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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <SDL.h>
#include "controller.h"
#include "graphics.h"
#define GENERIC_LOCK(S) { \
if (SDL_MUSTLOCK(S) && SDL_LockSurface(S)) \
return 1; \
}
#define GENERIC_UNLOCK(S) { \
if (SDL_MUSTLOCK(S)) \
SDL_UnlockSurface(S); \
return 0; \
}
#define XYTOPTR(S, X, Y, BPP) ((Uint8*)(S)->pixels + (Y)*(S)->pitch + (X)*(BPP))
#define SETPIXEL(P, BPP, C) memcpy(P, &(C), BPP)
#define SAFE_SETPIXEL(P, MAX, BPP, C) { \
if (P < MAX) \
SETPIXEL(P, BPP, C); \
}
int
Graphics_DrawHLine(SDL_Surface *s, Uint16 x, Uint16 y, Uint16 l, Uint32 color)
{
Uint8 bpp = s->format->BytesPerPixel;
Uint8 *p = XYTOPTR(s, x, y, bpp);
GENERIC_LOCK(s);
while (l--) {
SETPIXEL(p, bpp, color);
p += bpp;
}
GENERIC_UNLOCK(s);
}
int
Graphics_DrawVLine(SDL_Surface *s, Uint16 x, Uint16 y, Uint16 l, Uint32 color)
{
Uint8 bpp = s->format->BytesPerPixel;
Uint8 *p = XYTOPTR(s, x, y, bpp);
GENERIC_LOCK(s);
while (l--) {
SETPIXEL(p, bpp, color);
p += s->pitch;
}
GENERIC_UNLOCK(s);
}
int
Graphics_DrawRect(SDL_Surface *s, SDL_Rect *rect, Uint32 color)
{
Uint8 bpp = s->format->BytesPerPixel;
Uint8 *p = XYTOPTR(s, rect->x + 1, rect->y, bpp);
Uint32 d;
GENERIC_LOCK(s);
if (rect->w > 2) {
d = (rect->h - 1)*s->pitch;
for (Uint16 w = rect->w - 2; w; w--, p += bpp) {
SETPIXEL(p, bpp, color);
SETPIXEL(p + d, bpp, color);
}
}
d = (rect->w - 1)*bpp;
for (Uint16 h = rect->h; h; h--, p += s->pitch) {
SETPIXEL(p, bpp, color);
SETPIXEL(p - d, bpp, color);
}
GENERIC_UNLOCK(s);
}
int
Graphics_GradFillRect(SDL_Surface *s, SDL_Rect *rect, Uint16 max,
SDL_Color *top, SDL_Color *bottom, SDL_Color *last)
{
Uint8 bpp = s->format->BytesPerPixel;
Uint8 *p = XYTOPTR(s, rect->x, rect->y + rect->h, bpp);
float cr = bottom->r, cg = bottom->g, cb = bottom->b;
float diff_r = (float)(top->r - cr)/max;
float diff_g = (float)(top->g - cg)/max;
float diff_b = (float)(top->b - cb)/max;
Sint8 p_diff = bpp;
GENERIC_LOCK(s);
for (Uint16 h = rect->h; h; h--) {
Uint32 color = SDL_MapRGB(s->format, cr, cg, cb);
for (Uint16 w = rect->w; w; w--, p += p_diff)
SETPIXEL(p, bpp, color);
cr += diff_r;
cg += diff_g;
cb += diff_b;
p -= s->pitch + p_diff;
p_diff = -p_diff;
}
if (last) {
last->r = cr;
last->g = cg;
last->b = cb;
}
GENERIC_UNLOCK(s);
}
int
Graphics_WriteText(SDL_Surface *s, Uint16 x, Uint16 y, const char *text,
Uint32 color)
{
Uint8 bpp = s->format->BytesPerPixel;
Uint8 *p = XYTOPTR(s, x + FONTWIDTH, y, bpp);
Uint8 *max = XYTOPTR(s, 0, s->h, 0);
GENERIC_LOCK(s);
for (const char *c = text; *c; c++, p += bpp*FONTWIDTH) {
const Uint8 *line = Font_Face[*c];
Uint8 *py = p;
for (Uint8 yc = FONTHEIGHT; yc; yc--, line++, py += s->pitch) {
Uint8 col = *line;
Uint8 *px = py;
for (Uint8 xc = FONTWIDTH; xc; xc--, col >>= 1, px -= bpp)
if (col & 1)
SAFE_SETPIXEL(px, max, bpp, color);
}
}
GENERIC_UNLOCK(s);
}
int
Graphics_printf(SDL_Surface *s, Uint16 x, Uint16 y, Uint32 color,
const char *format, ...)
{
char buffer[1024];
va_list args;
int ret;
va_start(args, format);
ret = vsnprintf(buffer, sizeof(buffer), format, args);
va_end(args);
return ret != -1 && ret < sizeof(buffer) &&
!Graphics_WriteText(s, x, y, buffer, color) ? ret : -1;
}
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