add png image

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@112 bbd45198-f89e-11dd-88c7-29a3b14d5316

rtgui/common/image_png.c

+#include "libpng/png.h"
+#include <rtthread.h>
+#include <rtgui/image_png.h>
+#include <rtgui/rtgui_system.h>
+
+#define PNG_MAGIC_LEN       8
+
+struct rtgui_image_png
+{
+	rt_bool_t is_loaded;
+
+	struct rtgui_filerw* filerw;
+
+	/* png image information */
+	png_structp png_ptr;
+	png_infop info_ptr;
+
+	rt_uint8_t *pixels;
+	rt_uint8_t *line_pixels;
+};
+
+static rt_bool_t rtgui_image_png_check(struct rtgui_filerw* file);
+static rt_bool_t rtgui_image_png_load(struct rtgui_image* image, struct rtgui_filerw* file, rt_bool_t load);
+static void rtgui_image_png_unload(struct rtgui_image* image);
+static void rtgui_image_png_blit(struct rtgui_image* image, struct rtgui_dc* dc, struct rtgui_rect* rect);
+
+struct rtgui_image_engine rtgui_image_png_engine =
+{
+	"png",
+	{ RT_NULL },
+	rtgui_image_png_check,
+	rtgui_image_png_load,
+	rtgui_image_png_unload,
+	rtgui_image_png_blit
+};
+
+static void rtgui_image_png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+	struct rtgui_filerw* filerw = (struct rtgui_filerw*)png_ptr->io_ptr;
+
+	rtgui_filerw_read(filerw, data, length, 1);
+}
+
+static rt_bool_t rtgui_image_png_process(png_structp png_ptr, png_infop info_ptr, struct rtgui_image_png* png)
+{
+    int x, y;
+    png_bytep row;
+    png_bytep data;
+    rtgui_color_t *ptr;
+
+	row = (png_bytep) rtgui_malloc (png_get_rowbytes(png_ptr, info_ptr));
+	if (row == RT_NULL) return RT_FALSE;
+
+    ptr = (rtgui_color_t *)png->pixels;
+
+    switch (info_ptr->color_type)
+    {
+        case PNG_COLOR_TYPE_RGBA:
+            for (y = 0; y < info_ptr->height; y++)
+            {
+				png_read_row(png_ptr, row, png_bytep_NULL);
+                for (x = 0; x < info_ptr->width; x++)
+                {
+                    data = &(row[x * 4]);
+
+                    ptr[x+y*info_ptr->width] = RTGUI_ARGB((255 - data[3]), data[0], data[1], data[2]);
+                }
+            }
+
+            break;
+
+        case PNG_COLOR_TYPE_PALETTE:
+            for (y = 0; y < info_ptr->height; y++)
+            {
+				png_read_row(png_ptr, row, png_bytep_NULL);
+                for (x = 0; x < info_ptr->width; x++)
+                {
+                    data = &(row[x]);
+
+					ptr[x] = RTGUI_ARGB(0, info_ptr->palette[data[0]].red,
+						info_ptr->palette[data[0]].green,
+						info_ptr->palette[data[0]].blue);
+                }
+            }
+
+        default:
+            break;
+    };
+
+    rtgui_free(row);
+
+    return RT_TRUE;
+}
+
+static rt_bool_t rtgui_image_png_check(struct rtgui_filerw* file)
+{
+	int start;
+	rt_bool_t is_PNG;
+	rt_uint8_t magic[4];
+
+	if ( !file ) return 0;
+
+	start = rtgui_filerw_tell(file);
+
+	/* move to the begining of file */
+	rtgui_filerw_seek(file, 0, SEEK_SET);
+
+	is_PNG = RT_FALSE;
+	if ( rtgui_filerw_read(file, magic, 1, sizeof(magic)) == sizeof(magic) )
+	{
+		if ( magic[0] == 0x89 &&
+				magic[1] == 'P' &&
+				magic[2] == 'N' &&
+				magic[3] == 'G' )
+		{
+			is_PNG = RT_TRUE;
+		}
+	}
+	rtgui_filerw_seek(file, start, SEEK_SET);
+
+	return(is_PNG);
+}
+
+static rt_bool_t rtgui_image_png_load(struct rtgui_image* image, struct rtgui_filerw* file, rt_bool_t load)
+{
+	png_uint_32 width;
+	png_uint_32 height;
+	int bit_depth;
+	int color_type;
+	double gamma;
+	struct rtgui_image_png* png;
+
+	png = (struct rtgui_image_png*) rtgui_malloc(sizeof(struct rtgui_image_png));
+	png->png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+	if (png->png_ptr == RT_NULL)
+	{
+		rtgui_free(png);
+		return RT_FALSE;
+	}
+
+	png->info_ptr = png_create_info_struct(png->png_ptr);
+	if (png->info_ptr == RT_NULL)
+	{
+		png_destroy_read_struct(&png->png_ptr, NULL, NULL);
+		rtgui_free(png);
+		return RT_FALSE;
+	}
+
+	png->filerw = file;
+	png_set_read_fn (png->png_ptr, png->filerw, rtgui_image_png_read_data);
+
+	png_read_info(png->png_ptr, png->info_ptr);
+	png_get_IHDR(png->png_ptr, png->info_ptr, &width, &height, &bit_depth,
+		&color_type, NULL, NULL, NULL);
+
+	/* set image information */
+	image->w = width; image->h = height;
+	image->engine = &rtgui_image_png_engine;
+	image->data = png;
+
+	if (bit_depth == 16)
+		png_set_strip_16(png->png_ptr);
+	if (color_type == PNG_COLOR_TYPE_PALETTE)
+		png_set_expand(png->png_ptr);
+	if (bit_depth < 8)
+		png_set_expand(png->png_ptr);
+	if (png_get_valid(png->png_ptr, png->info_ptr, PNG_INFO_tRNS))
+		png_set_expand(png->png_ptr);
+	if (color_type == PNG_COLOR_TYPE_GRAY ||
+		color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+		png_set_gray_to_rgb(png->png_ptr);
+
+	/* Ignore background color */
+
+	/* set gamma conversion */
+	if (png_get_gAMA(png->png_ptr, png->info_ptr, &gamma))
+		png_set_gamma(png->png_ptr, (double)2.2, gamma);
+
+	png_read_update_info(png->png_ptr, png->info_ptr);
+
+	if (load == RT_TRUE)
+	{
+		/* load all pixels */
+		png->pixels = rtgui_malloc(image->w * image->h * sizeof(rtgui_color_t));
+		png->line_pixels = RT_NULL;
+
+		rtgui_image_png_process(png->png_ptr, png->info_ptr, png);
+	}
+	else
+	{
+		png->line_pixels = rtgui_malloc(image->w * sizeof(rtgui_color_t));
+		png->pixels = RT_NULL;
+	}
+}
+
+static void rtgui_image_png_unload(struct rtgui_image* image)
+{
+	struct rtgui_image_png* png;
+
+	if (image != RT_NULL)
+	{
+		png = (struct rtgui_image_png*) image->data;
+
+		png_read_end(png->png_ptr, NULL);
+
+		/* destroy png struct */
+		png_destroy_info_struct(png->png_ptr, &png->info_ptr);
+		png_destroy_read_struct(&png->png_ptr, NULL, NULL);
+
+		if (png->pixels != RT_NULL) rtgui_free(png->pixels);
+		if (png->line_pixels != RT_NULL) rtgui_free(png->line_pixels);
+
+		/* release data */
+		rtgui_free(png);
+	}
+}
+
+static void rtgui_image_png_blit(struct rtgui_image* image, struct rtgui_dc* dc, struct rtgui_rect* rect)
+{
+	rt_uint16_t x, y;
+	rtgui_color_t* ptr;
+	rtgui_color_t foreground;
+	struct rtgui_image_png* png;
+
+	RT_ASSERT(image != RT_NULL && dc != RT_NULL && rect != RT_NULL);
+	RT_ASSERT(image->data != RT_NULL);
+
+	png = (struct rtgui_image_png*) image->data;
+	ptr = png->pixels;
+
+	/* save foreground color */
+	foreground = rtgui_dc_get_color(dc);
+
+	/* draw each point within dc */
+	for (y = 0; y < image->h; y ++)
+	{
+		for (x = 0; x < image->w; x++)
+		{
+			/* not alpha */
+			if ((*ptr >> 24) != 255)
+			{
+				rtgui_dc_set_color(dc, *ptr);
+				rtgui_dc_draw_point(dc, x + rect->x1, y + rect->y1);
+			}
+
+			/* move to next color buffer */
+			ptr ++;
+		}
+	}
+
+	/* restore foreground */
+	rtgui_dc_set_color(dc, foreground);
+}
+
+void rtgui_image_png_init()
+{
+	/* register jpeg on image system */
+	rtgui_image_register_engine(&rtgui_image_png_engine);
+}

rtgui/common/libpng/Makefile

+RTGUI_ROOT=../..
+
+include $(RTGUI_ROOT)/config.mk
+
+SRC	= png.c pngerror.c pnggccrd.c pngget.c pngmem.c pngpread.c pngread.c \
+	pngrio.c pngrtran.c pngrutil.c pngset.c pngtrans.c pngvcrd.c pngwio.c \
+	pngwrite.c pngwtran.c pngwutil.c
+CFLAGS	+= -I../libz
+
+OBJ	= $(SRC:.c=.o) 
+LIB	= libpng.a
+
+all: $(LIB)
+
+$(LIB): $(OBJ)
+	$(AR) r $@ $?
+	$(RANLIB) $@
+
+clean :
+	$(RM) *.o *~ *.bak
+	$(RM) $(LIB)
+	$(RM) .depend
+
+dep : .depend
+
+include .depend
+
+.depend: $(SRC)
+	$(CC) $(CFLAGS) -M $^ > $@

rtgui/common/libpng/pngerror.c

+
+/* pngerror.c - stub functions for i/o and memory allocation
+ *
+ * Last changed in libpng 1.2.13 November 13, 2006
+ * For conditions of distribution and use, see copyright notice in png.h
+ * Copyright (c) 1998-2006 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This file provides a location for all error handling.  Users who
+ * need special error handling are expected to write replacement functions
+ * and use png_set_error_fn() to use those functions.  See the instructions
+ * at each function.
+ */
+
+#define PNG_INTERNAL
+#include "png.h"
+
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+static void /* PRIVATE */
+png_default_error PNGARG((png_structp png_ptr,
+  png_const_charp error_message));
+static void /* PRIVATE */
+png_default_warning PNGARG((png_structp png_ptr,
+  png_const_charp warning_message));
+
+/* This function is called whenever there is a fatal error.  This function
+ * should not be changed.  If there is a need to handle errors differently,
+ * you should supply a replacement error function and use png_set_error_fn()
+ * to replace the error function at run-time.
+ */
+void PNGAPI
+png_error(png_structp png_ptr, png_const_charp error_message)
+{
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   char msg[16];
+   if (png_ptr != NULL)
+   {
+     if (png_ptr->flags&
+       (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+     {
+       if (*error_message == '#')
+       {
+           int offset;
+           for (offset=1; offset<15; offset++)
+              if (*(error_message+offset) == ' ')
+                  break;
+           if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+           {
+              int i;
+              for (i=0; i<offset-1; i++)
+                 msg[i]=error_message[i+1];
+              msg[i]='\0';
+              error_message=msg;
+           }
+           else
+              error_message+=offset;
+       }
+       else
+       {
+           if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+           {
+              msg[0]='0';
+              msg[1]='\0';
+              error_message=msg;
+           }
+       }
+     }
+   }
+#endif
+   if (png_ptr != NULL && png_ptr->error_fn != NULL)
+      (*(png_ptr->error_fn))(png_ptr, error_message);
+
+   /* If the custom handler doesn't exist, or if it returns,
+      use the default handler, which will not return. */
+   png_default_error(png_ptr, error_message);
+}
+
+/* This function is called whenever there is a non-fatal error.  This function
+ * should not be changed.  If there is a need to handle warnings differently,
+ * you should supply a replacement warning function and use
+ * png_set_error_fn() to replace the warning function at run-time.
+ */
+void PNGAPI
+png_warning(png_structp png_ptr, png_const_charp warning_message)
+{
+   int offset = 0;
+   if (png_ptr != NULL)
+   {
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (png_ptr->flags&
+     (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+#endif
+     {
+       if (*warning_message == '#')
+       {
+           for (offset=1; offset<15; offset++)
+              if (*(warning_message+offset) == ' ')
+                  break;
+       }
+     }
+     if (png_ptr != NULL && png_ptr->warning_fn != NULL)
+        (*(png_ptr->warning_fn))(png_ptr, warning_message+offset);
+   }
+   else
+      png_default_warning(png_ptr, warning_message+offset);
+}
+
+/* These utilities are used internally to build an error message that relates
+ * to the current chunk.  The chunk name comes from png_ptr->chunk_name,
+ * this is used to prefix the message.  The message is limited in length
+ * to 63 bytes, the name characters are output as hex digits wrapped in []
+ * if the character is invalid.
+ */
+#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
+const static PNG_CONST char png_digit[16] = {
+   '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+   'A', 'B', 'C', 'D', 'E', 'F'
+};
+
+static void /* PRIVATE */
+png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
+   error_message)
+{
+   int iout = 0, iin = 0;
+
+   while (iin < 4)
+   {
+      int c = png_ptr->chunk_name[iin++];
+      if (isnonalpha(c))
+      {
+         buffer[iout++] = '[';
+         buffer[iout++] = png_digit[(c & 0xf0) >> 4];
+         buffer[iout++] = png_digit[c & 0x0f];
+         buffer[iout++] = ']';
+      }
+      else
+      {
+         buffer[iout++] = (png_byte)c;
+      }
+   }
+
+   if (error_message == NULL)
+      buffer[iout] = 0;
+   else
+   {
+      buffer[iout++] = ':';
+      buffer[iout++] = ' ';
+      png_strncpy(buffer+iout, error_message, 63);
+      buffer[iout+63] = 0;
+   }
+}
+
+void PNGAPI
+png_chunk_error(png_structp png_ptr, png_const_charp error_message)
+{
+   char msg[18+64];
+   if (png_ptr == NULL)
+     png_error(png_ptr, error_message);
+   else
+   {
+     png_format_buffer(png_ptr, msg, error_message);
+     png_error(png_ptr, msg);
+   }
+}
+
+void PNGAPI
+png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
+{
+   char msg[18+64];
+   if (png_ptr == NULL)
+     png_warning(png_ptr, warning_message);
+   else
+   {
+     png_format_buffer(png_ptr, msg, warning_message);
+     png_warning(png_ptr, msg);
+   }
+}
+
+/* This is the default error handling function.  Note that replacements for
+ * this function MUST NOT RETURN, or the program will likely crash.  This
+ * function is used by default, or if the program supplies NULL for the
+ * error function pointer in png_set_error_fn().
+ */
+static void /* PRIVATE */
+png_default_error(png_structp png_ptr, png_const_charp error_message)
+{
+#ifndef PNG_NO_CONSOLE_IO
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (*error_message == '#')
+   {
+     int offset;
+     char error_number[16];
+     for (offset=0; offset<15; offset++)
+     {
+         error_number[offset] = *(error_message+offset+1);
+         if (*(error_message+offset) == ' ')
+             break;
+     }
+     if((offset > 1) && (offset < 15))
+     {
+       error_number[offset-1]='\0';
+       fprintf(stderr, "libpng error no. %s: %s\n", error_number,
+          error_message+offset);
+     }
+     else
+       fprintf(stderr, "libpng error: %s, offset=%d\n", error_message,offset);
+   }
+   else
+#endif
+   fprintf(stderr, "libpng error: %s\n", error_message);
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+   if (png_ptr)
+   {
+#  ifdef USE_FAR_KEYWORD
+   {
+      jmp_buf jmpbuf;
+      png_memcpy(jmpbuf,png_ptr->jmpbuf,png_sizeof(jmp_buf));
+      longjmp(jmpbuf, 1);
+   }
+#  else
+   longjmp(png_ptr->jmpbuf, 1);
+#  endif
+   }
+#else
+   PNG_ABORT();
+#endif
+#ifdef PNG_NO_CONSOLE_IO
+   /* make compiler happy */ ;
+   if (&error_message != NULL)
+      return;
+#endif
+}
+
+/* This function is called when there is a warning, but the library thinks
+ * it can continue anyway.  Replacement functions don't have to do anything
+ * here if you don't want them to.  In the default configuration, png_ptr is
+ * not used, but it is passed in case it may be useful.
+ */
+static void /* PRIVATE */
+png_default_warning(png_structp png_ptr, png_const_charp warning_message)
+{
+#ifndef PNG_NO_CONSOLE_IO
+#  ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (*warning_message == '#')
+   {
+     int offset;
+     char warning_number[16];
+     for (offset=0; offset<15; offset++)
+     {
+        warning_number[offset]=*(warning_message+offset+1);
+        if (*(warning_message+offset) == ' ')
+            break;
+     }
+     if((offset > 1) && (offset < 15))
+     {
+       warning_number[offset-1]='\0';
+       fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
+          warning_message+offset);
+     }
+     else
+       fprintf(stderr, "libpng warning: %s\n", warning_message);
+   }
+   else
+#  endif
+     fprintf(stderr, "libpng warning: %s\n", warning_message);
+#else
+   /* make compiler happy */ ;
+   if (warning_message)
+     return;
+#endif
+   /* make compiler happy */ ;
+   if (png_ptr)
+      return;
+}
+
+/* This function is called when the application wants to use another method
+ * of handling errors and warnings.  Note that the error function MUST NOT
+ * return to the calling routine or serious problems will occur.  The return
+ * method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
+ */
+void PNGAPI
+png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
+   png_error_ptr error_fn, png_error_ptr warning_fn)
+{
+   if (png_ptr == NULL)
+      return;
+   png_ptr->error_ptr = error_ptr;
+   png_ptr->error_fn = error_fn;
+   png_ptr->warning_fn = warning_fn;
+}
+
+
+/* This function returns a pointer to the error_ptr associated with the user
+ * functions.  The application should free any memory associated with this
+ * pointer before png_write_destroy and png_read_destroy are called.
+ */
+png_voidp PNGAPI
+png_get_error_ptr(png_structp png_ptr)
+{
+   if (png_ptr == NULL)
+      return NULL;
+   return ((png_voidp)png_ptr->error_ptr);
+}
+
+
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+void PNGAPI
+png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
+{
+   if(png_ptr != NULL)
+   {
+     png_ptr->flags &=
+       ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
+   }
+}
+#endif
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */

rtgui/include/rtgui/rtgui_config.h

@@ -25,6 +25,7 @@
 /* #define RTGUI_USING_FONT16 */
 
 #define RT_USING_STDIO_FILERW
+#define RTGUI_IMAGE_PNG
 
 #define RTGUI_SVR_THREAD_PRIORITY		15
 #define RTGUI_SVR_THREAD_TIMESLICE		5