119 lines
3.9 KiB
C
119 lines
3.9 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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// JPEG decoding
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JSValue js_jpg_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 JPEG data from blob");
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int n, width, height;
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void *data = stbi_load_from_memory(raw, len, &width, &height, &n, 4);
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if (!data)
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return JS_ThrowReferenceError(js, "failed to decode JPEG: %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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return JS_ThrowReferenceError(js, "decoded JPEG 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 pixels_size = pitch * height;
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JSValue obj = JS_NewObject(js);
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JS_SetPropertyStr(js, obj, "width", JS_NewInt32(js, width));
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JS_SetPropertyStr(js, obj, "height", JS_NewInt32(js, height));
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JS_SetPropertyStr(js, obj, "format", JS_NewString(js, "rgba32"));
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JS_SetPropertyStr(js, obj, "pitch", JS_NewInt32(js, pitch));
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JS_SetPropertyStr(js, obj, "pixels", js_new_blob_stoned_copy(js, data, pixels_size));
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JS_SetPropertyStr(js, obj, "depth", JS_NewInt32(js, 8));
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JS_SetPropertyStr(js, obj, "hdr", JS_NewBool(js, 0));
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stbi_image_free(data);
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return obj;
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}
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// JPEG encoding
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JSValue js_jpg_encode(JSContext *js, JSValue this_val, int argc, JSValueConst *argv)
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{
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if (argc < 1)
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return JS_ThrowTypeError(js, "jpg.encode requires an image object");
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JSValue width_val = JS_GetPropertyStr(js, argv[0], "width");
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JSValue height_val = JS_GetPropertyStr(js, argv[0], "height");
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if (JS_IsNull(width_val) || JS_IsNull(height_val)) {
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JS_FreeValue(js, width_val);
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JS_FreeValue(js, height_val);
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return JS_ThrowTypeError(js, "jpg.encode requires width and height properties");
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}
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int width, height;
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if (JS_ToInt32(js, &width, width_val) < 0 || JS_ToInt32(js, &height, height_val) < 0) {
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JS_FreeValue(js, width_val);
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JS_FreeValue(js, height_val);
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return JS_ThrowTypeError(js, "width and height must be numbers");
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}
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JS_FreeValue(js, width_val);
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JS_FreeValue(js, height_val);
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if (width < 1 || height < 1)
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return JS_ThrowRangeError(js, "width and height must be at least 1");
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JSValue pixels_val = JS_GetPropertyStr(js, argv[0], "pixels");
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size_t pixel_len;
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void *pixel_data = js_get_blob_data(js, &pixel_len, pixels_val);
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JS_FreeValue(js, pixels_val);
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if (pixel_data == NULL) return JS_EXCEPTION;
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if (!pixel_data) return JS_ThrowTypeError(js, "pixels blob has no data");
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size_t required_size = width * height * 4;
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if (pixel_len < required_size)
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return JS_ThrowRangeError(js, "pixels buffer too small (need %zu, got %zu)", required_size, pixel_len);
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// Quality: default 90, can be overridden via options
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int quality = 90;
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if (argc > 1 && JS_IsObject(argv[1])) {
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JSValue qv = JS_GetPropertyStr(js, argv[1], "quality");
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if (!JS_IsNull(qv)) {
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int qtmp;
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if (JS_ToInt32(js, &qtmp, qv) == 0) {
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if (qtmp < 1) qtmp = 1;
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if (qtmp > 100) qtmp = 100;
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quality = qtmp;
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}
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}
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JS_FreeValue(js, qv);
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}
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stbi_mem_buf buf = {0};
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stbi_write_jpg_to_func(stbi_mem_write, &buf, width, height, 4, pixel_data, quality);
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if (!buf.data || buf.size == 0) {
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if (buf.data) free(buf.data);
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return JS_ThrowInternalError(js, "failed to encode JPEG");
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}
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JSValue result = JS_NewObject(js);
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JS_SetPropertyStr(js, result, "width", JS_NewInt32(js, width));
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JS_SetPropertyStr(js, result, "height", JS_NewInt32(js, height));
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JS_SetPropertyStr(js, result, "format", JS_NewString(js, "jpg"));
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JS_SetPropertyStr(js, result, "pixels", js_new_blob_stoned_copy(js, buf.data, buf.size));
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free(buf.data);
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return result;
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}
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static const JSCFunctionListEntry js_jpg_funcs[] = {
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MIST_FUNC_DEF(jpg, decode, 1),
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MIST_FUNC_DEF(jpg, encode, 2)
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};
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CELL_USE_FUNCS(js_jpg_funcs)
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