Difference between revisions of "Targa.c"
(put test at bottom - no function prototypes) |
(need int on each parameter) |
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| Line 6: | Line 6: | ||
// Create a new targa image in memory | // Create a new targa image in memory | ||
| − | char* targa(int width, height) { | + | char* targa(int width, int height) { |
char* image = malloc(18+width*height*4); | char* image = malloc(18+width*height*4); | ||
image[12] = width & 0xff00 >> 8; | image[12] = width & 0xff00 >> 8; | ||
| Line 17: | Line 17: | ||
} | } | ||
| − | char* getOffset(char* image, int x,y) { | + | char* getOffset(char* image, int x, int y) { |
int width = (int)((image[12]<<8)+image[13]); | int width = (int)((image[12]<<8)+image[13]); | ||
return image+18+4*(x+y*width); | return image+18+4*(x+y*width); | ||
} | } | ||
| − | int getPixel(char* image, int x,y) { | + | int getPixel(char* image, int x, int y) { |
return *getOffset(image,x,y); | return *getOffset(image,x,y); | ||
} | } | ||
| − | void setPixel(char* image, int x,y,colour) { | + | void setPixel(char* image, int x, int y, int colour) { |
int i, col[3], a = colour >> 24; | int i, col[3], a = colour >> 24; | ||
int col[0] = (colour & 0xff0000) >> 16; | int col[0] = (colour & 0xff0000) >> 16; | ||
| Line 36: | Line 36: | ||
} | } | ||
| − | void fillRect(char* image, int x1,y1,x2,y2,colour) { | + | void fillRect(char* image, int x1, int y1, int x2 int ,y2, int colour) { |
int x,y; | int x,y; | ||
for (y=y1; y<y2; y++) | for (y=y1; y<y2; y++) | ||
Revision as of 11:36, 3 July 2006
// Licenced under LGPL: www.gnu.org/copyleft/lesser.html
- include <stdlib.h>
- include <stdio.h>
- include <string.h>
main() {
// Create a new targa image in memory char* targa(int width, int height) { char* image = malloc(18+width*height*4); image[12] = width & 0xff00 >> 8; image[13] = width & 0xff; image[14] = height & 0xff00 >> 8; image[15] = height & 0xff; image[16] = 8; image[17] = ' '; return image; }
char* getOffset(char* image, int x, int y) { int width = (int)((image[12]<<8)+image[13]); return image+18+4*(x+y*width); }
int getPixel(char* image, int x, int y) { return *getOffset(image,x,y); }
void setPixel(char* image, int x, int y, int colour) { int i, col[3], a = colour >> 24; int col[0] = (colour & 0xff0000) >> 16; int col[1] = (colour & 0xff00) >> 8; int col[2] = colour & 0xff; char* pix = getOffset(image,x,y); for (i=1; i<4; i++) pix[i] = (char)(col[i]*a/255+pix[i]*(255-a)/255); }
void fillRect(char* image, int x1, int y1, int x2 int ,y2, int colour) { int x,y; for (y=y1; y<y2; y++) for (x=x1; x<x2; x++) setPixel(image,x,y,colour); } }
char* image = targa(100,200); fillRect(image,10,20,30,40,0xff0000ff); fillRect(image,20,30,40,50,0x80ff0000);
