#include <dwrite.h>
-extern "C"
-{
+extern "C" {
#include "ass_directwrite.h"
#include "ass_utils.h"
}
+/*
+ * The private data stored for every font, detected by this backend.
+ */
typedef struct {
- IDWriteFont *font;
- IDWriteFontFileStream *stream;
+ IDWriteFont *font;
+ IDWriteFontFileStream *stream;
} FontPrivate;
+/*
+ * This function is called whenever a font is used for the first
+ * time. It will create a FontStream for memory reading, which
+ * will be stored within the private data.
+ */
static bool init_font_private(FontPrivate *priv)
{
- HRESULT hr = S_OK;
- IDWriteFont* font = priv->font;
- IDWriteFontFace* face = NULL;
- IDWriteFontFile* file = NULL;
- IDWriteFontFileStream* stream = NULL;
- IDWriteFontFileLoader* loader = NULL;
- UINT32 n_files = 1;
- const void* refKey = NULL;
- UINT32 keySize = 0;
-
- if (priv->stream != NULL)
- return true;
-
- hr = font->CreateFontFace(&face);
- if (FAILED(hr) || !face)
- return false;
-
- hr = face->GetFiles(&n_files, &file);
- if (FAILED(hr) || !file) {
- face->Release();
- return false;
- }
-
- hr = file->GetReferenceKey(&refKey, &keySize);
- if (FAILED(hr)) {
- file->Release();
- face->Release();
- return false;
- }
-
- hr = file->GetLoader(&loader);
- if (FAILED(hr) || !loader) {
- file->Release();
- face->Release();
- return false;
- }
-
- hr = loader->CreateStreamFromKey(refKey, keySize, &stream);
- if (FAILED(hr) || !stream) {
- file->Release();
- face->Release();
- return false;
- }
-
- priv->stream = stream;
- file->Release();
- face->Release();
-
- return true;
+ HRESULT hr = S_OK;
+ IDWriteFont *font = priv->font;
+ IDWriteFontFace *face = NULL;
+ IDWriteFontFile *file = NULL;
+ IDWriteFontFileStream *stream = NULL;
+ IDWriteFontFileLoader *loader = NULL;
+ UINT32 n_files = 1;
+ const void *refKey = NULL;
+ UINT32 keySize = 0;
+
+ if (priv->stream != NULL)
+ return true;
+
+ hr = font->CreateFontFace(&face);
+ if (FAILED(hr) || !face)
+ return false;
+
+ /* DirectWrite only supports one file per face */
+ hr = face->GetFiles(&n_files, &file);
+ if (FAILED(hr) || !file) {
+ face->Release();
+ return false;
+ }
+
+ hr = file->GetReferenceKey(&refKey, &keySize);
+ if (FAILED(hr)) {
+ file->Release();
+ face->Release();
+ return false;
+ }
+
+ hr = file->GetLoader(&loader);
+ if (FAILED(hr) || !loader) {
+ file->Release();
+ face->Release();
+ return false;
+ }
+
+ hr = loader->CreateStreamFromKey(refKey, keySize, &stream);
+ if (FAILED(hr) || !stream) {
+ file->Release();
+ face->Release();
+ return false;
+ }
+
+ priv->stream = stream;
+ file->Release();
+ face->Release();
+
+ return true;
}
-static size_t get_data(void *data, unsigned char* buf, size_t offset, size_t length)
+/*
+ * Read a specified part of a fontfile into memory.
+ * If the font wasn't used before first creates a
+ * FontStream and save it into the private data for later usage.
+ * If the parameter "buf" is NULL libass wants to know the
+ * size of the Fontfile
+ */
+static size_t get_data(void *data, unsigned char *buf, size_t offset,
+ size_t length)
{
- HRESULT hr = S_OK;
- FontPrivate *priv = (FontPrivate *)data;
- const void *fileBuf = NULL;
- void *fragContext = NULL;
+ HRESULT hr = S_OK;
+ FontPrivate *priv = (FontPrivate *) data;
+ const void *fileBuf = NULL;
+ void *fragContext = NULL;
- if (!init_font_private(priv))
- return 0;
+ if (!init_font_private(priv))
+ return 0;
- if (buf == NULL) {
- UINT64 fileSize;
- hr = priv->stream->GetFileSize(&fileSize);
- if (FAILED(hr))
- return 0;
+ if (buf == NULL) {
+ UINT64 fileSize;
+ hr = priv->stream->GetFileSize(&fileSize);
+ if (FAILED(hr))
+ return 0;
+
+ return fileSize;
+ }
- return fileSize;
- }
+ hr = priv->stream->ReadFileFragment(&fileBuf, offset, length, &fragContext);
- hr = priv->stream->ReadFileFragment(&fileBuf, offset, length, &fragContext);
- if (FAILED(hr) || !fileBuf)
- return 0;
+ if (FAILED(hr) || !fileBuf)
+ return 0;
- memcpy(buf, fileBuf, length);
+ memcpy(buf, fileBuf, length);
- priv->stream->ReleaseFileFragment(fragContext);
+ priv->stream->ReleaseFileFragment(fragContext);
- return length;
+ return length;
}
+/*
+ * Checks if the passed font has a specific unicode
+ * character. Returns 0 for failure and 1 for success
+ */
static int check_glyph(void *data, uint32_t code)
{
- HRESULT hr = S_OK;
- FontPrivate *priv = (FontPrivate *)data;
- BOOL exists = FALSE;
+ HRESULT hr = S_OK;
+ FontPrivate *priv = (FontPrivate *) data;
+ BOOL exists = FALSE;
- if (code == 0)
- return 1;
+ if (code == 0)
+ return 1;
- priv->font->HasCharacter(code, &exists);
- if (FAILED(hr))
- return 0;
+ priv->font->HasCharacter(code, &exists);
+ if (FAILED(hr))
+ return 0;
- return exists;
+ return exists;
}
+/*
+ * This will release the directwrite backend
+ */
static void destroy_provider(void *priv)
{
- ((IDWriteFactory*)priv)->Release();
+ ((IDWriteFactory *) priv)->Release();
}
+/*
+ * This will destroy a specific font and it's
+ * Fontstream (in case it does exist)
+ */
+
static void destroy_font(void *data)
{
- FontPrivate *priv = (FontPrivate *)data;
+ FontPrivate *priv = (FontPrivate *) data;
- priv->font->Release();
- if (priv->stream != NULL)
- priv->stream->Release();
+ priv->font->Release();
+ if (priv->stream != NULL)
+ priv->stream->Release();
- free(priv);
+ free(priv);
}
static int map_width(int stretch)
{
- return stretch * (100 / DWRITE_FONT_STRETCH_MEDIUM);
+ return stretch * (100 / DWRITE_FONT_STRETCH_MEDIUM);
}
-static void scan_fonts(IDWriteFactory *factory, ASS_FontProvider *provider)
+/*
+ * Scan every system font on the current machine and add it
+ * to the libass lookup. Stores the FontPrivate as private data
+ * for later memory reading
+ */
+static void scan_fonts(IDWriteFactory *factory,
+ ASS_FontProvider *provider)
{
- HRESULT hr = S_OK;
- IDWriteFontCollection* fontCollection = NULL;
- IDWriteFont* font = NULL;
- DWRITE_FONT_METRICS metrics;
- DWRITE_FONT_STYLE style;
- ASS_FontProviderMetaData meta = ASS_FontProviderMetaData();
- hr = factory->GetSystemFontCollection(&fontCollection,FALSE);
- wchar_t localeName[LOCALE_NAME_MAX_LENGTH];
- int size_needed = 0;
-
- if(FAILED(hr)||!fontCollection)
- return;
-
- UINT32 familyCount = fontCollection->GetFontFamilyCount();
-
- for (UINT32 i = 0; i < familyCount; ++i)
- {
- IDWriteFontFamily* fontFamily = NULL;
- IDWriteLocalizedStrings* familyNames = NULL;
- IDWriteLocalizedStrings* fontNames = NULL;
- IDWriteLocalizedStrings* psNames = NULL;
- BOOL exists = FALSE;
- char* psName = NULL;
-
- // Get the font family.
- hr = fontCollection->GetFontFamily(i, &fontFamily);
- if (FAILED(hr))
- return;
-
- UINT32 fontCount = fontFamily->GetFontCount();
- for (UINT32 j = 0; j < fontCount; ++j)
- {
- hr = fontFamily->GetFont(j, &font);
- if (FAILED(hr))
- continue;
-
- meta.weight = font->GetWeight();
- meta.width = map_width(font->GetStretch());
- font->GetMetrics(&metrics);
- style = font->GetStyle();
- meta.slant = (style==DWRITE_FONT_STYLE_NORMAL)? FONT_SLANT_NONE:
- (style==DWRITE_FONT_STYLE_OBLIQUE)? FONT_SLANT_OBLIQUE:
- (style==DWRITE_FONT_STYLE_ITALIC)? FONT_SLANT_ITALIC : FONT_SLANT_NONE;
-
- hr = font->GetInformationalStrings(DWRITE_INFORMATIONAL_STRING_POSTSCRIPT_NAME, &psNames, &exists);
- if (FAILED(hr))
- {
- font->Release();
- continue;
- }
-
-
- if (exists)
- {
- hr = psNames->GetString(0, localeName, LOCALE_NAME_MAX_LENGTH + 1);
- if (FAILED(hr))
- {
- psNames->Release();
- font->Release();
- continue;
- }
-
- size_needed = WideCharToMultiByte(CP_UTF8, 0, localeName, -1, NULL, 0, NULL, NULL);
- psName = (char*)malloc(size_needed);
- WideCharToMultiByte(CP_UTF8, 0, localeName, -1, psName, size_needed, NULL, NULL);
- }
-
- psNames->Release();
-
- hr = font->GetInformationalStrings(DWRITE_INFORMATIONAL_STRING_FULL_NAME, &fontNames, &exists);
- if (FAILED(hr))
- {
- font->Release();
- continue;
- }
-
-
- meta.n_fullname = fontNames->GetCount();
- meta.fullnames = (char **)calloc(meta.n_fullname, sizeof(char *));
- for (UINT32 k = 0; k < meta.n_fullname; ++k)
- {
- hr = fontNames->GetString(k,localeName, LOCALE_NAME_MAX_LENGTH + 1);
- if (FAILED(hr))
- {
- continue;
- }
-
- size_needed = WideCharToMultiByte(CP_UTF8, 0, localeName, -1, NULL, 0, NULL, NULL);
- char* mbName = (char *)malloc(size_needed);
- WideCharToMultiByte(CP_UTF8, 0, localeName, -1, mbName, size_needed, NULL, NULL);
- meta.fullnames[k] = mbName;
- }
- fontNames->Release();
-
- hr = fontFamily->GetFamilyNames(&familyNames);
- if (FAILED(hr))
- {
- font->Release();
- continue;
- }
-
-
- meta.n_family = familyNames->GetCount();
- meta.families = (char **)calloc(meta.n_family, sizeof(char *));
- for (UINT32 k = 0; k < meta.n_family; ++k)
- {
- hr = familyNames->GetString(k, localeName, LOCALE_NAME_MAX_LENGTH + 1);
- if (FAILED(hr))
- {
- continue;
- }
-
- size_needed = WideCharToMultiByte(CP_UTF8, 0, localeName, -1, NULL, 0, NULL, NULL);
- char* mbName = (char *)malloc(size_needed);
- WideCharToMultiByte(CP_UTF8, 0, localeName, -1, mbName, size_needed, NULL, NULL);
- meta.families[k] = mbName;
- }
- familyNames->Release();
-
- FontPrivate *font_priv = (FontPrivate *)calloc(1, sizeof(*font_priv));
- font_priv->font = font;
-
- ass_font_provider_add_font(provider, &meta, NULL, 0, psName, font_priv);
-
- for (UINT32 k = 0; k < meta.n_family; ++k)
- free(meta.families[k]);
- for (UINT32 k = 0; k < meta.n_fullname; ++k)
- free(meta.fullnames[k]);
- free(meta.fullnames);
- free(meta.families);
- free(psName);
- }
+ HRESULT hr = S_OK;
+ IDWriteFontCollection *fontCollection = NULL;
+ IDWriteFont *font = NULL;
+ DWRITE_FONT_METRICS metrics;
+ DWRITE_FONT_STYLE style;
+ ASS_FontProviderMetaData meta = ASS_FontProviderMetaData();
+ hr = factory->GetSystemFontCollection(&fontCollection, FALSE);
+ wchar_t localeName[LOCALE_NAME_MAX_LENGTH];
+ int size_needed = 0;
+
+ if (FAILED(hr) || !fontCollection)
+ return;
+
+ UINT32 familyCount = fontCollection->GetFontFamilyCount();
+
+ for (UINT32 i = 0; i < familyCount; ++i) {
+ IDWriteFontFamily *fontFamily = NULL;
+ IDWriteLocalizedStrings *familyNames = NULL;
+ IDWriteLocalizedStrings *fontNames = NULL;
+ IDWriteLocalizedStrings *psNames = NULL;
+ BOOL exists = FALSE;
+ char *psName = NULL;
+
+ hr = fontCollection->GetFontFamily(i, &fontFamily);
+ if (FAILED(hr))
+ return;
+
+ UINT32 fontCount = fontFamily->GetFontCount();
+ for (UINT32 j = 0; j < fontCount; ++j) {
+ hr = fontFamily->GetFont(j, &font);
+ if (FAILED(hr))
+ continue;
+
+ meta.weight = font->GetWeight();
+ meta.width = map_width(font->GetStretch());
+ font->GetMetrics(&metrics);
+ style = font->GetStyle();
+ meta.slant = (style == DWRITE_FONT_STYLE_NORMAL) ? FONT_SLANT_NONE :
+ (style == DWRITE_FONT_STYLE_OBLIQUE)? FONT_SLANT_OBLIQUE :
+ (style == DWRITE_FONT_STYLE_ITALIC) ? FONT_SLANT_ITALIC : FONT_SLANT_NONE;
+
+ hr = font->GetInformationalStrings(DWRITE_INFORMATIONAL_STRING_POSTSCRIPT_NAME, &psNames,&exists);
+
+ if (FAILED(hr)) {
+ font->Release();
+ continue;
+ }
+
+ if (exists) {
+ hr = psNames->GetString(0, localeName, LOCALE_NAME_MAX_LENGTH + 1);
+ if (FAILED(hr)) {
+ psNames->Release();
+ font->Release();
+ continue;
+ }
+
+ size_needed = WideCharToMultiByte(CP_UTF8, 0, localeName, -1, NULL, 0,NULL, NULL);
+ psName = (char *) malloc(size_needed);
+ WideCharToMultiByte(CP_UTF8, 0, localeName, -1, psName,size_needed, NULL, NULL);
+ }
+
+ psNames->Release();
+
+ hr = font->GetInformationalStrings(DWRITE_INFORMATIONAL_STRING_FULL_NAME, &fontNames,&exists);
+ if (FAILED(hr)) {
+ font->Release();
+ continue;
+ }
+
+ meta.n_fullname = fontNames->GetCount();
+ meta.fullnames = (char **) calloc(meta.n_fullname, sizeof(char *));
+ for (UINT32 k = 0; k < meta.n_fullname; ++k) {
+ hr = fontNames->GetString(k, localeName,LOCALE_NAME_MAX_LENGTH + 1);
+
+ if (FAILED(hr)) {
+ continue;
+ }
+
+ size_needed = WideCharToMultiByte(CP_UTF8, 0, localeName, -1, NULL, 0, NULL, NULL);
+ char *mbName = (char *) malloc(size_needed);
+ WideCharToMultiByte(CP_UTF8, 0, localeName, -1, mbName,size_needed, NULL, NULL);
+ meta.fullnames[k] = mbName;
+ }
+ fontNames->Release();
+
+ hr = fontFamily->GetFamilyNames(&familyNames);
+ if (FAILED(hr)) {
+ font->Release();
+ continue;
+ }
+
+
+ meta.n_family = familyNames->GetCount();
+ meta.families = (char **) calloc(meta.n_family, sizeof(char *));
+ for (UINT32 k = 0; k < meta.n_family; ++k) {
+ hr = familyNames->GetString(k, localeName, LOCALE_NAME_MAX_LENGTH + 1);
+
+ if (FAILED(hr)) {
+ continue;
+ }
+
+ size_needed = WideCharToMultiByte(CP_UTF8, 0, localeName, -1, NULL, 0,NULL, NULL);
+ char *mbName = (char *) malloc(size_needed);
+ WideCharToMultiByte(CP_UTF8, 0, localeName, -1, mbName,size_needed, NULL, NULL);
+ meta.families[k] = mbName;
+ }
+ familyNames->Release();
+
+ FontPrivate *font_priv = (FontPrivate *) calloc(1, sizeof(*font_priv));
+ font_priv->font = font;
+
+ ass_font_provider_add_font(provider, &meta, NULL, 0, psName, font_priv);
+
+ for (UINT32 k = 0; k < meta.n_family; ++k)
+ free(meta.families[k]);
+ for (UINT32 k = 0; k < meta.n_fullname; ++k)
+ free(meta.fullnames[k]);
+ free(meta.fullnames);
+ free(meta.families);
+ free(psName);
+ }
}
}
+/*
+ * Called by libass when the provider should perform the
+ * specified task
+ */
static ASS_FontProviderFuncs directwrite_callbacks = {
get_data,
- check_glyph,
+ check_glyph,
destroy_font,
destroy_provider,
NULL,
+ NULL,
+ NULL
};
-ASS_FontProvider *
-ass_directwrite_add_provider(ASS_Library *lib, ASS_FontSelector *selector,
- const char *config)
+
+/*
+ * Register the directwrite provider. Upon registering
+ * scans all system fonts. The private data for this
+ * provider is IDWriteFactory
+ * On failure returns NULL
+ */
+ASS_FontProvider *ass_directwrite_add_provider(ASS_Library *lib,
+ ASS_FontSelector *selector,
+ const char *config)
{
- HRESULT hr = S_OK;
- IDWriteFactory* dwFactory = NULL;
- ASS_FontProvider *provider = NULL;
+ HRESULT hr = S_OK;
+ IDWriteFactory *dwFactory = NULL;
+ ASS_FontProvider *provider = NULL;
- hr = DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED,
- __uuidof(IDWriteFactory),
- (IUnknown**)(&dwFactory));
+ hr = DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED,
+ __uuidof(IDWriteFactory),
+ (IUnknown **) (&dwFactory));
- if(FAILED(hr))
- {
- ass_msg(lib, MSGL_WARN, "Failed to initialize directwrite.");
- goto exit;
- }
-
+ if (FAILED(hr)) {
+ ass_msg(lib, MSGL_WARN, "Failed to initialize directwrite.");
+ return NULL;
+ }
provider = ass_font_provider_new(selector, &directwrite_callbacks, dwFactory);
- scan_fonts(dwFactory,provider);
-exit:
+ scan_fonts(dwFactory, provider);
+
return provider;
}
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