initial commit, 4.5 stable

thirdparty/thorvg/src/loaders/external_jpg/tvgJpgLoader.cpp

@@ -0,0 +1,164 @@
+/*
+ * Copyright (c) 2021 - 2024 the ThorVG project. All rights reserved.
+
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <memory.h>
+#include <turbojpeg.h>
+#include "tvgJpgLoader.h"
+
+/************************************************************************/
+/* Internal Class Implementation                                        */
+/************************************************************************/
+
+void JpgLoader::clear()
+{
+    if (freeData) free(data);
+    data = nullptr;
+    size = 0;
+    freeData = false;
+}
+
+
+/************************************************************************/
+/* External Class Implementation                                        */
+/************************************************************************/
+
+JpgLoader::JpgLoader() : ImageLoader(FileType::Jpg)
+{
+    jpegDecompressor = tjInitDecompress();
+}
+
+
+JpgLoader::~JpgLoader()
+{
+    clear();
+    tjDestroy(jpegDecompressor);
+
+    //This image is shared with raster engine.
+    tjFree(surface.buf8);
+}
+
+
+bool JpgLoader::open(const string& path)
+{
+#ifdef THORVG_FILE_IO_SUPPORT
+    auto jpegFile = fopen(path.c_str(), "rb");
+    if (!jpegFile) return false;
+
+    auto ret = false;
+
+    //determine size
+    if (fseek(jpegFile, 0, SEEK_END) < 0) goto finalize;
+    if (((size = ftell(jpegFile)) < 1)) goto finalize;
+    if (fseek(jpegFile, 0, SEEK_SET)) goto finalize;
+
+    data = (unsigned char *) malloc(size);
+    if (!data) goto finalize;
+
+    freeData = true;
+
+    if (fread(data, size, 1, jpegFile) < 1) goto failure;
+
+    int width, height, subSample, colorSpace;
+    if (tjDecompressHeader3(jpegDecompressor, data, size, &width, &height, &subSample, &colorSpace) < 0) {
+        TVGERR("JPG LOADER", "%s", tjGetErrorStr());
+        goto failure;
+    }
+
+    w = static_cast<float>(width);
+    h = static_cast<float>(height);
+    ret = true;
+
+    goto finalize;
+
+failure:
+    clear();
+
+finalize:
+    fclose(jpegFile);
+    return ret;
+#else
+    return false;
+#endif
+}
+
+
+bool JpgLoader::open(const char* data, uint32_t size, bool copy)
+{
+    int width, height, subSample, colorSpace;
+    if (tjDecompressHeader3(jpegDecompressor, (unsigned char *) data, size, &width, &height, &subSample, &colorSpace) < 0) return false;
+
+    if (copy) {
+        this->data = (unsigned char *) malloc(size);
+        if (!this->data) return false;
+        memcpy((unsigned char *)this->data, data, size);
+        freeData = true;
+    } else {
+        this->data = (unsigned char *) data;
+        freeData = false;
+    }
+
+    w = static_cast<float>(width);
+    h = static_cast<float>(height);
+    this->size = size;
+
+    return true;
+}
+
+
+bool JpgLoader::read()
+{
+    if (!LoadModule::read()) return true;
+
+    if (w == 0 || h == 0) return false;
+
+    //determine the image format
+    TJPF format;
+    if (ImageLoader::cs == ColorSpace::ARGB8888 || ImageLoader::cs == ColorSpace::ARGB8888S) {
+        format = TJPF_BGRX;
+        surface.cs = ColorSpace::ARGB8888;
+    } else {
+        format = TJPF_RGBX;
+        surface.cs = ColorSpace::ABGR8888;
+    }
+
+    auto image = (unsigned char *)tjAlloc(static_cast<int>(w) * static_cast<int>(h) * tjPixelSize[format]);
+    if (!image) return false;
+
+    //decompress jpg image
+    if (tjDecompress2(jpegDecompressor, data, size, image, static_cast<int>(w), 0, static_cast<int>(h), format, 0) < 0) {
+        TVGERR("JPG LOADER", "%s", tjGetErrorStr());
+        tjFree(image);
+        image = nullptr;
+        return false;
+    }
+
+    //setup the surface
+    surface.buf8 = image;
+    surface.stride = w;
+    surface.w = w;
+    surface.h = h;
+    surface.channelSize = sizeof(uint32_t);
+    surface.premultiplied = true;
+
+    clear();
+    return true;
+}