added tga.h/.cpp at util/imgfmt

inc/hgl/util/imgfmt/tga.h

@@ -0,0 +1,46 @@
+#ifndef HGL_UTIL_IMAGE_FILE_TGA_INCLUDE
+#define HGL_UTIL_IMAGE_FILE_TGA_INCLUDE
+
+#include<hgl/platform/Platform.h>
+namespace hgl
+{
+    namespace util
+    {
+#pragma pack(push,1)
+        struct TGAHeader
+        {
+            uint8 id;
+            uint8 color_map_type;
+            uint8 image_type;               // 1 colormap image ,2 true-color,3 grayscale
+
+            uint16 color_map_first;
+            uint16 color_map_length;
+            uint8 color_map_size;
+
+            uint16 x_origin;
+            uint16 y_origin;
+
+            uint16 width;
+            uint16 height;
+            uint8 bit;
+            uint8 image_desc;
+        };
+
+        union TGAImageDesc
+        {
+            uint8 image_desc;
+            struct
+            {
+                uint alpha_depth:4;
+                uint reserved:1;
+                uint direction:1;       //0 lower-left,1 upper left
+            };
+        };
+#pragma pack(pop)
+
+        constexpr size_t TGAHeaderSize=sizeof(TGAHeader);
+
+        bool FillTGAHeader(TGAHeader *header,const uint16 width,const uint16 height,const uint8 channels);
+    }//namespace util
+}//namespace hgl
+#endif//HGL_UTIL_IMAGE_FILE_TGA_INCLUDE

src/CMakeLists.txt

@@ -78,9 +78,15 @@ SET(DATABLOCK_SOURCE    ${CMUTIL_ROOT_INCLUDE_PATH}/hgl/util/datablock/DataBlock
 
 source_group("Data Block" FILES ${DATABLOCK_SOURCE})
 
+SET(IMG_FILE_FILES  ${CMUTIL_ROOT_INCLUDE_PATH}/hgl/util/imgfmt/tga.h
+                    imgfmt/tga.cpp)
+
+source_group("Image Format" FILES ${IMG_FILE_FILES})
+
 add_cm_library(CMUtil "CM"	${CMD_SOURCE}
 #							${TIME_SOURCE}
 #                            ${DATABLOCK_SOURCE}
+                            ${IMG_FILE_FILES}
 
                             ${XML_PARSE_SOURCE}
                             ${JSON_TOOL_SOURCE}

src/imgfmt/tga.cpp

@@ -0,0 +1,40 @@
+#include<hgl/util/imgfmt/tga.h>
+
+namespace hgl
+{
+    namespace util
+    {   
+        bool FillTGAHeader(TGAHeader *header,const uint16 width,const uint16 height,const uint8 channels)
+        {
+            if(!header)return(false);
+            if(!width||!height)return(false);
+
+            if(channels!=1
+             &&channels!=3
+             &&channels!=4)return(false);
+
+            memset(header,0,sizeof(TGAHeader));
+
+            TGAImageDesc desc;
+
+            desc.image_desc=0;
+            
+            if(channels==1)
+            {
+                header->image_type=3;
+                header->bit=8;
+            }
+            else
+            {
+                header->image_type=2;
+                header->bit=channels*8;
+
+                if(channels==4)
+                    desc.alpha_depth=8;
+            }
+
+            header->image_desc=desc.image_desc;
+            return(true);
+        }
+    }//namespace util
+}//namespace hgl