Started working on font packs

1 files changed, 107 insertions, 0 deletions

diff --git a/src/fontpack.h b/src/fontpack.h
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+/* Copyright 2021 Jaakko Keränen <jaakko.keranen@iki.fi>
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
+
+#pragma once
+
+#include <the_Foundation/archive.h>
+#include "stb_truetype.h"
+
+#if defined (LAGRANGE_ENABLE_HARFBUZZ)
+#   include <hb.h>
+#endif
+
+/* Fontpacks are ZIP archives that contain a configuration file and one of more font
+files. The fontpack format is used instead of plain TTF/OTF because the text renderer
+uses additional metadata about each font.
+
+All the available fontpacks are loaded and used for looking up glyphs for rendering.
+The user may install new fontpacks via the GUI. The user's fontpacks are stored inside
+the config directory. There may also be fontpacks available from system-wide locations. */
+
+enum iFontSize {
+    uiTiny_FontSize,   /* 0.800 */
+    uiSmall_FontSize,  /* 0.900 */
+    uiNormal_FontSize, /* 1.000 */
+    uiMedium_FontSize, /* 1.125 */
+    uiBig_FontSize,    /* 1.333 */
+    uiLarge_FontSize,  /* 1.666 */
+    contentRegular_FontSize,
+    contentMedium_FontSize,
+    contentBig_FontSize,
+    contentLarge_FontSize,
+    contentHuge_FontSize,
+    contentMonoSmall_FontSize,
+    contentMono_FontSize,
+    max_FontSize
+};
+
+enum iFontStyle {
+    regular_FontStyle,
+    italic_FontStyle,
+    light_FontStyle,
+    semiBold_FontStyle,
+    bold_FontStyle,
+    max_FontStyle
+};
+
+iLocalDef enum iFontSize larger_FontSize(enum iFontSize size) {
+    if (size == uiLarge_FontSize || size == contentHuge_FontSize || size == contentMono_FontSize) {
+        return size; /* largest available */
+    }
+    return size + 1;
+}
+
+iDeclareType(FontSpec)
+iDeclareTypeConstruction(FontSpec)
+
+enum iFontSpecFlags {
+    monospace_FontSpecFlag = iBit(1), /* can be used in preformatted content */
+    auxiliary_FontSpecFlag = iBit(2), /* only used for looking up glyphs missing from other fonts */
+    arabic_FontSpecFlag    = iBit(3),
+};
+
+iDeclareType(FontFile)
+iDeclareTypeConstruction(FontFile)
+    
+struct Impl_FontFile {
+    enum iFontStyle style;
+    iBlock          sourceData;
+    stbtt_fontinfo  stbInfo;
+#if defined (LAGRANGE_ENABLE_HARFBUZZ)
+    hb_blob_t *hbBlob;
+    hb_face_t *hbFace;
+    hb_font_t *hbFont;
+#endif
+};
+
+struct Impl_FontSpec {
+    iString id;   /* unique ID */
+    iString name; /* human-readable label */
+    int     flags;
+    int     priority;
+    float   scaling;
+    const iFontFile *styles[max_FontSize];
+};
+ 
+void    init_Fonts      (const char *userDir);
+void    deinit_Fonts    (void);
+