a = ((int16_t)(a / dy)) * 256;
} else {
a = ((a / 256) / dy) & 0xFFFF0000;
}
return a;
}
static int32_t calcPolyStep2(int16_t dx, int16_t dy) {
debug(DBG_VIDEO, "Graphics::calcPolyStep2()");
assert(dy != 0);
int32_t a = dx * 256;
if ((a >> 16) < dy) {
a = ((int16_t)(a / dy)) * 256;
} else {
a = ((a / 256) / dy) << 16;
}
return a;
}
static void drawPolygonHelper1(int32_t &x, int16_t &y, int32_t &step, int16_t *&pts, int16_t *&start) {
bool first = true;
x = pts[0];
y = pts[1];
int16_t dy, dx;
do {
if (first) {
first = false;
} else {
x = *pts;
}
--pts;
dy = *pts - y;
--pts;
dx = *pts - x;
} while (dy <= 0 && start < pts);
x <<= 16;
if (dy > 0) {
step = calcPolyStep1(dx, dy);
}
}
static void drawPolygonHelper2(int32_t &x, int16_t &y, int32_t &step, int16_t *&pts, int16_t *&start) {
bool first = true;
x = *start++;
y = *start++;
int16_t dy, dx;
do {
if (first) {
first = false;
} else {
x = *start;
start += 2;
}
dy = start[1] - y;
dx = start[0] - x;
} while (dy <= 0 && start < pts);
x <<= 16;
if (dy > 0) {
step = calcPolyStep2(dx, dy);
}
}
void Graphics::drawPolygon(uint8_t color, bool hasAlpha, const Point *pts, uint8_t numPts) {
debug(DBG_VIDEO, "Graphics::drawPolygon()");
assert(numPts * 4 < 0x100);
int16_t *apts1 = &_areaPoints[AREA_POINTS_SIZE];
int16_t *apts2 = &_areaPoints[AREA_POINTS_SIZE + numPts * 2];
int16_t xmin, xmax, ymin, ymax;
xmin = xmax = pts[0].x;
ymin = ymax = pts[0].y;
int16_t *spts = apts1;
*apts1++ = *apts2++ = pts[0].x;
*apts1++ = *apts2++ = pts[0].y;
for (int p = 1; p < numPts; ++p) {
int16_t x = pts[p].x;
int16_t y = pts[p].y;
if (ymin > y) {
ymin = y;
spts = apts1;
}
if (ymax < y) {
ymax = y;
}
*apts1++ = *apts2++ = x;
*apts1++ = *apts2++ = y;
if (xmin > x) {
xmin = x;
}
if (xmax < x) {
xmax = x;
}
}
int16_t *rpts = _areaPoints;
if (xmax < 0 || xmin >= _crw || ymax < 0 || ymin >= _crh) {
return;
}
if (numPts == 2) {
drawLine(color, &pts[0], &pts[1]);
return;
}
if (ymax == ymin) {
drawSegment(color, hasAlpha, ymax, pts, numPts);
return;
}
int16_t x, dx, y, dy;
int32_t a, b, d, f;
int32_t xstep1 = 0;
int32_t xstep2 = 0;
apts1 = &spts[numPts * 2];
xmax = _crw - 1;
ymax = _crh - 1;
int32_t l1 = 65536;
int32_t l2 = -65536;
if (ymin < 0) {
int16_t x0, y0;
do {
--apts1;
y0 = *apts1;
--apts1;
x0 = *apts1;
} while (y0 < 0);
x = apts1[2];
y = apts1[3];
dy = y0 - y;
dx = x0 - x;
xstep1 = (dy << 16) | dx;
assert(dy != 0);
a = y * dx / dy;
b = (x - a) << 16;
d = xstep1 = calcPolyStep1(dx, dy);
if (d < 0) {
d = -d;
}
if (d < l1) {
d = l2;
}
d /= 2;
b -= d;
do {
x0 = *spts++;
y0 = *spts++;
} while (*(spts + 1) < 0);
dy = spts[1] - y0;
dx = spts[0] - x0;
xstep2 = (dy << 16) | dx;
assert(dy != 0);
a = y0 * dx / dy;
f = (x0 - a) << 16;
d = xstep2 = calcPolyStep2(dx, dy);
if (d < 0) {
d = -d;
}
if (d < l1) {
d = l1;
}
d /= 2;
f += d;
ymin = 0;
*rpts++ = 0;
goto gfx_startLine;
}
*rpts++ = ymin;
gfx_startNewLine:
drawPolygonHelper2(f, ymin, xstep2, apts1, spts);
if (spts >= apts1) {
b = apts1[0] << 16;
dy = apts1[1];
if (dy <= ymax) goto gfx_endLine;
goto gfx_fillArea;
}
drawPolygonHelper1(b, ymin, xstep1, apts1, spts);
d = xstep1;
if (d < 0) {
if (d >= l2) {
d = l1;
}
d /= 2;
b += d;
}
d = xstep2;
if (d >= 0) {
if (d <= l1) {
d = l1;
}
d /= 2;
f += d;
}
d = b;
if (d < 0) {
d = 0;
}
x = f >> 16;
if (x > xmax) {
x = xmax;
}
*rpts++ = d >> 16;
*rpts++ = x;
++ymin;
d = xstep1;
if (d >= 0) {
if (d <= l1) {
d = l1;
}
d /= 2;
}
b += d;
d = xstep2;
if (d < 0) {
if (d >= l2) {
d = l1;
}
d /= 2;
}
f += d;
gfx_startLine:
while (1) {
dy = apts1[1];
if (spts >= apts1) {
break;
} else if (dy > spts[1]) {
dy = spts[1];
if (dy > ymax) {
goto gfx_drawPolygonEnd;
}
dy -= ymin;
if (dy > 0) {
--dy;
do {
a = b;
if (a < 0) {
a = 0;
}
x = f >> 16;
if (x > xmax) {
x = xmax;
}
*rpts++ = a >> 16;
*rpts++ = x;
b += xstep1;
f += xstep2;
--dy;
} while (dy >= 0);
}
drawPolygonHelper2(f, ymin, xstep2, apts1, spts);
d = xstep2;
if (d >= 0) {
if (d <= l1) {
d = l1;
}
d /= 2;
f += d;
} else {
d = b;
if (d < 0) {
d = 0;
}
x = f >> 16;
if (x > xmax) {
x = xmax;
}
*rpts++ = d >> 16;
*rpts++ = x;
++ymin;
d = xstep2;
if (d >= l2) {
d = l1;
}
d /= 2;
f += d;
b += xstep1;
}
} else if (dy == spts[1]) {
if (dy > ymax) goto gfx_drawPolygonEnd;
dy -= ymin;
if (dy > 0) {
--dy;
do {
a = b;
if (a < 0) {
a = 0;
}
x = f >> 16;
if (x > xmax) {
x = xmax;
}
*rpts++ = a >> 16;
*rpts++ = x;
b += xstep1;
f += xstep2;
--dy;
} while (dy >= 0);
}
goto gfx_startNewLine;
} else if (dy > ymax) {
goto gfx_drawPolygonEnd;
} else {
dy -= ymin;
if (dy > 0) {
--dy;
do {
a = b;
if (a < 0) {
a = 0;
}
x = f >> 16;
if (x > xmax) {
x = xmax;
}
*rpts++ = a >> 16;
*rpts++ = x;
b += xstep1;
f += xstep2;
--dy;
} while (dy >= 0);
}
drawPolygonHelper1(b, ymin, xstep1, apts1, spts);
d = xstep1;
if (d < 0) {
if (d >= l2) {
d = l1;
}
d /= 2;
b += d;
} else {
d = b;
if (d < 0) {
d = 0;
}
x = f >> 16;
if (x > xmax) {
x = xmax;
}
*rpts++ = d >> 16;
*rpts++ = x;
++ymin;
d = xstep1;
if (d <= l1) {
d = l1;
}
d /= 2;
b += d;
f += xstep2;
}
}
}
if (dy > ymax) goto gfx_drawPolygonEnd;
dy -= ymin;
if (dy < 0) goto gfx_fillArea;
if (dy > 0) {
--dy;
do {
a = b;
if (a < 0) {
a = 0;
}
x = f >> 16;
if (x > xmax) {
x = xmax;
}
*rpts++ = a >> 16;
*rpts++ = x;
b += xstep1;
f += xstep2;
--dy;
} while (dy >= 0);
}
b = f = (apts1[0] << 16) | apts1[1];
gfx_endLine:
d = xstep1;
if (d >= 0) {
if (d >= l1) {
d /= 2;
b -= d;
}
}
d = xstep2;
if (d < 0) {
d /= 2;
f -= d;
}
a = b;
if (a < 0) {
a = 0;
}
x = f >> 16;
if (x > xmax) {
x = xmax;
}
*rpts++ = a >> 16;
*rpts++ = x;
goto gfx_fillArea;
gfx_drawPolygonEnd:
dy = ymax - ymin;
if (dy >= 0) {
do {
a = b;
if (a < 0) {
a = 0;
}
x = f >> 16;
if (x > xmax) {
x = xmax;
}
*rpts++ = a >> 16;
*rpts++ = x;
b += xstep1;
f += xstep2;
--dy;
} while (dy >= 0);
}
gfx_fillArea:
*rpts++ = -1;
fillArea(color, hasAlpha);
}
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