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#include "vector_vimageloader.h"
#include "config.h"
#include "vector_vdebug.h"
#include <cstring>
#ifdef _WIN32
# include <windows.h>
#else
# include <dlfcn.h>
#endif // _WIN32
using lottie_image_load_f = unsigned char *(*)(const char *filename, int *x,
int *y, int *comp, int req_comp);
using lottie_image_load_data_f = unsigned char *(*)(const char *data, int len,
int *x, int *y, int *comp,
int req_comp);
using lottie_image_free_f = void (*)(unsigned char *);
#ifdef __cplusplus
extern "C" {
#endif
extern unsigned char *lottie_image_load(char const *filename, int *x, int *y,
int *comp, int req_comp);
extern unsigned char *lottie_image_load_from_data(const char *imageData,
int len, int *x, int *y,
int *comp, int req_comp);
extern void lottie_image_free(unsigned char *data);
#ifdef __cplusplus
}
#endif
struct VImageLoader::Impl {
lottie_image_load_f imageLoad{nullptr};
lottie_image_free_f imageFree{nullptr};
lottie_image_load_data_f imageFromData{nullptr};
#ifdef LOTTIE_IMAGE_MODULE_SUPPORT
# ifdef _WIN32
HMODULE dl_handle{nullptr};
bool moduleLoad()
{
dl_handle = LoadLibraryA(LOTTIE_IMAGE_MODULE_PLUGIN);
return (dl_handle == nullptr);
}
void moduleFree()
{
if (dl_handle) FreeLibrary(dl_handle);
}
void init()
{
imageLoad = reinterpret_cast<lottie_image_load_f>(
GetProcAddress(dl_handle, "lottie_image_load"));
imageFree = reinterpret_cast<lottie_image_free_f>(
GetProcAddress(dl_handle, "lottie_image_free"));
imageFromData = reinterpret_cast<lottie_image_load_data_f>(
GetProcAddress(dl_handle, "lottie_image_load_from_data"));
}
# else // _WIN32
void *dl_handle{nullptr};
void init()
{
imageLoad = reinterpret_cast<lottie_image_load_f>(
dlsym(dl_handle, "lottie_image_load"));
imageFree = reinterpret_cast<lottie_image_free_f>(
dlsym(dl_handle, "lottie_image_free"));
imageFromData = reinterpret_cast<lottie_image_load_data_f>(
dlsym(dl_handle, "lottie_image_load_from_data"));
}
void moduleFree()
{
if (dl_handle) dlclose(dl_handle);
}
bool moduleLoad()
{
dl_handle = dlopen(LOTTIE_IMAGE_MODULE_PLUGIN, RTLD_LAZY);
return (dl_handle == nullptr);
}
# endif // _WIN32
#else // LOTTIE_IMAGE_MODULE_SUPPORT
void init()
{
imageLoad = lottie_image_load;
imageFree = lottie_image_free;
imageFromData = lottie_image_load_from_data;
}
void moduleFree() {}
bool moduleLoad() { return false; }
#endif // LOTTIE_IMAGE_MODULE_SUPPORT
Impl()
{
if (moduleLoad()) {
vWarning << "Failed to dlopen librlottie-image-loader library";
return;
}
init();
if (!imageLoad)
vWarning << "Failed to find symbol lottie_image_load in "
"librlottie-image-loader library";
if (!imageFree)
vWarning << "Failed to find symbol lottie_image_free in "
"librlottie-image-loader library";
if (!imageFromData)
vWarning << "Failed to find symbol lottie_image_load_data in "
"librlottie-image-loader library";
}
~Impl() { moduleFree(); }
VBitmap createBitmap(unsigned char *data, int width, int height,
int channel)
{
// premultiply alpha
if (channel == 4)
convertToBGRAPremul(data, width, height);
else
convertToBGRA(data, width, height);
// create a bitmap of same size.
VBitmap result =
VBitmap(width, height, VBitmap::Format::ARGB32_Premultiplied);
// copy the data to bitmap buffer
memcpy(result.data(), data, width * height * 4);
// free the image data
imageFree(data);
return result;
}
VBitmap load(const char *fileName)
{
if (!imageLoad) return VBitmap();
int width, height, n;
unsigned char *data = imageLoad(fileName, &width, &height, &n, 4);
if (!data) {
return VBitmap();
}
return createBitmap(data, width, height, n);
}
VBitmap load(const char *imageData, size_t len)
{
if (!imageFromData) return VBitmap();
int width, height, n;
unsigned char *data =
imageFromData(imageData, static_cast<int>(len), &width, &height, &n, 4);
if (!data) {
return VBitmap();
}
return createBitmap(data, width, height, n);
}
/*
* convert from RGBA to BGRA and premultiply
*/
void convertToBGRAPremul(unsigned char *bits, int width, int height)
{
int pixelCount = width * height;
unsigned char *pix = bits;
for (int i = 0; i < pixelCount; i++) {
unsigned char r = pix[0];
unsigned char g = pix[1];
unsigned char b = pix[2];
unsigned char a = pix[3];
r = (r * a) / 255;
g = (g * a) / 255;
b = (b * a) / 255;
pix[0] = b;
pix[1] = g;
pix[2] = r;
pix += 4;
}
}
/*
* convert from RGBA to BGRA
*/
void convertToBGRA(unsigned char *bits, int width, int height)
{
int pixelCount = width * height;
unsigned char *pix = bits;
for (int i = 0; i < pixelCount; i++) {
unsigned char r = pix[0];
unsigned char b = pix[2];
pix[0] = b;
pix[2] = r;
pix += 4;
}
}
};
VImageLoader::VImageLoader() : mImpl(std::make_unique<VImageLoader::Impl>()) {}
VImageLoader::~VImageLoader() {}
VBitmap VImageLoader::load(const char *fileName)
{
return mImpl->load(fileName);
}
VBitmap VImageLoader::load(const char *data, size_t len)
{
return mImpl->load(data, int(len));
}
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