changes in bmp api

[my-code/api.git] / bmp / bmp.c

diff --git a/bmp/bmp.c b/bmp/bmp.c
index 4d8c7ac..d42eefd 100644 (file)
--- a/bmp/bmp.c
+++ b/bmp/bmp.c
@@ -30,6 +30,9 @@ int bmp_shutdown(t_bmp *bmp) {
 
 int bmp_check_header_and_info(t_bmp *bmp) {
 
+  dprintf(bmp->outfd,"[bmp] magic identifier: %c%c\n",
+          bmp->hdr.identifier&0xff,bmp->hdr.identifier>>8);
+
   if(bmp->info.compression!=0) {
     dprintf(bmp->outfd,"[bmp] compression not supported\n");
     return B_NO_SUPPORT;
@@ -40,9 +43,9 @@ int bmp_check_header_and_info(t_bmp *bmp) {
     return B_NO_SUPPORT;
   }
     
-  if(bmp->hdr.offset!=B_H_SIZE+B_I_SIZE) {
+  if(bmp->hdr.offset!=BMP_H_SIZE+BMP_I_SIZE) {
     dprintf(bmp->outfd,"[bmp] files with %d bytes offset not supported\n",
-            bmp->hdr-offset);
+            bmp->hdr.offset);
     return B_NO_SUPPORT;
   }
 
@@ -55,9 +58,29 @@ int bmp_check_header_and_info(t_bmp *bmp) {
   return B_SUCCESS;
 }
 
+int bmp_alloc_map(t_bmp *bmp) {
+
+  int size;
+
+  size=bmp->width*bmp->height*3;
+
+  dprintf(bmp->outfd,"[bmp] alloc map memory (%d bytes)\n",size);
+
+  if((bmp->map=(t_pixel *)malloc(size))==NULL) {
+    dprintf(bmp->outfd,"[bmp] memory map alloc failed\n");
+    return B_E_MEM;
+  }
+
+  return B_SUCCESS;
+}
+
 int bmp_write_file(t_bmp *bmp) {
  
   int fill,xsize,size;
+  int y;
+  unsigned char buf[3];
+
+  memset(buf,0,3);
 
   if(!(bmp->mode&WRITE)) {
     dprintf(bmp->outfd,"[bmp] write mode not specified\n");
@@ -84,7 +107,7 @@ int bmp_write_file(t_bmp *bmp) {
   bmp->info.ic=0;
 
   /* write it */
-  if((bmp->fd=open(bmp->file,O_WRONLY)<0) {
+  if((bmp->fd=open(bmp->file,O_WRONLY|O_CREAT))<0) {
     dprintf(bmp->outfd,"[bmp] unable to open file %s\n",bmp->file);
     return B_NO_FILE;
   }
@@ -99,19 +122,54 @@ int bmp_write_file(t_bmp *bmp) {
     return B_E_WRITE_DATA;
   }
 
+  for(y=0;y<bmp->height;y++) {
+    if(write(bmp->fd,bmp->map+y*bmp->width,xsize)<xsize) {
+      dprintf(bmp->outfd,"[bmp] unable to write image data line %d\n",y);
+      return B_E_WRITE_DATA;
+    }
+    if(write(bmp->fd,buf,fill)<fill) {
+      dprintf(bmp->outfd,"[bmp] unable to write fill bytes\n");
+      return B_E_WRITE_DATA;
+    }
+  }
+
+  close(bmp->fd);
+
+  return B_SUCCESS;
+}
+
+int bmp_cut_bottom(t_bmp *dst,t_bmp *src,int dz) {
+
+  int off;
+
+  dst->width=src->width;
+  dst->height=dz;
+
+  if(dz>src->height) {
+    dprintf(src->outfd,"[bmp] cut region greater than image height\n");
+    return B_E_GEOMETRY;
+  }
+
+  if(bmp_alloc_map(dst)!=B_SUCCESS) {
+    dprintf(dst->outfd,"[bmp] no map memory\n");
+    return B_E_MEM;
+  }
+
+  off=(src->height-dz-1)*src->width;
+  printf("debug: off = %d height = %d dz = %d\n",off,src->height,dz);
+  memcpy(dst->map,&(src->map[off]),dz*src->width*sizeof(t_pixel));
 
   return B_SUCCESS;
 }
 
 int bmp_read_file(t_bmp *bmp) {
 
-  unsigned char buf[BMP_HI_SIZE];
+  unsigned char buf[BMP_H_SIZE+BMP_I_SIZE];
   int y,xsize;
   int crop;
-  unsigned char *data;
 
   if(!(bmp->mode&READ)) {
-    dprintf(bmp->outfd,"[bmp] read mode not specified");
+    dprintf(bmp->outfd,"[bmp] read mode not specified\n");
     return B_WRONG_MODE;
   }
 
@@ -133,17 +191,20 @@ int bmp_read_file(t_bmp *bmp) {
     return B_HI_FAIL;
   }
 
-  bmp->map=(t_pixel *)malloc(bmp->info.width*bmp->info.height*sizeof(t_pixel));
+  bmp->width=bmp->info.width;
+  bmp->height=bmp->info.height;
+
+  bmp->map=(t_pixel *)malloc(bmp->width*bmp->height*sizeof(t_pixel));
   if(bmp->map==NULL) {
     dprintf(bmp->outfd,"[bmp] malloc of map memory failed\n");
     return B_E_MEM;
   }
 
-  crop=(bmp->info.imagesize/bmp->info.height)%4;
-  xsize=(bmp->info.bpp/8)*bmp->info.width;
+  crop=bmp->info.imagesize/bmp->height-bmp->width*(bmp->info.bpp/8);
+  xsize=(bmp->info.bpp/8)*bmp->width;
 
-  for(y=0;y<bmp->info.height;y++) {
-    if(read(bmp->fd,bmp->map+y*bmp->info.width,xsize)<xsize) {
+  for(y=0;y<bmp->height;y++) {
+    if(read(bmp->fd,bmp->map+y*bmp->width,xsize)<xsize) {
       dprintf(bmp->outfd,"[bmp] reading image data of line %d failed\n",y);
       return B_E_READ_DATA;
     }