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#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include "cgif.h"
#define WIDTH 20
#define HEIGHT 20
/* Small helper functions to initialize GIF- and frame-configuration */
static void initGIFConfig(CGIF_Config* pConfig, char* path, uint16_t width, uint16_t height, uint8_t* pPalette, uint16_t numColors) {
memset(pConfig, 0, sizeof(CGIF_Config));
pConfig->width = width;
pConfig->height = height;
pConfig->pGlobalPalette = pPalette;
pConfig->numGlobalPaletteEntries = numColors;
pConfig->path = path;
pConfig->attrFlags = CGIF_ATTR_IS_ANIMATED;
}
static void initFrameConfig(CGIF_FrameConfig* pConfig, uint8_t* pImageData, uint16_t delay) {
memset(pConfig, 0, sizeof(CGIF_FrameConfig));
pConfig->delay = delay;
pConfig->pImageData = pImageData;
pConfig->genFlags = CGIF_FRAME_GEN_USE_TRANSPARENCY | CGIF_FRAME_GEN_USE_DIFF_WINDOW; // use optimizations
}
/* This is a test that creates a GIF-animation with alternating colors. */
int main(void) {
CGIF* pGIF; // struct containing the GIF
CGIF_Config gConfig; // global configuration parameters for the GIF
CGIF_FrameConfig fConfig; // configuration parameters for a frame
uint8_t* pImageData; // image data (an array of color-indices)
cgif_result r;
uint8_t aPalette[] = {0xFF, 0x00, 0x00, // red
0x00, 0xFF, 0x00, // green
0x00, 0x00, 0xFF}; // blue
uint8_t numColors = 3; // number of colors in aPalette (up to 256 possible)
// initialize the GIF-configuration and create a new GIF
initGIFConfig(&gConfig, "switchpattern.gif", WIDTH, HEIGHT, aPalette, numColors);
pGIF = cgif_newgif(&gConfig);
if(pGIF == NULL) {
fputs("failed to create new GIF via cgif_newgif()\n", stderr);
return 1;
}
// create image frames and add them to GIF
pImageData = malloc(WIDTH * HEIGHT); // allocate memory for image data
memset(pImageData, 0, WIDTH * HEIGHT);
initFrameConfig(&fConfig, pImageData, 20); // initialize the frame-configuration
r = cgif_addframe(pGIF, &fConfig); // append the new frame
memset(pImageData, 1, WIDTH * HEIGHT);
r = cgif_addframe(pGIF, &fConfig); // append the new frame
memset(pImageData, 0, WIDTH * HEIGHT);
r = cgif_addframe(pGIF, &fConfig); // append the new frame
memset(pImageData, 1, WIDTH * HEIGHT);
r = cgif_addframe(pGIF, &fConfig); // append the new frame
memset(pImageData, 2, WIDTH * HEIGHT);
r = cgif_addframe(pGIF, &fConfig); // append the new frame
memset(pImageData, 1, WIDTH * HEIGHT);
r = cgif_addframe(pGIF, &fConfig); // append the new frame
memset(pImageData, 2, WIDTH * HEIGHT);
r = cgif_addframe(pGIF, &fConfig); // append the new frame
free(pImageData); // free image data when all frames were added
// close created GIF-file and free allocated space
r = cgif_close(pGIF);
// check for errors
if(r != CGIF_OK) {
fprintf(stderr, "failed to create GIF. error code: %d\n", r);
return 2;
}
return 0;
}
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