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wasm: support font url by emscripten fetch (wip)

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Jinny You 2025-02-21 02:17:21 +08:00
parent 1416e99f34
commit 5b05f485e3
2 changed files with 64 additions and 2 deletions
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2
cross/wasm32.txt
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@ -12,7 +12,7 @@ exe_suffix = 'js'
[built-in options]
cpp_args = ['-Wshift-negative-value', '-flto', '-Oz', '-fno-exceptions']
cpp_link_args = ['-Wshift-negative-value', '-flto', '-Oz', '-fno-exceptions', '--bind', '-sWASM=1', '-sALLOW_MEMORY_GROWTH=1', '-sEXPORT_ES6=1', '-sFORCE_FILESYSTEM=1', '-sMODULARIZE=1', '-sEXPORTED_RUNTIME_METHODS=FS', '-sUSE_WEBGPU=1', '-sMAX_WEBGL_VERSION=2', '-sFULL_ES3']
cpp_link_args = ['-Wshift-negative-value', '-flto', '-Oz', '-fno-exceptions', '--bind', '-sWASM=1', '-sALLOW_MEMORY_GROWTH=1', '-sEXPORT_ES6=1', '-sFORCE_FILESYSTEM=1', '-sMODULARIZE=1', '-sEXPORTED_RUNTIME_METHODS=FS', '-sUSE_WEBGPU=1', '-sMAX_WEBGL_VERSION=2', '-sFULL_ES3', '-sFETCH']
[host_machine]
system = 'emscripten'

64
src/loaders/lottie/tvgLottieParser.cpp
View file

@ -26,6 +26,10 @@
#include "tvgLottieParser.h"
#include "tvgLottieExpressions.h"
#ifdef __EMSCRIPTEN__
#include <emscripten/fetch.h>
#endif
/************************************************************************/
/* Internal Class Implementation */
@ -953,6 +957,45 @@ LottieObject* LottieParser::parseAsset()
return obj;
}
void downloadSucceeded(emscripten_fetch_t *fetch) {
printf("Finished downloading %llu bytes from URL %s.\n", fetch->numBytes, fetch->url);
// The data is now available at fetch->data[0] through fetch->data[fetch->numBytes-1];
const char* fontName = static_cast<const char*>(fetch->userData);
auto res = Text::load(fontName, reinterpret_cast<const char*>(fetch->data), fetch->numBytes, "ttf", true);
if (res != Result::Success) {
printf("Failed to load font");
} else {
printf("Font loaded successfully");
// printf("Font name: %s", fontName);
}
emscripten_fetch_close(fetch); // Free data associated with the fetch.
}
void downloadFailed(emscripten_fetch_t *fetch) {
printf("Downloading %s failed, HTTP failure status code: %d.\n", fetch->url, fetch->status);
emscripten_fetch_close(fetch); // Also free data on failure.
}
void parseFontURL(LottieFont* font, const char* data) {
#ifdef __EMSCRIPTEN__
if (!data || !font->name) return;
size_t len = strlen(data);
if (len < 4) return;
if (strcmp(data + len - 4, ".ttf") != 0) return;
// Fetch font data from URL using emscripten
emscripten_fetch_attr_t attr;
emscripten_fetch_attr_init(&attr);
attr.attributes = EMSCRIPTEN_FETCH_LOAD_TO_MEMORY;
attr.onsuccess = downloadSucceeded;
attr.onerror = downloadFailed;
attr.userData = (void*)font->name;
emscripten_fetch(&attr, data);
return;
#endif
TVGLOG("LOTTIE", "Font URL loading is only supported in Emscripten builds");
return;
}
void LottieParser::parseFontData(LottieFont* font, const char* data)
{
@ -972,17 +1015,36 @@ LottieFont* LottieParser::parseFont()
enterObject();
auto font = new LottieFont;
#ifdef __EMSCRIPTEN__
char* url = nullptr;
#endif
while (auto key = nextObjectKey()) {
if (KEY_AS("fName")) font->name = getStringCopy();
else if (KEY_AS("fFamily")) font->family = getStringCopy();
else if (KEY_AS("fStyle")) font->style = getStringCopy();
else if (KEY_AS("fPath")) parseFontData(font, getString());
else if (KEY_AS("fPath")) {
auto data = getString();
#ifdef __EMSCRIPTEN__
if (strncmp(data, "https://", 8) == 0) {
url = strdup(data);
continue;
}
#endif
parseFontData(font, data);
}
else if (KEY_AS("ascent")) font->ascent = getFloat();
else if (KEY_AS("origin")) font->origin = (LottieFont::Origin) getInt();
else skip();
}
// post process here
// if parseFontdata is failed, and has fName, try to load from URL
#ifdef __EMSCRIPTEN__
parseFontURL(font, url);
tvg::free(url);
#endif
font->prepare();
return font;
}