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skia2/tools/skiaserve/skiaserve.cpp

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C++
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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrCaps.h"
#include "GrContextFactory.h"
#include "SkCanvas.h"
#include "SkCommandLineFlags.h"
#include "SkPicture.h"
#include "SkStream.h"
#include "SkSurface.h"
#include <sys/socket.h>
#include <microhttpd.h>
// To get image decoders linked in we have to do the below magic
#include "SkForceLinking.h"
#include "SkImageDecoder.h"
__SK_FORCE_IMAGE_DECODER_LINKING;
// TODO make this configurable
#define PORT 8888
DEFINE_string(dir, "skps", "Directory to read skp.");
DEFINE_string(name, "desk_carsvg", "skp to load.");
DEFINE_bool(useTemplate, true, "whether or not to use the skdebugger template string.");
// TODO probably want to make this configurable
static const int kImageWidth = 1920;
static const int kImageHeight = 1080;
// TODO factor this out into functions, also handle CPU path
SkData* setupAndDrawToCanvas(SkStream* stream, SkString* error) {
GrContextOptions grContextOpts;
SkAutoTDelete<GrContextFactory> factory(new GrContextFactory(grContextOpts));
GrContext* context = factory->get(GrContextFactory::kNative_GLContextType,
GrContextFactory::kNone_GLContextOptions);
int maxRTSize = context->caps()->maxRenderTargetSize();
SkImageInfo info = SkImageInfo::Make(SkTMin(kImageWidth, maxRTSize),
SkTMin(kImageHeight, maxRTSize),
kN32_SkColorType, kPremul_SkAlphaType);
uint32_t flags = 0;
SkSurfaceProps props(flags, SkSurfaceProps::kLegacyFontHost_InitType);
SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTarget(context,
SkSurface::kNo_Budgeted, info,
0, &props));
SkASSERT(surface.get());
SkGLContext* gl = factory->getContextInfo(GrContextFactory::kNative_GLContextType,
GrContextFactory::kNone_GLContextOptions).fGLContext;
gl->makeCurrent();
// draw
SkAutoTUnref<SkPicture> pic(SkPicture::CreateFromStream(stream));
if (pic.get() == nullptr) {
error->appendf("Could not create picture from stream.\n");
return nullptr;
}
SkCanvas* canvas = surface->getCanvas();
canvas->drawPicture(pic);
// capture pixels
SkBitmap bmp;
bmp.setInfo(canvas->imageInfo());
if (!canvas->readPixels(&bmp, 0, 0)) {
error->appendf("Can't read canvas pixels.\n");
return nullptr;
}
// write to png
SkData* data = SkImageEncoder::EncodeData(bmp, SkImageEncoder::kPNG_Type, 100);
if (!data) {
error->appendf("Can't encode a PNG.\n");
return nullptr;
}
return data;
}
// TODO move to template file
SkString generateTemplate(SkString source) {
SkString debuggerTemplate;
debuggerTemplate.appendf(
"<!DOCTYPE html>\n"
"<html>\n"
"<head>\n"
" <title>SkDebugger</title>\n"
" <meta charset=\"utf-8\" />\n"
" <meta http-equiv=\"X-UA-Compatible\" content=\"IE=egde,chrome=1\">\n"
" <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n"
" <script src=\"%s/res/js/core.js\" type=\"text/javascript\" charset=\"utf-8\"></script>\n"
" <link href=\"%s/res/vul/elements.html\" rel=\"import\" />\n"
"</head>\n"
"<body class=\"fullbleed layout vertical\">\n"
" <debugger-app-sk>This is the app."
" </debugger-app-sk>\n"
"</body>\n"
"</html>", source.c_str(), source.c_str());
return debuggerTemplate;
}
struct UploadContext {
SkDynamicMemoryWStream stream;
MHD_PostProcessor* pp;
MHD_Connection* connection;
};
struct Request {
Request() : fUploadContext(nullptr) {}
UploadContext* fUploadContext;
SkAutoTUnref<SkData> fPNG;
};
static const size_t kBufferSize = 1024;
static int process_upload_data(void* cls, enum MHD_ValueKind kind,
const char* key, const char* filename,
const char* content_type, const char* transfer_encoding,
const char* data, uint64_t off, size_t size) {
struct UploadContext* uc = reinterpret_cast<UploadContext*>(cls);
if (0 != size) {
uc->stream.write(data, size);
}
return MHD_YES;
}
static int SendImage(MHD_Connection* connection, const SkData* data) {
MHD_Response* response = MHD_create_response_from_buffer(data->size(),
const_cast<void*>(data->data()),
MHD_RESPMEM_MUST_COPY);
MHD_add_response_header(response, "Content-Type", "image/png");
int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
MHD_destroy_response(response);
return ret;
}
static int SendTemplate(MHD_Connection* connection) {
SkString debuggerTemplate = generateTemplate(SkString("http://debugger.skia.org"));
MHD_Response* response = MHD_create_response_from_buffer(
debuggerTemplate.size(),
(void*) const_cast<char*>(debuggerTemplate.c_str()),
MHD_RESPMEM_MUST_COPY);
int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
MHD_destroy_response(response);
return ret;
}
typedef int (*UrlHandler)(Request* request, MHD_Connection* connection,
const char* upload_data, size_t* upload_data_size);
int rootHandler(Request* request, MHD_Connection* connection,
const char* upload_data, size_t* upload_data_size) {
return SendTemplate(connection);
}
int postHandler(Request* request, MHD_Connection* connection,
const char* upload_data, size_t* upload_data_size) {
UploadContext* uc = request->fUploadContext;
// New connection
if (!uc) {
// TODO make this a method on request
uc = new UploadContext;
uc->connection = connection;
uc->pp = MHD_create_post_processor(connection, kBufferSize, &process_upload_data, uc);
SkASSERT(uc->pp);
request->fUploadContext = uc;
return MHD_YES;
}
// in process upload
if (0 != *upload_data_size) {
SkASSERT(uc->pp);
MHD_post_process(uc->pp, upload_data, *upload_data_size);
*upload_data_size = 0;
return MHD_YES;
}
// end of upload
MHD_destroy_post_processor(uc->pp);
uc->pp = nullptr;
// TODO response
SkString error;
SkData* data = setupAndDrawToCanvas(uc->stream.detachAsStream(), &error);
if (!data) {
// TODO send error
return MHD_YES;
}
request->fPNG.reset(data);
return SendTemplate(connection);
}
int imgHandler(Request* request, MHD_Connection* connection,
const char* upload_data, size_t* upload_data_size) {
if (request->fPNG.get()) {
SkData* data = request->fPNG.get();
return SendImage(connection, data);
}
return MHD_NO;
}
class UrlManager {
public:
UrlManager() {
// Register handlers
fHandlers.push_back({MHD_HTTP_METHOD_GET, "/", rootHandler});
fHandlers.push_back({MHD_HTTP_METHOD_POST, "/new", postHandler});
fHandlers.push_back({MHD_HTTP_METHOD_GET, "/img", imgHandler});
}
// This is clearly not efficient for a large number of urls and handlers
int invoke(Request* request, MHD_Connection* connection, const char* url, const char* method,
const char* upload_data, size_t* upload_data_size) const {
for (int i = 0; i < fHandlers.count(); i++) {
const Url& urlHandler = fHandlers[i];
if (0 == strcmp(method, urlHandler.fMethod) &&
0 == strcmp(url, urlHandler.fPath)) {
return (*urlHandler.fHandler)(request, connection, upload_data,
upload_data_size);
}
}
return MHD_NO;
}
private:
struct Url {
const char* fMethod;
const char* fPath;
UrlHandler fHandler;
};
SkTArray<Url> fHandlers;
};
const UrlManager kUrlManager;
int answer_to_connection(void* cls, struct MHD_Connection* connection,
const char* url, const char* method, const char* version,
const char* upload_data, size_t* upload_data_size,
void** con_cls) {
SkDebugf("New %s request for %s using version %s\n", method, url, version);
Request* request = reinterpret_cast<Request*>(cls);
return kUrlManager.invoke(request, connection, url, method, upload_data, upload_data_size);
}
int skiaserve_main() {
Request request; // This simple server has one request
struct MHD_Daemon* daemon;
daemon = MHD_start_daemon(MHD_USE_SELECT_INTERNALLY, PORT, nullptr, nullptr,
&answer_to_connection, &request,
MHD_OPTION_END);
if (NULL == daemon) {
return 1;
}
getchar();
MHD_stop_daemon(daemon);
return 0;
}
#if !defined SK_BUILD_FOR_IOS
int main(int argc, char** argv) {
SkCommandLineFlags::Parse(argc, argv);
return skiaserve_main();
}
#endif
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