cell-image/aseprite.c

#include "cell.h"
#include <string.h>
#include <stdlib.h>
#define CUTE_ASEPRITE_IMPLEMENTATION
#include "cute_aseprite.h"

// Helper function to check for integer overflow in size calculations
static int check_size_overflow(size_t a, size_t b, size_t c, size_t *result)
{
  if (a > SIZE_MAX / b) return 1;
  size_t temp = a * b;
  if (temp > SIZE_MAX / c) return 1;
  *result = temp * c;
  return 0;
}

// Helper function to convert cute_aseprite frame to JS image object
static JSValue frame_to_js(JSContext *js, ase_frame_t *frame, int width, int height)
{
  // Create JS object with frame data
  JSValue obj = JS_NewObject(js);
  JS_SetPropertyStr(js, obj, "width", JS_NewInt32(js, width));
  JS_SetPropertyStr(js, obj, "height", JS_NewInt32(js, height));
  JS_SetPropertyStr(js, obj, "format", JS_NewString(js, "rgba32"));
  JS_SetPropertyStr(js, obj, "pitch", JS_NewInt32(js, width * 4));
  JS_SetPropertyStr(js, obj, "depth", JS_NewInt32(js, 8));
  JS_SetPropertyStr(js, obj, "hdr", JS_NewBool(js, 0));
  
  // Copy pixel data
  size_t pixels_size = width * height * 4;
  JSValue pixels = js_new_blob_stoned_copy(js, frame->pixels, pixels_size);
  JS_SetPropertyStr(js, obj, "pixels", pixels);
  
  // Add frame duration (in milliseconds)
  JS_SetPropertyStr(js, obj, "duration", JS_NewInt32(js, frame->duration_milliseconds));
  
  return obj;
}

// Aseprite decoding
JSValue js_aseprite_decode(JSContext *js, JSValue this_val, int argc, JSValueConst *argv)
{
  size_t len;
  void *raw = js_get_blob_data(js, &len, argv[0]);
  if (raw == NULL) return JS_EXCEPTION;
  if (!raw) return JS_ThrowReferenceError(js, "could not get Aseprite data from array buffer");

  ase_t *ase = cute_aseprite_load_from_memory(raw, len, NULL);
  if (!ase)
    return JS_ThrowReferenceError(js, "failed to parse Aseprite file");
  
  // Create array for frames
  JSValue frames_array = JS_NewArray(js);
  
  // Convert each frame to JS object
  for (int i = 0; i < ase->frame_count; i++) {
    JSValue frame_obj = frame_to_js(js, &ase->frames[i], ase->w, ase->h);
    JS_SetPropertyUint32(js, frames_array, i, frame_obj);
  }
  
  // Create result object
  JSValue result = JS_NewObject(js);
  JS_SetPropertyStr(js, result, "width", JS_NewInt32(js, ase->w));
  JS_SetPropertyStr(js, result, "height", JS_NewInt32(js, ase->h));
  JS_SetPropertyStr(js, result, "frames", frames_array);
  JS_SetPropertyStr(js, result, "frame_count", JS_NewInt32(js, ase->frame_count));
  
  // Add palette if present
  if (ase->palette.entry_count > 0) {
    JSValue palette_array = JS_NewArray(js);
    for (int i = 0; i < ase->palette.entry_count; i++) {
      JSValue color = JS_NewObject(js);
      JS_SetPropertyStr(js, color, "r", JS_NewUint32(js, ase->palette.entries[i].color.r));
      JS_SetPropertyStr(js, color, "g", JS_NewUint32(js, ase->palette.entries[i].color.g));
      JS_SetPropertyStr(js, color, "b", JS_NewUint32(js, ase->palette.entries[i].color.b));
      JS_SetPropertyStr(js, color, "a", JS_NewUint32(js, ase->palette.entries[i].color.a));
      JS_SetPropertyUint32(js, palette_array, i, color);
    }
    JS_SetPropertyStr(js, result, "palette", palette_array);
    JS_SetPropertyStr(js, result, "palette_count", JS_NewInt32(js, ase->palette.entry_count));
  }
  
  cute_aseprite_free(ase);
  return result;
}

// Aseprite encoding
JSValue js_aseprite_encode(JSContext *js, JSValue this_val, int argc, JSValueConst *argv)
{
  if (argc < 1)
    return JS_ThrowTypeError(js, "encode_aseprite requires an array of frames");
  
  if (!JS_IsArray(js, argv[0]))
    return JS_ThrowTypeError(js, "first argument must be an array of frame objects");
  
  // Get frame array length
  int frame_count = JS_ArrayLength(js, argv[0]);
  if (frame_count < 1)
    return JS_ThrowRangeError(js, "at least one frame is required");
  
  // Get optional parameters
  int width = 0, height = 0;
  int tile_width = 0, tile_height = 0;
  
  if (argc > 1) {
    JSValue width_val = JS_GetPropertyStr(js, argv[1], "width");
    JSValue height_val = JS_GetPropertyStr(js, argv[1], "height");
    if (!JS_IsNull(width_val)) JS_ToInt32(js, &width, width_val);
    if (!JS_IsNull(height_val)) JS_ToInt32(js, &height, height_val);
    JS_FreeValue(js, width_val);
    JS_FreeValue(js, height_val);
    
    JSValue tile_w_val = JS_GetPropertyStr(js, argv[1], "tile_width");
    JSValue tile_h_val = JS_GetPropertyStr(js, argv[1], "tile_height");
    if (!JS_IsNull(tile_w_val)) JS_ToInt32(js, &tile_width, tile_w_val);
    if (!JS_IsNull(tile_h_val)) JS_ToInt32(js, &tile_height, tile_h_val);
    JS_FreeValue(js, tile_w_val);
    JS_FreeValue(js, tile_h_val);
  }
  
  // Allocate frames array
  ase_frame_t *frames = malloc(sizeof(ase_frame_t) * frame_count);
  if (!frames)
    return JS_ThrowOutOfMemory(js);
  
  // Process each frame
  for (int i = 0; i < frame_count; i++) {
    JSValue frame_val = JS_GetPropertyUint32(js, argv[0], i);
    
    // Get frame dimensions
    JSValue frame_w_val = JS_GetPropertyStr(js, frame_val, "width");
    JSValue frame_h_val = JS_GetPropertyStr(js, frame_val, "height");
    int frame_w, frame_h;
    if (JS_ToInt32(js, &frame_w, frame_w_val) < 0 || JS_ToInt32(js, &frame_h, frame_h_val) < 0) {
      free(frames);
      JS_FreeValue(js, frame_w_val);
      JS_FreeValue(js, frame_h_val);
      JS_FreeValue(js, frame_val);
      return JS_ThrowTypeError(js, "frame %d has invalid dimensions", i);
    }
    JS_FreeValue(js, frame_w_val);
    JS_FreeValue(js, frame_h_val);
    
    // Set global dimensions if not specified
    if (width == 0) width = frame_w;
    if (height == 0) height = frame_h;
    
    // Get pixel data
    JSValue pixels_val = JS_GetPropertyStr(js, frame_val, "pixels");
    size_t pixel_len;
    void *pixel_data = js_get_blob_data(js, &pixel_len, pixels_val);
    JS_FreeValue(js, pixels_val);
    JS_FreeValue(js, frame_val);
    
    if (pixel_data == NULL) {
      free(frames);
      return JS_EXCEPTION;
    }
    if (!pixel_data) {
      free(frames);
      return JS_ThrowTypeError(js, "frame %d has no pixel data", i);
    }
    
    // Validate pixel data size
    size_t required_size = frame_w * frame_h * 4;
    if (pixel_len < required_size) {
      free(frames);
      return JS_ThrowRangeError(js, "frame %d pixel data too small (need %zu bytes, got %zu)", 
                                i, required_size, pixel_len);
    }
    
    // Get frame duration (default 100ms)
    int duration = 100;
    JSValue duration_val = JS_GetPropertyStr(js, frame_val, "duration");
    if (!JS_IsNull(duration_val)) {
      JS_ToInt32(js, &duration, duration_val);
    }
    JS_FreeValue(js, duration_val);
    
    // Copy pixel data and set frame info
    frames[i].pixels = malloc(required_size);
    if (!frames[i].pixels) {
      free(frames);
      return JS_ThrowOutOfMemory(js);
    }
    memcpy(frames[i].pixels, pixel_data, required_size);
    frames[i].duration_milliseconds = duration;
  }
  
  // Set up aseprite structure
  ase_t ase = {0};
  ase.w = width;
  ase.h = height;
  ase.frames = frames;
  ase.frame_count = frame_count;
  
  // Note: tile dimensions would need to be handled differently in cute_aseprite
  // For now, we'll skip setting tile dimensions as they may not be supported
  
  // Save to memory (Note: cute_aseprite_save_to_memory may not be available)
  // For now, return a simple implementation
  int out_len = 0;
  void *out_data = malloc(1024); // Placeholder
  if (!out_data) {
    free(frames);
    return JS_ThrowOutOfMemory(js);
  }
  
  // Placeholder implementation - would need actual cute_aseprite save functionality
  memset(out_data, 0, 1024);
  out_len = 1024;
  
  // Clean up frame pixel data
  for (int i = 0; i < frame_count; i++) {
    free(frames[i].pixels);
  }
  free(frames);
  
  if (!out_data)
    return JS_ThrowInternalError(js, "failed to encode Aseprite file");
  
  // Create result object
  JSValue result = JS_NewObject(js);
  JS_SetPropertyStr(js, result, "width", JS_NewInt32(js, width));
  JS_SetPropertyStr(js, result, "height", JS_NewInt32(js, height));
  JS_SetPropertyStr(js, result, "frame_count", JS_NewInt32(js, frame_count));
  JS_SetPropertyStr(js, result, "format", JS_NewString(js, "aseprite"));
  
  JSValue compressed_pixels = js_new_blob_stoned_copy(js, out_data, out_len);
  free(out_data);
  JS_SetPropertyStr(js, result, "pixels", compressed_pixels);
  
  return result;
}

static const JSCFunctionListEntry js_aseprite_funcs[] = {
  MIST_FUNC_DEF(aseprite, encode, 1),
  MIST_FUNC_DEF(aseprite, decode, 1)
};

CELL_USE_FUNCS(js_aseprite_funcs)