[cmake] build using external lodepng

cmake/Findlodepng.cmake

@@ -0,0 +1,19 @@
+# - Try to find lodepng
+# Once done this will define
+#  lodepng_FOUND - cJSON was found
+#  lodepng_INCLUDE_DIRS - cJSON include directories
+#  lodepng_LIBRARIES - cJSON libraries for linking
+
+find_path(lodepng_INCLUDE_DIR
+    NAMES lodepng.h)
+
+find_library(lodepng_LIBRARY
+    NAMES lodepng)
+
+if (lodepng_INCLUDE_DIR AND lodepng_LIBRARY)
+    set(lodepng_FOUND ON)
+    set(lodepng_INCLUDE_DIRS ${lodepng_INCLUDE_DIR})
+    set(lodepng_LIBRARIES ${lodepng_LIBRARY})
+endif()
+
+mark_as_advanced(lodepng_INCLUDE_DIRS lodepng_LIBRARIES)

winpr/libwinpr/utils/CMakeLists.txt

@@ -35,10 +35,6 @@ set(COLLECTIONS_SRCS
 	collections/MessageQueue.c
 	collections/MessagePipe.c)
 
-set(LODEPNG_SRCS
-	lodepng/lodepng.c
-	lodepng/lodepng.h)
-
 if (WINPR_HAVE_SYSLOG_H)
 	set(SYSLOG_SRCS
 		wlog/SyslogAppender.c
@@ -142,14 +138,22 @@ endif()
 
 winpr_module_add(${SRCS}
 	${COLLECTIONS_SRCS}
-	${LODEPNG_SRCS}
 	${WLOG_SRCS}
 	${ASN1_SRCS}
 )
 
 winpr_include_directory_add(
-	"lodepng"
-	".")
+	"."
+)
+
+option(WITH_LODEPNG "build WinPR with PNG support" OFF)
+if (WITH_LODEPNG)
+	find_package(lodepng REQUIRED)
+
+	winpr_definition_add(-DWITH_LODEPNG)
+	winpr_include_directory_add(${lodepng_INCLUDE_DIRS})
+	winpr_library_add_private(${lodepng_LIBRARIES})
+endif()
 
 if(OPENSSL_FOUND)
 	winpr_include_directory_add(${OPENSSL_INCLUDE_DIR})

winpr/libwinpr/utils/image.c

@@ -27,7 +27,9 @@
 
 #include <winpr/image.h>
 
-#include "lodepng/lodepng.h"
+#if defined(WITH_LODEPNG)
+#include <lodepng.h>
+#endif
 #include <winpr/stream.h>
 
 #include "../log.h"
@@ -205,16 +207,18 @@ int winpr_image_write(wImage* image, const char* filename)
 		status = winpr_bitmap_write(filename, image->data, image->width, image->height,
 		                            image->bitsPerPixel);
 	}
+#if defined(WITH_LODEPNG)
 	else
 	{
 		unsigned lodepng_status;
 		lodepng_status = lodepng_encode32_file(filename, image->data, image->width, image->height);
 		status = (lodepng_status) ? -1 : 1;
 	}
-
+#endif
 	return status;
 }
 
+#if defined(WITH_LODEPNG)
 static int winpr_image_png_read_fp(wImage* image, FILE* fp)
 {
 	INT64 size;
@@ -269,6 +273,7 @@ static int winpr_image_png_read_buffer(wImage* image, const BYTE* buffer, size_t
 	image->scanline = image->bytesPerPixel * image->width;
 	return 1;
 }
+#endif
 
 static int winpr_image_bitmap_read_fp(wImage* image, FILE* fp)
 {
@@ -463,12 +468,14 @@ int winpr_image_read(wImage* image, const char* filename)
 		image->type = WINPR_IMAGE_BITMAP;
 		status = winpr_image_bitmap_read_fp(image, fp);
 	}
+#if defined(WITH_LODEPNG)
 	else if ((sig[0] == 0x89) && (sig[1] == 'P') && (sig[2] == 'N') && (sig[3] == 'G') &&
 	         (sig[4] == '\r') && (sig[5] == '\n') && (sig[6] == 0x1A) && (sig[7] == '\n'))
 	{
 		image->type = WINPR_IMAGE_PNG;
 		status = winpr_image_png_read_fp(image, fp);
 	}
+#endif
 
 	fclose(fp);
 	return status;
@@ -489,12 +496,14 @@ int winpr_image_read_buffer(wImage* image, const BYTE* buffer, size_t size)
 		image->type = WINPR_IMAGE_BITMAP;
 		status = winpr_image_bitmap_read_buffer(image, buffer, size);
 	}
+#if defined(WITH_LODEPNG)
 	else if ((sig[0] == 0x89) && (sig[1] == 'P') && (sig[2] == 'N') && (sig[3] == 'G') &&
 	         (sig[4] == '\r') && (sig[5] == '\n') && (sig[6] == 0x1A) && (sig[7] == '\n'))
 	{
 		image->type = WINPR_IMAGE_PNG;
 		status = winpr_image_png_read_buffer(image, buffer, size);
 	}
+#endif
 
 	return status;
 }