75 lines
2.8 KiB
C
75 lines
2.8 KiB
C
#include "cell.h"
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#include <string.h>
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#include <stdlib.h>
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#include "stb_image_common.h"
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// GIF decoding via stb_image - handles animated GIFs
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// Returns an object with:
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// .width, .height - dimensions
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// .frames - array of frame objects, each with:
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// .width, .height, .format, .pitch, .pixels, .depth, .hdr
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// .duration - frame duration in milliseconds (for animated GIFs)
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// .frame_count - number of frames
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JSValue js_gif_decode(JSContext *js, JSValue this_val, int argc, JSValueConst *argv)
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{
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size_t len;
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void *raw = js_get_blob_data(js, &len, argv[0]);
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if (raw == NULL) return JS_EXCEPTION;
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if (!raw) return JS_ThrowReferenceError(js, "could not get GIF data from blob");
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int n, width, height, frames_count;
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int *delays = NULL;
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void *data = stbi_load_gif_from_memory(raw, len, &delays, &width, &height, &frames_count, &n, 4);
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if (!data)
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return JS_ThrowReferenceError(js, "failed to decode GIF: %s", stbi_failure_reason());
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if (width <= 0 || height <= 0) {
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stbi_image_free(data);
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if (delays) stbi_image_free(delays);
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return JS_ThrowReferenceError(js, "decoded GIF has invalid size: %dx%d", width, height);
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}
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int pitch = width * 4;
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size_t frame_size = pitch * height;
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JS_FRAME(js);
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JS_ROOT(frames_array, JS_NewArray(js));
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for (int i = 0; i < frames_count; i++) {
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JS_ROOT(frame, JS_NewObject(js));
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JS_SetPropertyStr(js, frame.val, "width", JS_NewInt32(js, width));
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JS_SetPropertyStr(js, frame.val, "height", JS_NewInt32(js, height));
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JS_SetPropertyStr(js, frame.val, "format", JS_NewString(js, "rgba32"));
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JS_SetPropertyStr(js, frame.val, "pitch", JS_NewInt32(js, pitch));
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void *frame_pixels = (unsigned char*)data + (frame_size * i);
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JS_SetPropertyStr(js, frame.val, "pixels", js_new_blob_stoned_copy(js, frame_pixels, frame_size));
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JS_SetPropertyStr(js, frame.val, "depth", JS_NewInt32(js, 8));
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JS_SetPropertyStr(js, frame.val, "hdr", JS_NewBool(js, 0));
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// Add duration in milliseconds (delays are in centiseconds, i.e. 1/100th of a second)
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int duration_ms = delays ? delays[i] * 10 : 100;
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JS_SetPropertyStr(js, frame.val, "duration", JS_NewInt32(js, duration_ms));
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JS_SetPropertyNumber(js, frames_array.val, i, frame.val);
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}
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// Create result object
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JS_ROOT(result, JS_NewObject(js));
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JS_SetPropertyStr(js, result.val, "width", JS_NewInt32(js, width));
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JS_SetPropertyStr(js, result.val, "height", JS_NewInt32(js, height));
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JS_SetPropertyStr(js, result.val, "frames", frames_array.val);
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JS_SetPropertyStr(js, result.val, "frame_count", JS_NewInt32(js, frames_count));
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stbi_image_free(data);
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if (delays) stbi_image_free(delays);
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JS_RETURN(result.val);
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}
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static const JSCFunctionListEntry js_gif_funcs[] = {
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MIST_FUNC_DEF(gif, decode, 1)
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};
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CELL_USE_FUNCS(js_gif_funcs)
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