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Merge pull request #50 from dloebl/interlaced
Add support for interlaced encoding
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| #include <stdlib.h> | ||
| #include <stdint.h> | ||
| #include <string.h> | ||
| #include <stdio.h> | ||
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| #include "cgif.h" | ||
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| #define WIDTH 40 | ||
| #define HEIGHT 40 | ||
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| /* 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->attrFlags = CGIF_FRAME_ATTR_INTERLACED; | ||
| pConfig->genFlags = CGIF_FRAME_GEN_USE_TRANSPARENCY | CGIF_FRAME_GEN_USE_DIFF_WINDOW; // use optimizations | ||
| } | ||
|
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| /* This is an example code that creates a GIF-animation with a moving snake. */ | ||
| 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) | ||
| int x,y,x1,y1; // position of snake beginning and end | ||
| 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) | ||
| int numFrames = 37*4; // number of frames in the video | ||
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| // initialize the GIF-configuration and create a new GIF | ||
| initGIFConfig(&gConfig, "animated_interlaced.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; | ||
| } | ||
|
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| // create image frames and add them to GIF | ||
| pImageData = malloc(WIDTH * HEIGHT); // allocate memory for image data | ||
| memset(pImageData, 0, WIDTH * HEIGHT); // set the background color to 1st color in palette | ||
| x = 1; // set start position... | ||
| y = 1; | ||
| x1 = 1; | ||
| y1 = 15; | ||
| for (int i = 1; i < 15; ++i) { // draw the snake | ||
| pImageData[1 + i*WIDTH] = 1; | ||
| } | ||
| for (int f = 0; f < numFrames; ++f) { // loop over all frames | ||
| pImageData[x + y*WIDTH] = 0; // remove end of the snake | ||
| pImageData[x1 + y1*WIDTH] = 1; // moving pixel at snake head | ||
| if (x==1 && y<WIDTH-2) { // rules for moving the snake... | ||
| y++; | ||
| } else if (y==WIDTH-2 && x<WIDTH-2){ | ||
| x++; | ||
| } else if (x==WIDTH-2 && y>1){ | ||
| y--; | ||
| } else{ | ||
| x--; | ||
| } | ||
| if (x1==1 && y1<WIDTH-2) { | ||
| y1++; | ||
| } else if (y1==WIDTH-2 && x1<WIDTH-2){ | ||
| x1++; | ||
| } else if (x1==WIDTH-2 && y1>1){ | ||
| y1--; | ||
| } else{ | ||
| x1--; | ||
| } | ||
| initFrameConfig(&fConfig, pImageData, 5); // initialize the frame-configuration | ||
| r = cgif_addframe(pGIF, &fConfig); // append the new frame | ||
| if(r != CGIF_OK) { | ||
| break; | ||
| } | ||
| } | ||
| free(pImageData); // free image data when all frames are added | ||
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| // close created GIF-file and free allocated space | ||
| r = cgif_close(pGIF); | ||
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| // 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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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| #include <stdlib.h> | ||
| #include <stdint.h> | ||
| #include <string.h> | ||
| #include <stdio.h> | ||
|
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| #include "cgif.h" | ||
|
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| #define WIDTH 700 | ||
| #define HEIGHT 320 | ||
|
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| static uint64_t seed; | ||
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| int psdrand(void) { | ||
| // simple pseudo random function from musl libc | ||
| seed = 6364136223846793005ULL * seed + 1; | ||
| return seed >> 33; | ||
| } | ||
|
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| int main(void) { | ||
| CGIF* pGIF; | ||
| CGIF_Config gConfig; | ||
| CGIF_FrameConfig fConfig; | ||
| uint8_t* pImageData; | ||
| cgif_result r; | ||
| uint8_t aPalette[6 * 3]; | ||
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| seed = 42; | ||
| for(int i = 0; i < 6; ++i) { | ||
| aPalette[i * 3] = psdrand() % 256; | ||
| aPalette[i * 3 + 1] = psdrand() % 256; | ||
| aPalette[i * 3 + 2] = psdrand() % 256; | ||
| } | ||
| memset(&gConfig, 0, sizeof(CGIF_Config)); | ||
| memset(&fConfig, 0, sizeof(CGIF_FrameConfig)); | ||
| gConfig.width = WIDTH; | ||
| gConfig.height = HEIGHT; | ||
| gConfig.pGlobalPalette = aPalette; | ||
| gConfig.numGlobalPaletteEntries = 6; | ||
| gConfig.path = "noise6_interlaced.gif"; | ||
| // | ||
| // create new GIF | ||
| pGIF = cgif_newgif(&gConfig); | ||
| if(pGIF == NULL) { | ||
| fputs("failed to create new GIF via cgif_newgif()\n", stderr); | ||
| return 1; | ||
| } | ||
| // | ||
| // add frames to GIF | ||
| pImageData = malloc(WIDTH * HEIGHT); | ||
| for(int i = 0; i < WIDTH * HEIGHT; ++i) pImageData[i] = psdrand() % 6; | ||
| fConfig.pImageData = pImageData; | ||
| fConfig.attrFlags = CGIF_FRAME_ATTR_INTERLACED; | ||
| r = cgif_addframe(pGIF, &fConfig); | ||
| free(pImageData); | ||
| // | ||
| // write GIF to file | ||
| r = cgif_close(pGIF); // free allocated space at the end of the session | ||
|
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| // 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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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| #include <stdlib.h> | ||
| #include <stdint.h> | ||
| #include <string.h> | ||
| #include <stdio.h> | ||
|
|
||
| #include "cgif.h" | ||
|
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| #define WIDTH 1000 | ||
| #define HEIGHT 1000 | ||
|
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| /* horizontal stripe pattern with 1pixel linewidth, to test interlaced mode */ | ||
| int main(void) { | ||
| CGIF* pGIF; | ||
| CGIF_Config gConfig; | ||
| CGIF_FrameConfig fConfig; | ||
| uint8_t* pImageData; | ||
| cgif_result r; | ||
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| uint8_t aPalette[] = { | ||
| 0x00, 0xFF, 0x00, // green | ||
| 0xFF, 0x00, 0xFF, // purple | ||
| }; | ||
| memset(&gConfig, 0, sizeof(CGIF_Config)); | ||
| memset(&fConfig, 0, sizeof(CGIF_FrameConfig)); | ||
| gConfig.width = WIDTH; | ||
| gConfig.height = HEIGHT; | ||
| gConfig.pGlobalPalette = aPalette; | ||
| gConfig.numGlobalPaletteEntries = 2; | ||
| gConfig.path = "stripe_pattern_interlaced.gif"; | ||
| // | ||
| // create new GIF | ||
| pGIF = cgif_newgif(&gConfig); | ||
| if(pGIF == NULL) { | ||
| fputs("failed to create new GIF via cgif_newgif()\n", stderr); | ||
| return 1; | ||
| } | ||
| // | ||
| // add frames to GIF | ||
| pImageData = malloc(WIDTH * HEIGHT); | ||
| for(int i = 0; i < HEIGHT; ++i){ | ||
| memset(pImageData + i*WIDTH, i % 2, WIDTH); | ||
| } | ||
| fConfig.pImageData = pImageData; | ||
| fConfig.attrFlags = CGIF_FRAME_ATTR_INTERLACED; | ||
| r = cgif_addframe(pGIF, &fConfig); | ||
| free(pImageData); | ||
| // | ||
| // write GIF to file | ||
| r = cgif_close(pGIF); // free allocated space at the end of the session | ||
|
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| // 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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