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Added helper functions

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This commit is contained in:
Justin Ethier 2016-04-19 03:23:51 -04:00
parent f3500b1962
commit e78eecbd50
1 changed files with 25 additions and 40 deletions
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65
examples/game-of-life-png/write-png.c
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@ -17,18 +17,10 @@ typedef struct _RGBBitmap {
RGBPixel *pixels;
size_t width;
size_t height;
size_t bytewidth;
uint8_t bytes_per_pixel;
} RGBBitmap;
/* Returns pixel of bitmap at given point. */
//#define RGBPixelAtPoint(image, x, y) \
// *(((image)->pixels) + (((image)->bytewidth * (y)) \
// + ((x) * (image)->bytes_per_pixel)))
//
//#define RGBBufferAtPoint(image, x, y) \
// (((image)->pixels) + (((image)->bytewidth * (y)) \
// + ((x) * (image)->bytes_per_pixel)))
#define RGBPixelAtPoint(image, x, y) \
*(((image)->pixels) + (((image)->width * (y)) \
+ ((x))))
@ -86,7 +78,7 @@ int save_png_to_file(RGBBitmap *bitmap, const char *path)
bytes_per_row = bitmap->width * bitmap->bytes_per_pixel;
row_pointers = png_malloc(png_ptr, bitmap->height * sizeof(png_byte *));
for (y = 0; y < bitmap->height; ++y) {
uint8_t *row = png_malloc(png_ptr, sizeof(uint8_t) * bytes_per_row); //bitmap->bytes_per_pixel * bitmap->width);
uint8_t *row = png_malloc(png_ptr, sizeof(uint8_t) * bytes_per_row);
row_pointers[y] = (png_byte *)row;
for (x = 0; x < bitmap->width; ++x) {
RGBPixel color = RGBPixelAtPoint(bitmap, x, y);
@ -113,47 +105,40 @@ int save_png_to_file(RGBBitmap *bitmap, const char *path)
return 0;
}
int bitmap_init(RGBBitmap *img, int width, int height)
{
img->width = width;
img->height = height;
img->bytes_per_pixel = 3;
img->pixels = calloc(1, sizeof(RGBPixel) * img->width * img->height);
return 0;
}
void bitmap_set(RGBBitmap *img, int x, int y, int r, int g, int b)
{
RGBPixel *pixel = RGBBufferAtPoint(img, x, y);
pixel->red = r;
pixel->green = g;
pixel->blue = b;
}
int main()
{
const char path[] = "test.png";
int status = 0, x, y;
RGBBitmap img;
RGBPixel *pixel;
img.width = 100;
img.height = 100;
img.bytewidth = img.width; // ????
img.bytes_per_pixel = 3;
img.pixels = calloc(1, sizeof(RGBPixel) * img.width * img.height);
bitmap_init(&img, 100, 100);
for (y = 0; y < img.height; y++) {
for (x = 0; x < img.height; x++) {
pixel = RGBBufferAtPoint(&img, x, y);
pixel->red = 255;
pixel->green = 255;
pixel->blue = 255;
bitmap_set(&img, x, y, 255, 255, 255);
}
}
pixel = RGBBufferAtPoint(&img, 50, 50);
pixel->red = 0;
pixel->green = 0;
pixel->blue = 255;
pixel = RGBBufferAtPoint(&img, 0, 0);
pixel->red = 0;
pixel->green = 0;
pixel->blue = 255;
pixel = RGBBufferAtPoint(&img, 99, 0);
pixel->red = 0;
pixel->green = 0;
pixel->blue = 255;
pixel = RGBBufferAtPoint(&img, 0, 99);
pixel->red = 0;
pixel->green = 0;
pixel->blue = 255;
pixel = RGBBufferAtPoint(&img, 99, 99);
pixel->red = 0;
pixel->green = 0;
pixel->blue = 255;
bitmap_set(&img, 50, 50, 0, 0, 255);
bitmap_set(&img, 0, 0, 0, 0, 255);
bitmap_set(&img, 99, 0, 0, 0, 255);
bitmap_set(&img, 0, 99, 0, 0, 255);
bitmap_set(&img, 99, 99, 0, 0, 255);
status = save_png_to_file(&img, path);
if (!status){