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/*
Simple graphic handling library
Under GPL v2 License
2011 by bitrider
*/
#include <stdlib.h>
#include <stdio.h>
#include "graphics.h"
static int clipping_x1 = 0;
static int clipping_x2 = SCREEN_WIDTH - 1;
static int clipping_y1 = 0;
static int clipping_y2 = SCREEN_HEIGHT - 1;
void gSetClipping(int x1, int y1, int x2, int y2) {
if (x1 < 0) x1 = 0;
if (x1 > (SCREEN_WIDTH -1)) x1 = (SCREEN_WIDTH -1);
if (x2 < 0) x2 = 0;
if (x2 > (SCREEN_WIDTH -1)) x2 = (SCREEN_WIDTH -1);
if (y1 < 0) y1 = 0;
if (y1 > (SCREEN_HEIGHT - 1)) y1 = (SCREEN_HEIGHT - 1);
if (y2 < 0) y2 = 0;
if (y2 > (SCREEN_HEIGHT - 1)) y2 = (SCREEN_HEIGHT - 1);
if (x1 < x2) {
clipping_x1 = x1;
clipping_x2 = x2;
} else {
clipping_x2 = x1;
clipping_x1 = x2;
}
if (y1 < y2) {
clipping_y1 = y1;
clipping_y2 = y2;
} else {
clipping_y2 = y1;
clipping_y1 = y2;
}
}
void gClearClipping() {
clipping_x1 = 0;
clipping_y1 = 0;
clipping_x2 = SCREEN_WIDTH - 1;
clipping_y2 = SCREEN_HEIGHT - 1;
}
void gDestroyBitmap(gBITMAP *img) {
if (img) {
free(img->data);
free(img);
}
}
gBITMAP *gCreateBitmap(unsigned int width, unsigned int height, unsigned char bpp) {
gBITMAP *img;
if (bpp != 32) return NULL; // supported BPPs
if ((!width) || (!height)) return NULL;
img = malloc(sizeof(gBITMAP));
if (!img) return NULL;
img->bpp = bpp;
img->w = width;
img->h = height;
img->data = malloc(width * height * (bpp >> 3));
if (!img->data) {
free(img);
return NULL;
}
return img;
}
void gDrawPixel16(unsigned short *screen, int x, int y, unsigned char r, unsigned char g, unsigned char b) {
unsigned int sr, sg, sb;
unsigned short pixel;
if ((x < clipping_x1) || (x > clipping_x2) || (y < clipping_y1) || (y > clipping_y2)) return;
// blend
screen[y * SCREEN_WIDTH + x] = RGB16(r, g, b);
}
void gBlendPixel16(unsigned short *screen, int x, int y, unsigned char r, unsigned char g, unsigned char b, unsigned char a) {
unsigned int sr, sg, sb;
unsigned short pixel;
if ((x < clipping_x1) || (x > clipping_x2) || (y < clipping_y1) || (y > clipping_y2)) return;
// get screen pixel
pixel = screen[y * SCREEN_WIDTH + x];
sr = PIXEL16_R(pixel); //((pixel >> 11) << 3);
sg = PIXEL16_G(pixel); //((pixel >> 5) & 63) << 2;
sb = PIXEL16_B(pixel); //(pixel & 31) << 3;
// blend
screen[y * SCREEN_WIDTH + x] = RGB16(BLEND(r, a, sr), BLEND(g, a, sg), BLEND(b, a, sb));
}
void gBlendBitmap16(unsigned short *screen, int sx, int sy, gBITMAP *img, unsigned int ix, unsigned int iy, unsigned int iw, unsigned int ih) {
int ssx;
unsigned int sw, ijmp, sjmp;
unsigned char *iaddr;
unsigned int pixel;
if ((!img) || (!img->data)) return; // sanity check
if (img->bpp != 32) return; // supported BPPs
if ((sx > clipping_x2) || (sy > clipping_y2) ||
((sx + iw - 1) < clipping_x1) || ((sy + ih - 1) < clipping_y1)) return; // Out of screen
// Image dimensions
if ((iw + ix) > img->w) iw = img->w - ix;
if ((ih + iy) > img->h) ih = img->h - iy;
// Clipping
if (sx < clipping_x1) {
iw -= clipping_x1 - sx;
sx = clipping_x1;
}
if (sy < clipping_y1) {
ih -= clipping_y1 - sy;
sy = clipping_y1;
}
if ((sx + iw - 1) > clipping_x2) iw -= (sx + iw - 1) - clipping_x2;
if ((sy + ih - 1) > clipping_y2) ih -= (sy + ih - 1) - clipping_y2;
ssx = sx;
sw = iw;
ijmp = (img->w - iw) * (img->bpp >> 3);
iaddr = &img->data[(iy * img->w + ix) * 4 + 0];
sjmp = SCREEN_WIDTH - iw;
screen = &screen[sy * SCREEN_WIDTH + sx];
for (; (ih > 0); ih--, iaddr += ijmp, screen += sjmp) {
for (iw = sw; (iw > 0); iw--, iaddr += 4, screen++) {
// blend
pixel = *((unsigned int *)iaddr);
/*
*screen = RGB16(BLEND(iaddr[0], iaddr[3], PIXEL16_R(*screen)),
BLEND(iaddr[1], iaddr[3], PIXEL16_G(*screen)),
BLEND(iaddr[2], iaddr[3], PIXEL16_B(*screen)));
*/
*screen = RGB16(BLEND(PIXEL32_R(pixel), PIXEL32_A(pixel), PIXEL16_R(*screen)),
BLEND(PIXEL32_G(pixel), PIXEL32_A(pixel), PIXEL16_G(*screen)),
BLEND(PIXEL32_B(pixel), PIXEL32_A(pixel), PIXEL16_B(*screen)));
}
}
}
void gDrawBitmap16(unsigned short *screen, int sx, int sy, gBITMAP *img, unsigned int ix, unsigned int iy, unsigned int iw, unsigned int ih) {
int ssx;
unsigned int sw, ijmp, sjmp;
unsigned char *iaddr;
unsigned short pixel;
if ((!img) || (!img->data)) return; // sanity check
if ((img->bpp != 32) || (img->bpp != 32)) return; // supported BPPs
if ((sx > clipping_x2) || (sy > clipping_y2) ||
((sx + iw - 1) < clipping_x1) || ((sy + ih - 1) < clipping_y1)) return; // Out of screen
// Image dimensions
if ((iw + ix) > img->w) iw = img->w - ix;
if ((ih + iy) > img->h) ih = img->h - iy;
// Clipping
if (sx < clipping_x1) {
iw -= clipping_x1 - sx;
sx = clipping_x1;
}
if (sy < clipping_y1) {
ih -= clipping_y1 - sy;
sy = clipping_y1;
}
if ((sx + iw - 1) > clipping_x2) iw -= (sx + iw - 1) - clipping_x2;
if ((sy + ih - 1) > clipping_y2) ih -= (sy + ih - 1) - clipping_y2;
ssx = sx;
sw = iw;
ijmp = (img->w - iw) * (img->bpp >> 3);
iaddr = &img->data[(iy * img->w + ix) * (img->bpp >> 3) + 0];
sjmp = SCREEN_WIDTH - iw;
screen = &screen[sy * SCREEN_WIDTH + sx];
switch (img->bpp) {
case 32:
for (; (ih > 0); ih--, iaddr += ijmp, screen += sjmp) {
for (iw = sw; (iw > 0); iw--, iaddr += 4, screen++) {
*screen = RGB16(iaddr[0], iaddr[1], iaddr[2]);
}
}
break;
case 16:
for (; (ih > 0); ih--, iaddr += ijmp, screen += sjmp) {
for (iw = sw; (iw > 0); iw--, iaddr += 2) {
*screen++ = *(unsigned short *)iaddr;
}
}
break;
}
}
void gDrawScaledBitmap16(unsigned short *screen, int sx, int sy, gBITMAP *img, unsigned int iw, unsigned int ih) {
int dx, dy;
int x , y, fp_x, w, h;
unsigned int *addr;
unsigned int pixel;
if ((!img) || (!img->data)) return; // sanity check
if ((img->bpp != 32) || (img->bpp != 32)) return; // supported BPPs
#define FP 10
dx = (img->w << FP) / iw;
dy = (img->h << FP) / ih;
w = SCREEN_WIDTH;
if (w > iw) w = iw;
h = SCREEN_HEIGHT;
if (h > ih) h = ih;
for (y = 0; y < h; y++) {
addr = &((unsigned int *)img->data)[img->w * ((y * dy) >> FP)];
for (x = 0, fp_x = 0; x < w ; x++, fp_x += dx) {
pixel = addr[fp_x >> FP];
gDrawPixel16(screen, sx+x, sy+y, PIXEL32_R(pixel), PIXEL32_G(pixel), PIXEL32_B(pixel));
}
}
}
gBITMAP *gStretchBitmap(gBITMAP *img, unsigned int iw, unsigned int ih) {
int dx, dy;
int x , y, fp_x, fx, w, h;
unsigned int *srcCurLineAddr, *srcPrevLineAddr, *srcNextLineAddr;
unsigned int *dstAddr;
unsigned int pixel, r, g, b, a, div;
gBITMAP *toBmp;
if ((!img) || (!img->data)) return NULL; // sanity check
if ((img->bpp != 32) || (img->bpp != 32)) return NULL; // supported BPPs
toBmp = gCreateBitmap(iw, ih, img->bpp);
if (!toBmp) return NULL;
#define FP 10
dx = (img->w << FP) / iw;
dy = (img->h << FP) / ih;
w = img->w;
if (w > iw) w = iw;
h = img->h;
if (h > ih) h = ih;
for (y = 0; y < ih; y++) {
// Current line
srcCurLineAddr = &((unsigned int *)img->data)[img->w * ((y * dy) >> FP)];
// Previous line
if (y == 0) srcPrevLineAddr = NULL;
else srcPrevLineAddr = &((unsigned int *)img->data)[img->w * (((y * dy) - 1) >> FP)];
// Next line
if ((((y * dy) + 1) >> FP) >= img->h) srcNextLineAddr = NULL;
else srcNextLineAddr = &((unsigned int *)img->data)[img->w * (((y * dy) + 1) >> FP)];
// Destination
dstAddr = &((unsigned int*)toBmp->data)[toBmp->w * y];
for (x = 0, fp_x = 0; x < iw ; x++, fp_x += dx) {
// Current line
div = 4;
fx = fp_x >> FP;
pixel = srcCurLineAddr[fx];
r = PIXEL32_R(pixel) * 4;
g = PIXEL32_G(pixel) * 4;
b = PIXEL32_B(pixel) * 4;
a = PIXEL32_A(pixel) * 4;
#define INCLUDE_PIXEL(p) \
{\
pixel = p;\
r += PIXEL32_R(pixel);\
g += PIXEL32_G(pixel);\
b += PIXEL32_B(pixel);\
a += PIXEL32_A(pixel);\
div++;\
}
if (fx > 0) INCLUDE_PIXEL(srcCurLineAddr[fx - 1]);
if ((fx + 1) < img->w) INCLUDE_PIXEL(srcCurLineAddr[fx + 1]);
// Previous line
if (srcPrevLineAddr) {
INCLUDE_PIXEL(srcPrevLineAddr[fx]);
if (fx > 0) INCLUDE_PIXEL(srcPrevLineAddr[fx - 1]);
if ((fx + 1) < img->w) INCLUDE_PIXEL(srcPrevLineAddr[fx + 1]);
}
// Next line
if (srcNextLineAddr) {
INCLUDE_PIXEL(srcNextLineAddr[fx]);
if (fx > 0) INCLUDE_PIXEL(srcNextLineAddr[fx - 1]);
if ((fx + 1) < img->w) INCLUDE_PIXEL(srcNextLineAddr[fx + 1]);
}
#undef INCLUDE_PIXEL
dstAddr[x] = RGB32(r/div, g/div, b/div, a/div);
}
}
return toBmp;
}
void gClearScreen(unsigned short *screen, unsigned short color) {
int x, y;
for (y = 0; y < SCREEN_HEIGHT; y++)
for (x = 0; x < SCREEN_WIDTH; x++) {
screen[y * SCREEN_WIDTH + x] = color;
}
}
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