[freetype2] GSoC-2017-kushal 51347b3 13/70: Read PNG function

[Kushal K S V S]

branch: GSoC-2017-kushal
commit 51347b348b99d5734006f7f1a4be67ae0bc0b277
Author: Kushal K S V S <address@hidden>
Commit: Kushal K S V S <address@hidden>

    Read PNG function
---
 tests/make_png/bitmap.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++-
 tests/make_png/bitmap.h |  3 ++-
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/tests/make_png/bitmap.c b/tests/make_png/bitmap.c
index 104acdc..deeff15 100644
--- a/tests/make_png/bitmap.c
+++ b/tests/make_png/bitmap.c
@@ -279,4 +279,68 @@ void Make_PNG(FT_Bitmap* bitmap,char* name,int i,int 
render_mode){
   Generate_PNG (& fruit, file_name, render_mode);
 
   free (fruit.pixels);
-}
\ No newline at end of file
+}
+
+void Read_PNG(char *filename, IMAGE * after_effect) {
+
+  int width, height;
+  png_bytep *row_pointers;
+
+  FILE *fp = fopen(filename, "rb");
+
+  png_structp png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, 
NULL);
+  if(!png) abort();
+
+  png_infop info = png_create_info_struct(png);
+  if(!info) abort();
+
+  if(setjmp(png_jmpbuf(png))) abort();
+
+  png_init_io(png, fp);
+
+  png_set_user_limits(png, 0x7fffffffL, 0x7fffffffL);
+
+  png_read_info(png, info);
+
+  width      = png_get_image_width(png, info);
+  height     = png_get_image_height(png, info);
+
+  after_effect->width = width;
+  after_effect->height = height;
+
+  printf("%d %d\n",width,height );
+
+  row_pointers = (png_bytep*)malloc(sizeof(png_bytep) * height);
+  for(int y = 0; y < height; y++) {
+    row_pointers[y] = (png_byte*)malloc(png_get_rowbytes(png,info));
+  }
+
+  png_read_image(png, row_pointers);
+
+  after_effect->pixels = (PIXEL*)malloc(width * height * sizeof(PIXEL));
+
+  for(int y = 0; y < height; y++) {
+
+    png_bytep row = row_pointers[y];
+
+    for(int x = 0; x < width; x++ ) {
+
+      png_bytep px = &(row[x * 4]);
+
+      PIXEL * pixel = Pixel_At ( after_effect, x, y);
+
+      pixel->red = px[0];
+      pixel->green = px[1];
+      pixel->blue = px[2];
+      pixel->alpha = px[3];
+
+      printf("%d %d %d %d\n", pixel->red,
+                              pixel->green,
+                              pixel->blue,
+                              pixel->alpha );
+    }
+  }
+
+  fclose(fp);
+}
+
diff --git a/tests/make_png/bitmap.h b/tests/make_png/bitmap.h
index 426d622..bed203d 100644
--- a/tests/make_png/bitmap.h
+++ b/tests/make_png/bitmap.h
@@ -64,4 +64,5 @@ PIXEL * Pixel_At (IMAGE * bitmap, int x, int y);  // Returns 
a pointer to pixel
 void Make_PNG(FT_Bitmap* bitmap,char* name,int i,int render_mode);
 // Image to file  
 int Generate_PNG (IMAGE *bitmap, const char *path,int render_mode);  
-
+// Read PNG
+void Read_PNG(char *filename, IMAGE * after_effect);