optimization: cut off file dependencies.

we should avoid code insertion during file dependencies,
such as #include "xxx.h" which has implementations.

This could increase binary size, we can avoid it as possible.

Current patch improves binary size like this:

From: file(2059008) = text(120360) data(8096) bss(80) dec(128536)
To  : file(1921832) = text(118429) data(7872) bss(56) dec(126357)

More additional patches will come in to optmize binary size.

src/lib/sw_engine/tvgSwCommon.h

@@ -23,6 +23,7 @@
 #define _TVG_SW_COMMON_H_
 
 #include "tvgCommon.h"
+#include "tvgRender.h"
 
 #ifdef THORVG_AVX_VECTOR_SUPPORT
     #include <immintrin.h>

src/lib/sw_engine/tvgSwFill.cpp

@@ -19,6 +19,8 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
+#include <float.h>
+#include <math.h>
 #include "tvgSwCommon.h"
 
 

src/lib/sw_engine/tvgSwRaster.cpp

@@ -20,6 +20,7 @@
  * SOFTWARE.
  */
 #include "tvgSwCommon.h"
+#include "tvgRender.h"
 
 /************************************************************************/
 /* Internal Class Implementation                                        */

src/lib/sw_engine/tvgSwRenderer.cpp

@@ -20,6 +20,7 @@
  * SOFTWARE.
  */
 #include "tvgSwCommon.h"
+#include "tvgTaskScheduler.h"
 #include "tvgSwRenderer.h"
 
 /************************************************************************/

src/lib/sw_engine/tvgSwRenderer.h

@@ -22,6 +22,9 @@
 #ifndef _TVG_SW_RENDERER_H_
 #define _TVG_SW_RENDERER_H_
 
+#include <vector>
+#include "tvgRender.h"
+
 struct SwSurface;
 struct SwTask;
 

src/lib/sw_engine/tvgSwRle.cpp

@@ -22,6 +22,7 @@
 #include <setjmp.h>
 #include <limits.h>
 #include <memory.h>
+
 #include "tvgSwCommon.h"
 
 /************************************************************************/

src/lib/sw_engine/tvgSwShape.cpp

@@ -19,7 +19,9 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
+#include <math.h>
 #include "tvgSwCommon.h"
+#include "tvgBezier.h"
 
 /************************************************************************/
 /* Internal Class Implementation                                        */

src/lib/sw_engine/tvgSwStroke.cpp

@@ -19,6 +19,8 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
+#include <string.h>
+#include <math.h>
 #include "tvgSwCommon.h"
 
 

src/lib/tvgBezier.cpp

@@ -19,8 +19,9 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#include "tvgCommon.h"
-
+#include <float.h>
+#include <math.h>
+#include "tvgBezier.h"
 
 /************************************************************************/
 /* Internal Class Implementation                                        */

src/lib/tvgBezier.h

@@ -22,6 +22,8 @@
 #ifndef _TVG_BEZIER_H_
 #define _TVG_BEZIER_H_
 
+#include "tvgCommon.h"
+
 namespace tvg
 {
 

src/lib/tvgCanvas.cpp

@@ -19,7 +19,6 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#include "tvgCommon.h"
 #include "tvgCanvasImpl.h"
 
 /************************************************************************/

src/lib/tvgCanvasImpl.h

@@ -22,6 +22,7 @@
 #ifndef _TVG_CANVAS_IMPL_H_
 #define _TVG_CANVAS_IMPL_H_
 
+#include <vector>
 #include "tvgPaint.h"
 
 /************************************************************************/

src/lib/tvgCommon.h

@@ -23,15 +23,6 @@
 #define _TVG_COMMON_H_
 
 #include "config.h"
-
-#include <iostream>
-#include <vector>
-#include <math.h>
-#include <float.h>
-#include <string.h>
-#include <memory>
-#include <future>
-
 #include "thorvg.h"
 
 using namespace std;
@@ -42,10 +33,4 @@ using namespace tvg;
 
 #define TVG_UNUSED __attribute__ ((__unused__))
 
-#include "tvgBezier.h"
-#include "tvgLoader.h"
-#include "tvgLoaderMgr.h"
-#include "tvgRender.h"
-#include "tvgTaskScheduler.h"
-
 #endif //_TVG_COMMON_H_

src/lib/tvgFill.h

@@ -22,6 +22,7 @@
 #ifndef _TVG_FILL_H_
 #define _TVG_FILL_H_
 
+#include <string.h>
 #include "tvgCommon.h"
 
 template<typename T>

src/lib/tvgGlCanvas.cpp

@@ -19,7 +19,6 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#include "tvgCommon.h"
 #include "tvgCanvasImpl.h"
 
 #ifdef THORVG_GL_RASTER_SUPPORT

src/lib/tvgInitializer.cpp

@@ -20,6 +20,7 @@
  * SOFTWARE.
  */
 #include "tvgCommon.h"
+#include "tvgTaskScheduler.h"
 #include "tvgLoaderMgr.h"
 
 #ifdef THORVG_SW_RASTER_SUPPORT

src/lib/tvgLinearGradient.cpp

@@ -19,6 +19,8 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
+#include <float.h>
+#include <math.h>
 #include "tvgFill.h"
 
 /************************************************************************/

src/lib/tvgLoader.h

@@ -22,6 +22,8 @@
 #ifndef _TVG_LOADER_H_
 #define _TVG_LOADER_H_
 
+#include "tvgCommon.h"
+
 namespace tvg
 {
 

src/lib/tvgLoaderMgr.cpp

@@ -19,7 +19,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#include "tvgCommon.h"
+#include "tvgLoaderMgr.h"
 
 #ifdef THORVG_SVG_LOADER_SUPPORT
     #include "tvgSvgLoader.h"

src/lib/tvgLoaderMgr.h

@@ -22,6 +22,8 @@
 #ifndef _TVG_LOADER_MGR_H_
 #define _TVG_LOADER_MGR_H_
 
+#include "tvgLoader.h"
+
 struct LoaderMgr
 {
     static bool init();

src/lib/tvgPaint.h

@@ -22,7 +22,9 @@
 #ifndef _TVG_PAINT_H_
 #define _TVG_PAINT_H_
 
-#include "tvgCommon.h"
+#include <float.h>
+#include <math.h>
+#include "tvgRender.h"
 
 namespace tvg
 {

src/lib/tvgPictureImpl.h

@@ -23,6 +23,7 @@
 #define _TVG_PICTURE_IMPL_H_
 
 #include "tvgPaint.h"
+#include "tvgLoaderMgr.h"
 
 /************************************************************************/
 /* Internal Class Implementation                                        */

src/lib/tvgRadialGradient.cpp

@@ -19,6 +19,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
+#include <float.h>
 #include "tvgFill.h"
 
 /************************************************************************/

src/lib/tvgRender.cpp

@@ -19,7 +19,9 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#include "tvgCommon.h"
+#include <float.h>
+#include <math.h>
+#include "tvgRender.h"
 
 /************************************************************************/
 /* Internal Class Implementation                                        */

src/lib/tvgRender.h

@@ -22,6 +22,8 @@
 #ifndef _TVG_RENDER_H_
 #define _TVG_RENDER_H_
 
+#include "tvgCommon.h"
+
 namespace tvg
 {
 

src/lib/tvgSceneImpl.h

@@ -22,6 +22,7 @@
 #ifndef _TVG_SCENE_IMPL_H_
 #define _TVG_SCENE_IMPL_H_
 
+#include <vector>
 #include "tvgPaint.h"
 
 /************************************************************************/

src/lib/tvgShape.cpp

@@ -20,7 +20,6 @@
  * SOFTWARE.
  */
 #include <limits>
-
 #include "tvgShapeImpl.h"
 
 /************************************************************************/

src/lib/tvgShapePath.h

@@ -22,6 +22,7 @@
 #ifndef _TVG_SHAPE_PATH_H_
 #define _TVG_SHAPE_PATH_H_
 
+#include <string.h>
 #include "tvgCommon.h"
 
 /************************************************************************/

src/lib/tvgSwCanvas.cpp

@@ -19,7 +19,6 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#include "tvgCommon.h"
 #include "tvgCanvasImpl.h"
 
 #ifdef THORVG_SW_RASTER_SUPPORT

src/lib/tvgTaskScheduler.cpp

@@ -21,7 +21,8 @@
  */
 #include <deque>
 #include <thread>
-#include "tvgCommon.h"
+#include <vector>
+#include "tvgTaskScheduler.h"
 
 /************************************************************************/
 /* Internal Class Implementation                                        */

src/lib/tvgTaskScheduler.h

@@ -22,6 +22,7 @@
 #ifndef _TVG_TASK_SCHEDULER_H_
 #define _TVG_TASK_SCHEDULER_H_
 
+#include <future>
 #include "tvgCommon.h"
 
 namespace tvg

src/loaders/svg/tvgSimpleXmlParser.cpp

@@ -20,6 +20,10 @@
  * SOFTWARE.
  */
 
+#include <ctype.h>
+#include <cstring>
+#include <alloca.h>
+
 #include "tvgSimpleXmlParser.h"
 
 static const char* _simpleXmlFindWhiteSpace(const char* itr, const char* itrEnd)

src/loaders/svg/tvgSimpleXmlParser.h

@@ -23,9 +23,7 @@
 #ifndef _TVG_SIMPLE_XML_PARSER_H_
 #define _TVG_SIMPLE_XML_PARSER_H_
 
-#include <ctype.h>
-#include <cstring>
-#include <alloca.h>
+#include "tvgSvgLoaderCommon.h"
 
 enum class SimpleXMLType
 {

src/loaders/svg/tvgSvgLoader.cpp

@@ -21,9 +21,13 @@
  */
 #include <stddef.h>
 #include <fstream>
+#include <string.h>
+#include <float.h>
+#include <math.h>
+#include "tvgLoaderMgr.h"
+#include "tvgSimpleXmlParser.h"
 #include "tvgSvgLoader.h"
 
-
 /************************************************************************/
 /* Internal Class Implementation                                        */
 /************************************************************************/

src/loaders/svg/tvgSvgLoader.h

@@ -22,7 +22,7 @@
 #ifndef _TVG_SVG_LOADER_H_
 #define _TVG_SVG_LOADER_H_
 
-#include "tvgSvgLoaderCommon.h"
+#include "tvgTaskScheduler.h"
 #include "tvgSvgSceneBuilder.h"
 
 class SvgLoader : public Loader, public Task

src/loaders/svg/tvgSvgLoaderCommon.h

@@ -23,7 +23,6 @@
 #define _TVG_SVG_LOADER_COMMON_H_
 
 #include "tvgCommon.h"
-#include "tvgSimpleXmlParser.h"
 
 enum class SvgNodeType
 {

src/loaders/svg/tvgSvgPath.cpp

@@ -19,9 +19,10 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
+#include <string.h>
+#include <math.h>
 #include "tvgSvgPath.h"
 
-
 static char* _skipComma(const char* content)
 {
     while (*content && isspace(*content)) {

src/loaders/svg/tvgSvgPath.h

@@ -23,7 +23,8 @@
 #ifndef _TVG_SVG_PATH_H_
 #define _TVG_SVG_PATH_H_
 
-#include "tvgCommon.h"
+#include <vector>
+#include "tvgSvgLoaderCommon.h"
 
 tuple<vector<tvg::PathCommand>, vector<tvg::Point>> svgPathToTvgPath(const char* svg_path_data);
 

src/loaders/svg/tvgSvgSceneBuilder.cpp

@@ -19,7 +19,9 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
+#include <math.h>
 #include "tvgSvgSceneBuilder.h"
+#include "tvgSvgPath.h"
 
 unique_ptr<LinearGradient> _applyLinearGradientProperty(SvgStyleGradient* g, Shape* vg, float rx, float ry, float rw, float rh)
 {

src/loaders/svg/tvgSvgSceneBuilder.h

@@ -24,7 +24,6 @@
 #define _TVG_SVG_SCENE_BUILDER_H_
 
 #include "tvgSvgLoaderCommon.h"
-#include "tvgSvgPath.h"
 
 class SvgSceneBuilder
 {