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DrawRle.h
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DrawRle.h
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// At this point the following methods should be defined:
// METHODNAME: The name of the drawing method
// METHODNAME_FLIPT: The name of the flipped drawing method
// PIXEL_PTR: type of pointer to the target surface pixels
// PUT_PIXEL(p,c): Draw pixel of color c to pixel ptr type p
// PITCH: This added to PIXEL_PTR type will result in the next scanline
void METHODNAME_FLIP( RLE_SPRITE* src, int dx, int dy )
{
#define RLE_PTR signed char*
#define RLE_IS_EOL(c) ((c) == 0)
//#define PIXEL_PTR unsigned char*
#define OFFSET_PIXEL_PTR(p,x) ((PIXEL_PTR) (p) + (x))
#define INC_PIXEL_PTR(p) ((p)++)
#define DEC_PIXEL_PTR(p) ((p)--)
//#define PUT_PIXEL(p,c) (*((unsigned char *)(p)) = (c))
int x, y, w, h; // width and height of visible area
int dxbeg, dybeg; // beginning in destination
int sxbeg, sybeg; // beginning in source
RLE_PTR s;
SDL_Surface* dst = gamescreen;
// Clip to dst->clip_rect
int dst_cl = dst->clip_rect.x;
int dst_cr = dst->clip_rect.w + dst_cl - 1;
int dst_ct = dst->clip_rect.y;
int dst_cb = dst->clip_rect.h + dst_ct;
// if (dst->clip)
if (1)
{
int tmp;
dxbeg = dx;
if ( dst_cl > dx ) dxbeg = dst_cl;
tmp = dx + src->w - dst_cr;
sxbeg = ((tmp < 0) ? 0 : tmp);
tmp = dx + src->w;
if (tmp > dst_cr ) tmp = dst_cr;
w = tmp - dxbeg;
if (w <= 0)
return;
tmp = dst_ct - dy;
sybeg = ((tmp < 0) ? 0 : tmp);
dybeg = sybeg + dy;
tmp = dst_cb - dy;
h = ((tmp > src->h) ? src->h : tmp) - sybeg;
if (h <= 0)
return;
}
else {
w = src->w;
h = src->h;
sxbeg = 0;
sybeg = 0;
dxbeg = dx;
dybeg = dy;
}
s = (RLE_PTR) (src->dat);
dxbeg += w;
// Clip top.
for (y = sybeg - 1; y >= 0; y--)
{
long c = *s++;
while (!RLE_IS_EOL(c))
{
if (c > 0)
s += c;
c = *s++;
}
}
//@@@ bmp_select(dst);
/* Visible part. */
for (y = 0; y < h; y++)
{
//@@@ PIXEL_PTR d = OFFSET_PIXEL_PTR(bmp_write_line(dst, dybeg + y), dxbeg);
PIXEL_PTR d = (PIXEL_PTR) dst->pixels;
d += (dybeg+y)*PITCH;
d = OFFSET_PIXEL_PTR( d, dxbeg );
long c = *s++;
// Clip left.
for (x = sxbeg; x > 0; )
{
if (RLE_IS_EOL(c))
goto next_line;
else if (c > 0)
{
// Run of solid pixels.
if ((x - c) >= 0)
{
// Fully clipped.
x -= c;
s += c;
}
else
{
// Visible on the right.
c -= x;
s += x;
break;
}
}
else
{
// Run of transparent pixels.
if ((x + c) >= 0) {
// Fully clipped.
x += c;
}
else {
// Visible on the right.
c += x;
break;
}
}
c = *s++;
}
/* Visible part. */
for (x = w; x > 0; )
{
if (RLE_IS_EOL(c))
goto next_line;
else if (c > 0)
{
/* Run of solid pixels. */
if ((x - c) >= 0)
{
/* Fully visible. */
x -= c;
for (c--; c >= 0; s++, DEC_PIXEL_PTR(d), c--)
{
unsigned long col = *s;
PUT_PIXEL(d, col);
}
}
else
{
/* Clipped on the right. */
c -= x;
for (x--; x >= 0; s++, DEC_PIXEL_PTR(d), x--)
{
unsigned long col = *s;
PUT_PIXEL(d, col);
}
break;
}
}
else
{
/* Run of transparent pixels. */
x += c;
d = OFFSET_PIXEL_PTR(d, c);
}
c = *s++;
}
/* Clip right. */
while (!RLE_IS_EOL(c))
{
if (c > 0)
s += c;
c = *s++;
}
next_line: ;
}
//@@@bmp_unwrite_line(dst);
}
void METHODNAME( RLE_SPRITE* src, int dx, int dy )
{
#define RLE_PTR signed char*
#define RLE_IS_EOL(c) ((c) == 0)
//#define PIXEL_PTR unsigned char*
#define OFFSET_PIXEL_PTR(p,x) ((PIXEL_PTR) (p) + (x))
#define INC_PIXEL_PTR(p) ((p)++)
#define DEC_PIXEL_PTR(p) ((p)--)
//#define PUT_PIXEL(p,c) (*((unsigned char *)(p)) = (c))
//#define PUT_PIXEL(p,c) bmp_write8((unsigned long) (p), (c))
int x, y, w, h; // width and height of visible area
int dxbeg, dybeg; // beginning in destination
int sxbeg, sybeg; // beginning in source
RLE_PTR s;
SDL_Surface* dst = gamescreen;
// Clip to dst->clip_rect
int dst_cl = dst->clip_rect.x;
int dst_cr = dst->clip_rect.w + dst_cl;
int dst_ct = dst->clip_rect.y;
int dst_cb = dst->clip_rect.h + dst_ct;
// if (dst->clip)
if (1)
{
int tmp;
tmp = dst_cl - dx;
sxbeg = ((tmp < 0) ? 0 : tmp);
dxbeg = sxbeg + dx;
tmp = dst_cr - dx;
w = ((tmp > src->w) ? src->w : tmp) - sxbeg;
if ( w<=0 ) return;
tmp = dst_ct - dy;
sybeg = ((tmp < 0) ? 0 : tmp);
dybeg = sybeg + dy;
tmp = dst_cb - dy;
h = ((tmp > src->h) ? src->h : tmp) - sybeg;
if ( h<=0 ) return;
}
else
{
w = src->w;
h = src->h;
sxbeg = 0;
sybeg = 0;
dxbeg = dx;
dybeg = dy;
}
s = (RLE_PTR) (src->dat);
/* Clip top. */
for (y = sybeg - 1; y >= 0; y--)
{
long c = *s++;
while (!RLE_IS_EOL(c))
{
if (c > 0)
s += c;
c = *s++;
}
}
//@@@ bmp_select(dst);
/* Visible part. */
for (y = 0; y < h; y++)
{
//@@@ PIXEL_PTR d = OFFSET_PIXEL_PTR(bmp_write_line(dst, dybeg + y), dxbeg);
PIXEL_PTR d = (PIXEL_PTR) dst->pixels;
d += (dybeg+y)*PITCH;
d = OFFSET_PIXEL_PTR( d, dxbeg );
long c = *s++;
/* Clip left. */
for (x = sxbeg; x > 0; ) {
if (RLE_IS_EOL(c))
goto next_line;
else if (c > 0) {
/* Run of solid pixels. */
if ((x - c) >= 0) {
/* Fully clipped. */
x -= c;
s += c;
}
else {
/* Visible on the right. */
c -= x;
s += x;
break;
}
}
else {
/* Run of transparent pixels. */
if ((x + c) >= 0) {
/* Fully clipped. */
x += c;
}
else {
/* Visible on the right. */
c += x;
break;
}
}
c = *s++;
}
/* Visible part. */
for (x = w; x > 0; ) {
if (RLE_IS_EOL(c))
goto next_line;
else if (c > 0) {
/* Run of solid pixels. */
if ((x - c) >= 0) {
/* Fully visible. */
x -= c;
for (c--; c >= 0; s++, INC_PIXEL_PTR(d), c--) {
unsigned long col = (unsigned char) (*s);
PUT_PIXEL(d, col);
}
}
else {
/* Clipped on the right. */
c -= x;
for (x--; x >= 0; s++, INC_PIXEL_PTR(d), x--) {
unsigned long col = *s;
PUT_PIXEL(d, col);
}
break;
}
}
else {
/* Run of transparent pixels. */
x += c;
d = OFFSET_PIXEL_PTR(d, -c);
}
c = *s++;
}
/* Clip right. */
while (!RLE_IS_EOL(c)) {
if (c > 0)
s += c;
c = *s++;
}
next_line: ;
}
//@@@bmp_unwrite_line(dst);
}

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DrawRle.h (6 KB)

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