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oscar64/include/gfx/bitmap.c

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#include "bitmap.h"
#include "tinyfont.h"
#include <stdlib.h>
#include <c64/asm6502.h>
void bm_init(Bitmap * bm, char * data, char cw, char ch)
{
bm->rdata = nullptr;
bm->data = data;
bm->cwidth = cw;
bm->cheight = ch;
bm->width = cw * 8;
}
void bm_alloc(Bitmap * bm, char cw, char ch)
{
bm->rdata = malloc(cw * ch * 8 + 8);
bm->data = bm->rdata + 8 - ((int)bm->rdata & 7);
bm->cwidth = cw;
bm->cheight = ch;
bm->width = cw * 8;
}
void bm_free(Bitmap * bm)
{
free(bm->rdata);
}
void bm_fill(Bitmap * bm, char data)
{
memset(bm->data, data, bm->cwidth * bm->cheight * 8);
}
void bm_set(Bitmap * bm, int x, int y)
{
bm->data[bm->cwidth * (y & ~7) + (x & ~7) + (y & 7)] |= 0x80 >> (x & 7);
}
void bm_clr(Bitmap * bm, int x, int y)
{
bm->data[bm->cwidth * (y & ~7) + (x & ~7) + (y & 7)] &= ~(0x80 >> (x & 7));
}
char NineShadesOfGrey[9][8] = {
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // 0
{0x22, 0x00, 0x88, 0x00, 0x22, 0x00, 0x88, 0x00}, // 8
{0x22, 0x88, 0x22, 0x88, 0x22, 0x88, 0x22, 0x88}, // 16
{0x88, 0x55, 0x22, 0x55, 0x88, 0x55, 0x22, 0x55}, // 24
{0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55}, // 32
{0xbb, 0x55, 0xee, 0x55, 0xbb, 0x55, 0xee, 0x55}, // 40
{0xdd, 0x77, 0xdd, 0x77, 0xdd, 0x77, 0xdd, 0x77}, // 48
{0xff, 0xee, 0xff, 0xbb, 0xff, 0xee, 0xff, 0xbb}, // 56
{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, // 64
};
byte BLIT_CODE[16 * 14];
static const byte lmask[8] = {0xff, 0x7f, 0x3f, 0x1f, 0x0f, 0x07, 0x03, 0x01};
static const byte rmask[8] = {0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe};
void bm_scan_fill(int left, int right, char * lp, int x0, int x1, char pat)
{
if (x0 < left)
x0 = left;
if (x1 > right)
x1 = right;
if (x1 > x0)
{
char * dp = lp + (x0 & ~7);
char l = (x1 >> 3) - (x0 >> 3);
char lm = lmask[x0 & 7], rm = rmask[x1 & 7];
char o = 0;
if (l == 0)
rm &= lm;
else
{
*dp = (*dp & ~lm) | (pat & lm);
o = 8;
if (l >= 32)
{
for(char i=0; i<31; i++)
{
dp[o] = pat;
o += 8;
}
dp += 256;
l -= 31;
}
for(char i=1; i<l; i++)
{
dp[o] = pat;
o += 8;
}
}
dp[o] = (dp[o] & ~rm) | (pat & rm);
}
}
static unsigned usqrt(unsigned n)
{
unsigned p, q, r, h
p = 0;
r = n;
q = 0x4000;
while (q > r)
q >>= 2;
while (q != 0)
{
h = p + q;
p >>= 1;
if (r >= h)
{
p += q;
r -= h;
}
q >>= 2;
}
return p;
}
void bm_circle_fill(Bitmap * bm, ClipRect * clip, int x, int y, char r, const char * pattern)
{
int y0 = y - r, y1 = y + r;
if (y0 < clip->top)
y0 = clip->top;
if (y1 > clip->bottom)
y1 = clip->bottom;
const char * pat = pattern;
char * lp = bm->data + bm->cwidth * (y0 & ~7) + (y0 & 7);
int stride = 8 * bm->cwidth - 8;
unsigned rr = r * r + r;
for(char iy=y0; iy<(char)y1; iy++)
{
int d = (iy - y);
int t = usqrt(rr - d * d);
bm_scan_fill(clip->left, clip->right, lp, x - t, x + t + 1, pat[iy & 7]);
lp ++;
if (!((int)lp & 7))
lp += stride;
}
}
void bm_trapezoid_fill(Bitmap * bm, ClipRect * clip, long x0, long x1, long dx0, long dx1, int y0, int y1, const char * pattern)
{
if (y1 <= clip->top || y0 >= clip->bottom)
return;
long tx0 = x0, tx1 = x1;
if (y1 > clip->bottom)
y1 = clip->bottom;
if (y0 < clip->top)
{
tx0 += (clip->top - y0) * dx0;
tx1 += (clip->top - y0) * dx1;
y0 = clip->top;
}
const char * pat = pattern;
char * lp = bm->data + bm->cwidth * (y0 & ~7) + (y0 & 7);
int stride = 8 * bm->cwidth - 8;
for(char iy=y0; iy<(char)y1; iy++)
{
bm_scan_fill(clip->left, clip->right, lp, tx0 >> 16, tx1 >> 16, pat[iy & 7]);
tx0 += dx0;
tx1 += dx1;
lp ++;
if (!((int)lp & 7))
lp += stride;
}
}
void bm_triangle_fill(Bitmap * bm, ClipRect * clip, int x0, int y0, int x1, int y1, int x2, int y2, const char * pat)
{
int t;
if (y1 < y0 && y1 < y2)
{
t = y0; y0 = y1; y1 = t;
t = x0; x0 = x1; x1 = t;
}
else if (y2 < y0)
{
t = y0; y0 = y2; y2 = t;
t = x0; x0 = x2; x2 = t;
}
if (y2 < y1)
{
t = y1; y1 = y2; y2 = t;
t = x1; x1 = x2; x2 = t;
}
if (y0 < y2)
{
long dx1, lx1;
long dx2 = ((long)(x2 - x0) << 16) / (y2 - y0);
long lx2 = (long)x0 << 16;
if (y1 > y0)
{
dx1 = ((long)(x1 - x0) << 16) / (y1 - y0);
if (dx1 < dx2)
bm_trapezoid_fill(bm, clip, lx2, lx2, dx1, dx2, y0, y1, pat);
else
bm_trapezoid_fill(bm, clip, lx2, lx2, dx2, dx1, y0, y1, pat);
if (y2 == y1)
return;
lx2 += dx2 * (y1 - y0);
}
dx1 = ((long)(x2 - x1) << 16) / (y2 - y1);
lx1 = (long)x1 << 16;
if (lx1 < lx2)
bm_trapezoid_fill(bm, clip, lx1, lx2, dx1, dx2, y1, y2, pat);
else
bm_trapezoid_fill(bm, clip, lx2, lx1, dx2, dx1, y1, y2, pat);
}
}
void bm_quad_fill(Bitmap * bm, ClipRect * clip, int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3, const char * pat)
{
bm_triangle_fill(bm, clip, x0, y0, x1, y1, x2, y2, pat);
bm_triangle_fill(bm, clip, x0, y0, x2, y2, x3, y3, pat);
}
void bm_polygon_fill(Bitmap * bm, ClipRect * clip, int * px, int * py, char num, const char * pat)
{
char mi = 0;
int my = py[0];
for(char i=1; i<num; i++)
{
if (py[i] < my)
{
my = py[i];
mi = i;
}
}
char li = mi, ri = mi;
long lx, rx;
do
{
lx = (long)px[li] << 16;
if (li == 0)
li = num;
li--;
} while(py[li] == my);
do
{
rx = (long)px[ri] << 16;
ri++;
if (ri == num)
ri = 0;
}
while (py[ri] == my);
int ty = py[li] < py[ri] ? py[li] : py[ri];
while (ty > my)
{
long dlx = (((long)px[li] << 16) - lx) / (py[li] - my);
long drx = (((long)px[ri] << 16) - rx) / (py[ri] - my);
if (lx < rx || lx == rx && dlx < drx)
bm_trapezoid_fill(bm, clip, lx, rx, dlx, drx, my, ty, pat);
else
bm_trapezoid_fill(bm, clip, rx, lx, drx, dlx, my, ty, pat);
lx += (ty - my) * dlx;
rx += (ty - my) * drx;
my = ty;
while (py[li] == my)
{
lx = (long)px[li] << 16;
if (li == 0)
li = num;
li--;
}
while (py[ri] == my)
{
rx = (long)px[ri] << 16;
ri++;
if (ri == num)
ri = 0;
}
ty = py[li] < py[ri] ? py[li] : py[ri];
}
}
struct Edge
{
char minY, maxY;
long px, dx;
Edge * next;
};
void bm_polygon_nc_fill(Bitmap * bm, ClipRect * clip, int * px, int * py, char num, const char * pattern)
{
Edge * first = nullptr, * active = nullptr;
Edge * e = (Edge *)BLIT_CODE;
char n = num;
if (n > 16)
n = 16;
int top = clip->top, bottom = clip->bottom;
for(char i=0; i<n; i++)
{
char j = i + 1, k = i;
if (j >= n)
j = 0;
if (py[i] != py[j])
{
if (py[i] > py[j])
{
k = j; j = i;
}
int minY = py[k], maxY = py[j];
if (minY < bottom && maxY > top)
{
e->px = ((long)px[k] << 16) + 0x8000;
e->dx = (((long)px[j] << 16) - e->px) / (maxY - minY);
if (minY < top)
{
e->px += e->dx * (top - minY);
minY = top;
}
if (maxY > bottom)
maxY = bottom;
e->minY = minY; e->maxY = maxY;
Edge * pp = nullptr, * pe = first;
while (pe && minY >= pe->minY)
{
pp = pe;
pe = pe->next;
}
e->next = pe;
if (pp)
pp->next = e;
else
first = e;
e++;
}
}
}
if (first)
{
char y = first->minY;
const char * pat = pattern;
char * lp = bm->data + bm->cwidth * (y & ~7) + (y & 7);
int stride = 8 * bm->cwidth - 8;
while (first || active)
{
while (first && first->minY == y)
{
Edge * next = first->next;
Edge * pp = nullptr, * pe = active;
while (pe && (first->px > pe->px || first->px == pe->px && first->dx > pe->dx))
{
pp = pe;
pe = pe->next;
}
first->next = pe;
if (pp)
pp->next = first;
else
active = first;
first = next;
}
Edge * e0 = active;
while (e0)
{
Edge * e1 = e0->next;
bm_scan_fill(clip->left, clip->right, lp, e0->px >> 16, e1->px >> 16, pat[y & 7]);
e0 = e1->next;
}
lp ++;
if (!((int)lp & 7))
lp += stride;
y++;
// remove final edges
Edge * pp = nullptr, * pe = active;
while (pe)
{
if (pe->maxY == y)
{
if (pp)
pp->next = pe->next;
else
active = pe->next;
}
else
{
pe->px += pe->dx;
pp = pe;
}
pe = pe->next;
}
}
}
}
#define REG_SP 0x03
#define REG_DP 0x05
#define REG_PAT 0x07
#define REG_S0 0x08
#define REG_S1 0x09
#define REG_D0 0x0a
#define REG_D1 0x0b
static void buildline(char ly, char lx, int dx, int dy, int stride, bool left, bool up)
{
char ip = 0;
// ylow
ip += asm_im(BLIT_CODE + ip, ASM_LDY, ly);
ip += asm_im(BLIT_CODE + ip, ASM_LDX, lx);
// set pixel
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_D0);
ip += asm_zp(BLIT_CODE + ip, ASM_ASL, REG_PAT);
ip += asm_rl(BLIT_CODE + ip, ASM_BCC, 6);
ip += asm_zp(BLIT_CODE + ip, ASM_INC, REG_PAT);
ip += asm_iy(BLIT_CODE + ip, ASM_ORA, REG_SP);
ip += asm_rl(BLIT_CODE + ip, ASM_BNE, 4);
ip += asm_im(BLIT_CODE + ip, ASM_EOR, 0xff);
ip += asm_iy(BLIT_CODE + ip, ASM_AND, REG_SP);
ip += asm_iy(BLIT_CODE + ip, ASM_STA, REG_SP);
// m >= 0
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_DP + 1);
ip += asm_rl(BLIT_CODE + ip, ASM_BMI, 5 + 15 + 13);
ip += asm_np(BLIT_CODE + ip, up ? ASM_DEY : ASM_INY);
ip += asm_im(BLIT_CODE + ip, ASM_CPY, up ? 0xff : 0x08);
ip += asm_rl(BLIT_CODE + ip, ASM_BNE, 15);
ip += asm_np(BLIT_CODE + ip, ASM_CLC);
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_SP);
ip += asm_im(BLIT_CODE + ip, ASM_ADC, stride & 0xff);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_SP);
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_SP + 1);
ip += asm_im(BLIT_CODE + ip, ASM_ADC, stride >> 8);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_SP + 1);
ip += asm_im(BLIT_CODE + ip, ASM_LDY, up ? 0x07 : 0x00);
ip += asm_np(BLIT_CODE + ip, ASM_SEC);
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_DP);
ip += asm_im(BLIT_CODE + ip, ASM_SBC, dx & 0xff);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_DP);
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_DP + 1);
ip += asm_im(BLIT_CODE + ip, ASM_SBC, dx >> 8);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_DP + 1);
// m < 0
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_DP + 1);
ip += asm_rl(BLIT_CODE + ip, ASM_BPL, 4 + 15 + 13);
ip += asm_zp(BLIT_CODE + ip, left ? ASM_ASL : ASM_LSR, REG_D0);
ip += asm_rl(BLIT_CODE + ip, ASM_BCC, 15);
ip += asm_zp(BLIT_CODE + ip, left ? ASM_ROL : ASM_ROR, REG_D0);
ip += asm_np(BLIT_CODE + ip, ASM_CLC);
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_SP);
ip += asm_im(BLIT_CODE + ip, ASM_ADC, left ? 0xf8 : 0x08);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_SP);
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_SP + 1);
ip += asm_im(BLIT_CODE + ip, ASM_ADC, left ? 0xff : 0x00);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_SP + 1);
ip += asm_np(BLIT_CODE + ip, ASM_CLC);
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_DP);
ip += asm_im(BLIT_CODE + ip, ASM_ADC, dy & 0xff);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_DP);
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_DP + 1);
ip += asm_im(BLIT_CODE + ip, ASM_ADC, dy >> 8);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_DP + 1);
// l --
ip += asm_np(BLIT_CODE + ip, ASM_DEX);
ip += asm_rl(BLIT_CODE + ip, ASM_BNE, 2 - ip);
ip += asm_zp(BLIT_CODE + ip, ASM_DEC, REG_D1);
ip += asm_rl(BLIT_CODE + ip, ASM_BPL, 2 - ip);
ip += asm_np(BLIT_CODE + ip, ASM_RTS);
}
static inline void callline(byte * dst, byte bit, int m, char lh, char pattern)
{
__asm
{
lda dst
sta REG_SP
lda dst + 1
sta REG_SP + 1
lda m
sta REG_DP
lda m + 1
sta REG_DP + 1
lda lh
sta REG_D1
lda bit
sta REG_D0
lda pattern
sta REG_PAT
jsr BLIT_CODE
}
}
void bm_line(Bitmap * bm, int x0, int y0, int x1, int y1, char pattern)
{
int dx = x1 - x0, dy = y1 - y0;
byte quad = 0;
if (dx < 0)
{
quad = 1;
dx = -dx;
}
if (dy < 0)
{
quad |= 2;
dy = -dy;
}
int l;
if (dx > dy)
l = dx;
else
l = dy;
int m = dy - dx;
dx *= 2;
dy *= 2;
char * dp = bm->data + bm->cwidth * (y0 & ~7) + (x0 & ~7);
char bit = 0x80 >> (x0 & 7);
char ry = y0 & 7;
int stride = 8 * bm->cwidth;
buildline(ry, (l + 1) & 0xff, dx, dy, (quad & 2) ? -stride : stride, quad & 1, quad & 2);
callline(dp, bit, m, l >> 8, pattern);
}
static int muldiv(int x, int mul, int div)
{
return (int)((long)x * mul / div);
}
void bm_line_clipped(Bitmap * bm, ClipRect * clip, int x0, int y0, int x1, int y1, char pattern)
{
int dx = x1 - x0, dy = y1 - y0;
if (x0 < x1)
{
if (x1 < clip->left || x0 >= clip->right)
return;
if (x0 < clip->left)
{
y0 += muldiv(clip->left - x0, dy, dx);
x0 = clip->left;
}
if (x1 >= clip->right)
{
y1 -= muldiv(x1 + 1 - clip->right, dy, dx);
x1 = clip->right - 1;
}
}
else if (x1 < x0)
{
if (x0 < clip->left || x1 >= clip->right)
return;
if (x1 < clip->left)
{
y1 += muldiv(clip->left - x1, dy, dx);
x1 = clip->left;
}
if (x0 >= clip->right)
{
y0 -= muldiv(x0 + 1- clip->right, dy, dx);
x0 = clip->right - 1;
}
}
else
{
if (x0 < clip->left || x0 >= clip->right)
return;
}
if (y0 < y1)
{
if (y1 < clip->top || y0 >= clip->bottom)
return;
if (y0 < clip->top)
{
x0 += muldiv(clip->top - y0, dx, dy);
y0 = clip->top;
}
if (y1 >= clip->bottom)
{
x1 -= muldiv(y1 + 1 - clip->bottom, dx, dy);
y1 = clip->bottom - 1;
}
}
else if (y1 < y0)
{
if (y0 < clip->top || y1 >= clip->bottom)
return;
if (y1 < clip->top)
{
x1 += muldiv(clip->top - y1, dx, dy);
y1 = clip->top;
}
if (y0 >= clip->bottom)
{
x0 -= muldiv(y0 + 1 - clip->bottom, dx, dy);
y0 = clip->bottom - 1;
}
}
else
{
if (y0 < clip->top || y0 >= clip->bottom)
return;
}
bm_line(bm, x0, y0, x1, y1, pattern);
}
static inline void callddop(byte * src, byte * dst, byte pat)
{
__asm
{
lda src
sta REG_SP
lda src + 1
sta REG_SP + 1
lda dst
sta REG_DP
lda dst + 1
sta REG_DP + 1
lda pat
sta REG_PAT
jsr BLIT_CODE
}
}
// build code to fetch src, result in accu
static char builddop_src(char ip, char shift, bool reverse)
{
if (shift != 0)
{
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_S0);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_S1);
ip += asm_iy(BLIT_CODE + ip, ASM_LDA, REG_SP);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_S0);
if (reverse)
{
if (shift > 4)
{
for(char i=shift; i<8; i++)
{
ip += asm_zp(BLIT_CODE + ip, ASM_ASL, REG_S1);
ip += asm_ac(BLIT_CODE + ip, ASM_ROL);
}
}
else
{
for(char i=0; i<shift; i++)
{
ip += asm_ac(BLIT_CODE + ip, ASM_LSR);
ip += asm_zp(BLIT_CODE + ip, ASM_ROR, REG_S1);
}
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_S1);
}
}
else
{
if (shift > 4)
{
for(char i=shift; i<8; i++)
{
ip += asm_ac(BLIT_CODE + ip, ASM_ASL);
ip += asm_zp(BLIT_CODE + ip, ASM_ROL, REG_S1);
}
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_S1);
}
else
{
for(char i=0; i<shift; i++)
{
ip += asm_zp(BLIT_CODE + ip, ASM_LSR, REG_S1);
ip += asm_ac(BLIT_CODE + ip, ASM_ROR);
}
}
}
}
else
ip += asm_iy(BLIT_CODE + ip, ASM_LDA, REG_SP);
return ip;
}
static AsmIns blitops_op[4] = {ASM_BRK, ASM_AND, ASM_ORA, ASM_EOR};
static char builddop_op(char ip, BlitOp op)
{
char reg = REG_D0;
if (op & BLIT_PATTERN)
reg = REG_PAT;
if (op & BLIT_IMM)
{
if (op & BLIT_INVERT)
ip += asm_im(BLIT_CODE + ip, ASM_LDA, 0xff);
else
ip += asm_im(BLIT_CODE + ip, ASM_LDA, 0x00);
}
else if (!(op & BLIT_SRC))
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, reg);
else if (op & BLIT_INVERT)
ip += asm_im(BLIT_CODE + ip, ASM_EOR, 0xff);
op &= BLIT_OP;
if (op)
ip += asm_zp(BLIT_CODE + ip, blitops_op[op], reg);
return ip;
}
static void builddop(char shift, char w, char lmask, char rmask, BlitOp op, bool reverse)
{
byte ip = 0;
bool usesrc = op & BLIT_SRC;
bool usedst = op & BLIT_DST;
char asm_clc = ASM_CLC, asm_adc = ASM_ADC, asm_bcc = ASM_BCC, asm_inc = ASM_INC, ystart = 0;
if (reverse)
{
asm_clc = ASM_SEC;
asm_adc = ASM_SBC;
asm_bcc = ASM_BCS;
asm_inc = ASM_DEC;
ystart = 0xf8;
}
ip += asm_im(BLIT_CODE + ip, ASM_LDY, ystart);
ip += asm_iy(BLIT_CODE + ip, ASM_LDA, REG_DP);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_D0);
if (usesrc)
{
ip += asm_iy(BLIT_CODE + ip, ASM_LDA, REG_SP);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_S0);
ip += asm_np(BLIT_CODE + ip, asm_clc);
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_SP);
ip += asm_im(BLIT_CODE + ip, asm_adc, 8);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_SP);
ip += asm_rl(BLIT_CODE + ip, asm_bcc, 2);
ip += asm_zp(BLIT_CODE + ip, asm_inc, REG_SP + 1);
ip = builddop_src(ip, shift, reverse);
}
if (w == 0)
lmask &= rmask;
ip = builddop_op(ip, op);
ip += asm_im(BLIT_CODE + ip, ASM_AND, lmask);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_S1);
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_D0);
ip += asm_im(BLIT_CODE + ip, ASM_AND, ~lmask);
ip += asm_zp(BLIT_CODE + ip, ASM_ORA, REG_S1);
ip += asm_iy(BLIT_CODE + ip, ASM_STA, REG_DP);
if (w > 0)
{
ip += asm_np(BLIT_CODE + ip, asm_clc);
ip += asm_np(BLIT_CODE + ip, ASM_TYA);
ip += asm_im(BLIT_CODE + ip, asm_adc, 8);
ip += asm_np(BLIT_CODE + ip, ASM_TAY);
if (w > 1)
{
ip += asm_im(BLIT_CODE + ip, ASM_LDX, w - 1);
char lp = ip;
if (usedst)
{
ip += asm_iy(BLIT_CODE + ip, ASM_LDA, REG_DP);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_D0);
}
if (usesrc)
{
ip = builddop_src(ip, shift, reverse);
}
ip = builddop_op(ip, op);
ip += asm_iy(BLIT_CODE + ip, ASM_STA, REG_DP);
ip += asm_np(BLIT_CODE + ip, asm_clc);
ip += asm_np(BLIT_CODE + ip, ASM_TYA);
ip += asm_im(BLIT_CODE + ip, asm_adc, 8);
ip += asm_np(BLIT_CODE + ip, ASM_TAY);
if (w > 31)
{
if (usesrc)
{
ip += asm_rl(BLIT_CODE + ip, asm_bcc, 4);
ip += asm_zp(BLIT_CODE + ip, asm_inc, REG_SP + 1);
}
else
{
ip += asm_rl(BLIT_CODE + ip, asm_bcc, 2);
}
ip += asm_zp(BLIT_CODE + ip, asm_inc, REG_DP + 1);
}
ip += asm_np(BLIT_CODE + ip, ASM_DEX);
ip += asm_rl(BLIT_CODE + ip, ASM_BNE, lp - ip - 2);
}
ip += asm_iy(BLIT_CODE + ip, ASM_LDA, REG_DP);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_D0);
if (usesrc)
{
ip = builddop_src(ip, shift, reverse);
}
ip = builddop_op(ip, op);
ip += asm_im(BLIT_CODE + ip, ASM_AND, rmask);
ip += asm_zp(BLIT_CODE + ip, ASM_STA, REG_S1);
ip += asm_zp(BLIT_CODE + ip, ASM_LDA, REG_D0);
ip += asm_im(BLIT_CODE + ip, ASM_AND, ~rmask);
ip += asm_zp(BLIT_CODE + ip, ASM_ORA, REG_S1);
ip += asm_iy(BLIT_CODE + ip, ASM_STA, REG_DP);
}
ip += asm_np(BLIT_CODE + ip, ASM_RTS);
}
void bm_bitblit(Bitmap * dbm, int dx, int dy, Bitmap * sbm, int sx, int sy, int w, int h, const char * pattern, BlitOp op)
{
int rx = dx + w;
char dxh0 = dx >> 3, dxh1 = rx >> 3;
char lm = lmask[dx & 7], rm = rmask[rx & 7];
char cw = dxh1 - dxh0;
bool reverse = dbm == sbm && (dy > sy || dy == sy && dx > sx);
if (reverse)
{
dy += h;
sy += h;
}
char * dp = dbm->data + dbm->cwidth * (dy & ~7) + (dx & ~7) + (dy & 7);
char * sp = sbm->data + sbm->cwidth * (sy & ~7) + (sx & ~7) + (sy & 7);
if (reverse)
{
sp += 8 * cw + 8 - 0xf8;
dp += 8 * cw - 0xf8;
byte t = lm; lm = rm; rm = t;
}
char shift;
if ((dx & 7) > (sx & 7))
{
shift = (dx & 7) - (sx & 7);
sp -= 8;
}
else
{
shift = 8 + (dx & 7) - (sx & 7);
}
builddop(shift, cw, lm, rm, op, reverse);
const char * pat = pattern;
int sstride = 8 * sbm->cwidth - 8;
int dstride = 8 * dbm->cwidth - 8;
if (reverse)
{
sstride = -sstride;
dstride = -dstride;
for(char y=h; y>0; y--)
{
if (((int)sp & 7) == 0)
sp += sstride;
sp--;
if (((int)dp & 7) == 0)
dp += dstride;
dp--;
char pi = (int)dp & 7;
callddop(sp, dp, pat[pi]);
}
}
else
{
for(char y=h; y>0; y--)
{
char pi = (int)dp & 7;
callddop(sp, dp, pat[pi]);
sp++;
if (((int)sp & 7) == 0)
sp += sstride;
dp++;
if (((int)dp & 7) == 0)
dp += dstride;
}
}
}
void bm_bitblit_clipped(Bitmap * dbm, ClipRect * clip, int dx, int dy, Bitmap * sbm, int sx, int sy, int w, int h, const char * pattern, BlitOp op)
{
if (dx >= clip->right || dy >= clip->bottom)
return;
if (dx < clip->left)
{
int d = clip->left - dx;
dx += d;
sx += d;
w -= d;
}
if (dy < clip->top)
{
int d = clip->top - dy;
dy += d;
sy += d;
h -= d;
}
if (dx + w > clip->right)
w = clip->right - dx;
if (dy + h > clip->bottom)
h = clip->bottom - dy;
if (w > 0 && h > 0)
bm_bitblit(dbm, dx, dy, sbm, sx, sy, w, h, pattern, op);
}
inline void bm_rect_fill(Bitmap * dbm, int dx, int dy, int w, int h)
{
bm_bitblit(dbm, dx, dy, dbm, dx, dy, w, h, nullptr, BLTOP_SET);
}
inline void bm_rect_clear(Bitmap * dbm, int dx, int dy, int w, int h)
{
bm_bitblit(dbm, dx, dy, dbm, dx, dy, w, h, nullptr, BLTOP_RESET);
}
inline void bm_rect_pattern(Bitmap * dbm, int dx, int dy, int w, int h, const char * pattern)
{
bm_bitblit(dbm, dx, dy, dbm, dx, dy, w, h, pattern, BLTOP_PATTERN);
}
inline void bm_rect_copy(Bitmap * dbm, int dx, int dy, Bitmap * sbm, int sx, int sy, int w, int h)
{
bm_bitblit(dbm, dx, dy, sbm, sx, sy, w, h, nullptr, BLTOP_COPY);
}
inline void bm_rect_fill_clipped(Bitmap * dbm, ClipRect * clip, int dx, int dy, int w, int h)
{
bm_bitblit_clipped(dbm, clip, dx, dy, dbm, dx, dy, w, h, nullptr, BLTOP_SET);
}
inline void bm_rect_clear_clipped(Bitmap * dbm, ClipRect * clip, int dx, int dy, int w, int h)
{
bm_bitblit_clipped(dbm, clip, dx, dy, dbm, dx, dy, w, h, nullptr, BLTOP_RESET);
}
inline void bm_rect_pattern_clipped(Bitmap * dbm, ClipRect * clip, int dx, int dy, int w, int h, const char * pattern)
{
bm_bitblit_clipped(dbm, clip, dx, dy, dbm, dx, dy, w, h, pattern, BLTOP_PATTERN);
}
inline void bm_rect_copy_clipped(Bitmap * dbm, ClipRect * clip, int dx, int dy, Bitmap * sbm, int sx, int sy, int w, int h)
{
bm_bitblit_clipped(dbm, clip, dx, dy, sbm, sx, sy, w, h, nullptr, BLTOP_COPY);
}
static char tworks[8];
int bm_text(Bitmap * bm, const char * str, char len)
{
char lx = 0;
int tw = 0;
char * cp = bm->data;
for(char fx=0; fx<len; fx++)
{
char ch = str[fx];
ch -= 32;
char f0 = TinyFont[ch], f1 = TinyFont[ch + 96];
const char * fp = TinyFont + 192 + (f0 + ((f1 & 3) << 8));
char w = f1 >> 2;
tw += w + 1;
for(char px=0; px<w; px++)
{
char b = fp[px];
__asm
{
lda b
asl
rol tworks + 0
asl
rol tworks + 1
asl
rol tworks + 2
asl
rol tworks + 3
asl
rol tworks + 4
asl
rol tworks + 5
asl
rol tworks + 6
asl
rol tworks + 7
}
lx++;
if (lx == 8)
{
cp[0] = tworks[0];
cp[1] = tworks[1];
cp[2] = tworks[2];
cp[3] = tworks[3];
cp[4] = tworks[4];
cp[5] = tworks[5];
cp[6] = tworks[6];
cp[7] = tworks[7];
cp += 8;
lx = 0;
}
}
__asm
{
asl tworks + 0
asl tworks + 1
asl tworks + 2
asl tworks + 3
asl tworks + 4
asl tworks + 5
asl tworks + 6
asl tworks + 7
}
lx++;
if (lx == 8)
{
cp[0] = tworks[0];
cp[1] = tworks[1];
cp[2] = tworks[2];
cp[3] = tworks[3];
cp[4] = tworks[4];
cp[5] = tworks[5];
cp[6] = tworks[6];
cp[7] = tworks[7];
cp += 8;
lx = 0;
}
}
while (lx < 8)
{
__asm
{
asl tworks + 0
asl tworks + 1
asl tworks + 2
asl tworks + 3
asl tworks + 4
asl tworks + 5
asl tworks + 6
asl tworks + 7
}
lx++;
}
cp[0] = tworks[0];
cp[1] = tworks[1];
cp[2] = tworks[2];
cp[3] = tworks[3];
cp[4] = tworks[4];
cp[5] = tworks[5];
cp[6] = tworks[6];
cp[7] = tworks[7];
return tw;
}
int bm_text_size(const char * str, char len)
{
int tw = 0;
for(char fx=0; fx<len; fx++)
{
char ch = str[fx] - 32;
char f0 = TinyFont[ch], f1 = TinyFont[ch + 96];
tw += (f1 >> 2) + 1;
}
return tw;
}
static char tbuffer[320];
#pragma align(tbuffer, 8)
static Bitmap tbitmap = {
tbuffer, nullptr, 40, 1, 320
};
int bm_put_chars(Bitmap * bm, int x, int y, const char * str, char len, BlitOp op)
{
int tw = bm_text(&tbitmap, str, len);
bm_bitblit(bm, x, y, &tbitmap, 0, 0, tw, 8, nullptr, op);
return tw;
}
int bm_put_chars_clipped(Bitmap * bm, ClipRect * clip, int x, int y, const char * str, char len, BlitOp op)
{
int tw = 0;
if (y >= clip->bottom || x >= clip->right || y + 8 <= clip->top)
{
for(char fx=0; fx<len; fx++)
{
char ch = str[fx] - 32;
char f0 = TinyFont[ch], f1 = TinyFont[ch + 96];
tw += (f1 >> 2) + 1;
}
return tw;
}
if (x < clip->left)
{
char fx = 0;
while (fx < len)
{
char ch = str[fx] - 32;
char f0 = TinyFont[ch], f1 = TinyFont[ch + 96];
char w = (f1 >> 2) + 1;
if (x + w >= clip->left)
break;
tw += w;
x += w;
fx++;
}
str += fx;
len -= fx;
}
int rx = x;
char fx = 0;
while (fx < len && rx < clip->right)
{
char ch = str[fx] - 32;
char f0 = TinyFont[ch], f1 = TinyFont[ch + 96];
char w = (f1 >> 2) + 1;
rx += w;
tw += w;
fx++;
}
int cw = bm_text(&tbitmap, str, fx);
bm_bitblit_clipped(bm, clip, x, y, &tbitmap, 0, 0, cw, 8, nullptr, op);
while (fx < len)
{
char ch = str[fx] - 32;
char f0 = TinyFont[ch], f1 = TinyFont[ch + 96];
char w = (f1 >> 2) + 1;
tw += w;
fx++;
}
return tw;
}
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