skeleton to support WebP file

configure.ac

@@ -1,6 +1,6 @@
 dnl Process this file with autoconf to produce a configure script.
 AC_PREREQ(2.60)
-AC_INIT(libminigui, 5.0.7)
+AC_INIT(libminigui, 5.0.8)
 AC_CONFIG_SRCDIR(src/main/main.c)
 
 dnl Set various version strings - taken gratefully from the SDL sources
@@ -16,9 +16,9 @@ dnl Set various version strings - taken gratefully from the SDL sources
 #
 MINIGUI_MAJOR_VERSION=5
 MINIGUI_MINOR_VERSION=0
-MINIGUI_MICRO_VERSION=7
-MINIGUI_INTERFACE_AGE=1
-MINIGUI_BINARY_AGE=1
+MINIGUI_MICRO_VERSION=8
+MINIGUI_INTERFACE_AGE=2
+MINIGUI_BINARY_AGE=2
 MINIGUI_VERSION=$MINIGUI_MAJOR_VERSION.$MINIGUI_MINOR_VERSION.$MINIGUI_MICRO_VERSION
 
 AC_SUBST(MINIGUI_MAJOR_VERSION)
@@ -222,6 +222,7 @@ build_save_bitmap="yes"
 build_gif_support="yes"
 build_jpg_support="yes"
 build_png_support="yes"
+build_webp_support="yes"
 build_pcx_support="no"
 build_lbm_support="no"
 build_tga_support="no"
@@ -727,6 +728,10 @@ AC_ARG_ENABLE(pngsupport,
 [  --enable-pngsupport      include PNG file support <default=yes>],
 build_png_support=$enableval)
 
+AC_ARG_ENABLE(webpsupport,
+[  --enable-webpsupport     include WebP file support <default=yes>],
+build_webp_support=$enableval)
+
 AC_ARG_ENABLE(menu,
 [  --enable-menu            include menu support <default=yes>],
 build_menu=$enableval)
@@ -1438,6 +1443,12 @@ case "$libpng_version" in
     ;;
 esac
 
+dnl Check for WebP library.
+if test "x$build_webp_support" = "xyes"; then
+    PKG_CHECK_MODULES([WEBP], [libwebp >= 0.6.0], [foo=bar],
+        [build_webp_support="no; support WebP file requires libwebp 0.6.0 or later."])
+fi
+
 AC_DEFINE_UNQUOTED(MINIGUI_MAJOR_VERSION, $MINIGUI_MAJOR_VERSION,
             [Major version of MiniGUI])
 AC_DEFINE_UNQUOTED(MINIGUI_MINOR_VERSION, $MINIGUI_MINOR_VERSION,
@@ -2436,16 +2447,30 @@ fi
 
 if test "x$build_jpg_support" = "xyes"; then
     AC_DEFINE(_MGIMAGE_JPG, 1,
-            [Define if support JPEG bmp file format])
+            [Define if support JPEG file format])
 fi
 
 if test "x$build_png_support" = "xyes"; then
     AC_DEFINE(_MGIMAGE_PNG, 1,
-            [Define if support PNG bmp file format])
+            [Define if support PNG file format])
     AC_DEFINE_UNQUOTED(_MGLIBPNG_VER, $libpng_version,
             [Define version of libpng])
 fi
 
+if test "x$build_webp_support" = "xyes"; then
+    AC_DEFINE(_MGIMAGE_WEBP, 1,
+         [Define if support WebP file format])
+    AC_ARG_WITH(webp_includes,
+[  --with-webp-includes=DIR   where the libwebp includes are])
+
+    if test "x$with_webp_includes" != "x"; then
+        WEBP_CFLAGS="-I$with_webp_includes"
+    fi
+
+    DEP_LIBS="$DEP_LIBS $WEBP_LIBS"
+    AC_SUBST(WEBP_CFLAGS)
+fi
+
 if test "x$build_menu" = "xyes"; then
     AC_DEFINE(_MGHAVE_MENU, 1,
             [Define if support menu])
@@ -2774,6 +2799,7 @@ AC_MSG_NOTICE([
 ## Other Features:
   * JPEG:               ${build_jpg_support}
   * PNG:                ${build_png_support}
+  * WebP:               ${build_webp_support}
   * Unicode:            ${build_unicode_support}
   * Complex Scripts:    ${build_complex_scripts}
 
@@ -2782,6 +2808,7 @@ AC_MSG_NOTICE([
   * CPP flags:          ${CPPFLAGS}
   * CC  flags:          ${CFLAGS}
   * CXX flags:          ${CXXFLAGS}
+  * LibWebP includes:   ${WEBP_CFLAGS}
   * Pixman includes:    ${PIXMAN_CFLAGS}
   * FreeType2 includes: ${FT2_INC_DIR}
   * HarfBuzz includes:  ${HB_INC_DIR}

src/include/readbmp.h

@@ -138,6 +138,14 @@ int __mg_save_png (MG_RWops* fp, MYBITMAP* bmp, RGB* pal);
 BOOL __mg_check_png (MG_RWops* fp);
 #endif
 
+#ifdef _MGIMAGE_WEBP
+void* __mg_init_webp (MG_RWops* fp, MYBITMAP *png, RGB *pal);
+int __mg_load_webp (MG_RWops* fp, void* init_info, MYBITMAP *png, CB_ONE_SCANLINE cb, void* context);
+void __mg_cleanup_webp (void* init_info);
+int __mg_save_webp (MG_RWops* fp, MYBITMAP* bmp, RGB* pal);
+BOOL __mg_check_webp (MG_RWops* fp);
+#endif
+
 int __mg_bmp_compute_pitch (int bpp, Uint32 width, Uint32 *pitch, BOOL does_round);
 
 #define fp_getc(fp)     MGUI_RWgetc(fp)

src/mybmp/Makefile.am

@@ -1,8 +1,9 @@
-AM_CPPFLAGS = -I$(abs_top_srcdir)/src/include -I$(abs_top_srcdir)/include
+AM_CPPFLAGS = $(WEBP_CFLAGS)
+AM_CPPFLAGS += -I$(abs_top_srcdir)/src/include -I$(abs_top_srcdir)/include
 
 noinst_LTLIBRARIES = libmybmp.la
 
-SRC_FILES = mybmp.c winbmp.c gif.c jpeg.c png12.c png16.c lbm.c pcx.c tga.c
+SRC_FILES = mybmp.c winbmp.c gif.c jpeg.c png12.c png16.c webp.c lbm.c pcx.c tga.c
 
 libmybmp_la_SOURCES = $(SRC_FILES)
 

src/mybmp/mybmp.c

@@ -98,6 +98,9 @@ static BITMAP_TYPE_INFO bitmap_types [MAX_BITMAP_TYPES] =
 #ifdef _MGIMAGE_PNG
    { "png", __mg_init_png, __mg_load_png, __mg_cleanup_png, NULL, __mg_check_png },
 #endif
+#ifdef _MGIMAGE_WEBP
+   { "webp", __mg_init_webp, __mg_load_webp, __mg_cleanup_webp, NULL, __mg_check_webp },
+#endif
 };
 
 /*

src/mybmp/webp.c

@@ -0,0 +1,85 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+//                          IMPORTANT NOTICE
+//
+// The following open source license statement does not apply to any
+// entity in the Exception List published by FMSoft.
+//
+// For more information, please visit:
+//
+// https://www.fmsoft.cn/exception-list
+//
+//////////////////////////////////////////////////////////////////////////////
+/*
+ *   This file is part of MiniGUI, a mature cross-platform windowing
+ *   and Graphics User Interface (GUI) support system for embedded systems
+ *   and smart IoT devices.
+ *
+ *   Copyright (C) 2002~2021, Beijing FMSoft Technologies Co., Ltd.
+ *   Copyright (C) 1998~2002, WEI Yongming
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *   Or,
+ *
+ *   As this program is a library, any link to this program must follow
+ *   GNU General Public License version 3 (GPLv3). If you cannot accept
+ *   GPLv3, you need to be licensed from FMSoft.
+ *
+ *   If you have got a commercial license of this program, please use it
+ *   under the terms and conditions of the commercial license.
+ *
+ *   For more information about the commercial license, please refer to
+ *   <http://www.minigui.com/blog/minigui-licensing-policy/>.
+ */
+/*
+** webp.c: Low-level WebP file read routines (based on LibWebP 0.6)
+**
+** Current maintainer: Wei Yongming
+**
+** Create date: 2021/10/19
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "common.h"
+
+#ifdef _MGIMAGE_WEBP
+#include "gdi.h"
+
+#include <webp/decode.h>
+
+void* __mg_init_webp(MG_RWops *fp, MYBITMAP *mybmp, RGB *pal)
+{
+    return NULL;
+}
+
+void __mg_cleanup_webp(void *init_info)
+{
+}
+
+int __mg_load_webp (MG_RWops *fp, void *init_info, MYBITMAP *my_bmp,
+                CB_ONE_SCANLINE cb, void *context)
+{
+    return ERR_BMP_OK;
+}
+
+BOOL __mg_check_webp (MG_RWops* fp)
+{
+}
+
+#endif /* _MGIMAGE_WEBP */
+