add bitmap image support.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@837 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/rtgui/common/image_bmp.c

+#include <rtthread.h>
+#include <rtgui/dc_hw.h>
+#include <rtgui/image.h>
+#include <rtgui/rtgui_system.h>
+#include <rtgui/image_bmp.h>
+
+/* Compression encodings for BMP files */
+#ifndef BI_RGB
+#define BI_RGB			0
+#define BI_RLE8			1
+#define BI_RLE4			2
+#define BI_BITFIELDS	3
+#endif
+
+struct rtgui_image_bmp
+{
+	rt_bool_t is_loaded;
+
+	rt_size_t   pixel_offset;
+	rt_uint8_t *pixels;
+
+	struct rtgui_filerw* filerw;
+};
+
+struct rtgui_image_bmp_header
+{
+	/* The Win32 BMP file header (14 bytes) */
+	char   magic[2];
+	rt_uint32_t bfSize;
+	rt_uint16_t bfReserved1;
+	rt_uint16_t bfReserved2;
+	rt_uint32_t bfOffBits;
+
+	/* The Win32 BITMAPINFOHEADER struct (40 bytes) */
+	rt_uint32_t biSize;
+	rt_int32_t  biWidth;
+	rt_int32_t  biHeight;
+	rt_uint16_t biPlanes;
+	rt_uint16_t biBitCount;
+	rt_uint32_t biCompression;
+	rt_uint32_t biSizeImage;
+	rt_int32_t  biXPelsPerMeter;
+	rt_int32_t  biYPelsPerMeter;
+	rt_uint32_t biClrUsed;
+	rt_uint32_t biClrImportant;
+};
+
+static rt_bool_t rtgui_image_bmp_check(struct rtgui_filerw* file);
+static rt_bool_t rtgui_image_bmp_load(struct rtgui_image* image, struct rtgui_filerw* file, rt_bool_t load);
+static void rtgui_image_bmp_unload(struct rtgui_image* image);
+static void rtgui_image_bmp_blit(struct rtgui_image* image, struct rtgui_dc* dc, struct rtgui_rect* rect);
+
+struct rtgui_image_engine rtgui_image_bmp_engine =
+{
+	"bmp",
+	{ RT_NULL },
+	rtgui_image_bmp_check,
+	rtgui_image_bmp_load,
+	rtgui_image_bmp_unload,
+	rtgui_image_bmp_blit
+};
+
+static rt_bool_t rtgui_image_bmp_check(struct rtgui_filerw* file)
+{
+	char magic[2];
+	rt_bool_t is_bmp;
+
+	if ( !file ) return 0;
+
+	start = rtgui_filerw_tell(file);
+
+	/* move to the beginning of file */
+	rtgui_filerw_seek(file, 0, RTGUI_FILE_SEEK_SET);
+
+	is_bmp = RT_FALSE;
+	if ( rtgui_filerw_read(file, magic, 1, sizeof(magic)) == sizeof(magic) )
+	{
+		if (magic[0] == 'B' &&
+			magic[1] == 'M')
+		{
+			is_bmp = RT_TRUE;
+		}
+	}
+
+	rtgui_filerw_seek(file, start, RTGUI_FILE_SEEK_SET);
+
+	return(is_bmp);
+}
+
+static rt_bool_t rtgui_image_bmp_load(struct rtgui_image* image, struct rtgui_filerw* file, rt_bool_t load)
+{
+    struct rtgui_image_bmp* bmp;
+
+    bmp = (struct rtgui_image_bmp*) rtgui_malloc(sizeof(struct rtgui_image_bmp));
+    if (bmp == RT_NULL) return RT_FALSE;
+
+	bmp->hw_driver = rtgui_graphic_driver_get_default();
+	if (bmp->hw_driver == RT_NULL) { rtgui_free(bmp); return RT_FALSE; }
+
+    rtgui_filerw_read(file, (char*)&header, 1, sizeof(header));
+
+	/* set image information */
+	image->w = (rt_uint16_t)header[1]; image->h = (rt_uint16_t)header[2];
+	image->engine = &rtgui_image_bmp_engine;
+	image->data = bmp;
+	bmp->filerw = file;
+	bmp->byte_per_pixel = bmp->hw_driver->byte_per_pixel;
+	bmp->pitch = image->w * bmp->byte_per_pixel;
+	bmp->pixel_offset = rtgui_filerw_tell(file);
+
+	if (load == RT_TRUE)
+	{
+		/* load all pixels */
+		bmp->pixels = rtgui_malloc(image->h * bmp->pitch);
+		if (bmp->pixels == RT_NULL)
+		{
+            /* release data */
+            rtgui_free(bmp);
+            return RT_FALSE;
+		}
+
+		rtgui_filerw_read(bmp->filerw, bmp->pixels, 1, image->h * bmp->pitch);
+		rtgui_filerw_close(bmp->filerw);
+		bmp->filerw = RT_NULL;
+		bmp->pixel_offset = 0;
+	}
+	else
+	{
+		bmp->pixels = RT_NULL;
+	}
+
+	return RT_TRUE;
+}
+
+static void rtgui_image_bmp_unload(struct rtgui_image* image)
+{
+	struct rtgui_image_bmp* bmp;
+
+	if (image != RT_NULL)
+	{
+		bmp = (struct rtgui_image_bmp*) image->data;
+
+		if (bmp->pixels != RT_NULL) rtgui_free(bmp->pixels);
+		if (bmp->filerw != RT_NULL)
+		{
+			rtgui_filerw_close(bmp->filerw);
+			bmp->filerw = RT_NULL;
+		}
+
+		/* release data */
+		rtgui_free(bmp);
+	}
+}
+
+static void rtgui_image_bmp_blit(struct rtgui_image* image, struct rtgui_dc* dc, struct rtgui_rect* dst_rect)
+{
+	rt_uint16_t y, w, h;
+	struct rtgui_image_bmp* bmp;
+
+	RT_ASSERT(image != RT_NULL || dc != RT_NULL || dst_rect != RT_NULL);
+
+	/* this dc is not visible */
+	if (rtgui_dc_get_visible(dc) != RT_TRUE) return;
+
+	bmp = (struct rtgui_image_bmp*) image->data;
+	RT_ASSERT(bmp != RT_NULL);
+
+	if ((dc->type != RTGUI_DC_HW) || (dc->type != RTGUI_DC_CLIENT)) return;
+
+	/* the minimum rect */
+    if (image->w < rtgui_rect_width(*dst_rect)) w = image->w;
+    else w = rtgui_rect_width(*dst_rect);
+    if (image->h < rtgui_rect_height(*dst_rect)) h = image->h;
+    else h = rtgui_rect_height(*dst_rect);
+
+    if (bmp->pixels != RT_NULL)
+    {
+		rt_uint8_t* ptr;
+
+		/* get pixel pointer */
+		ptr = bmp->pixels;
+
+		for (y = 0; y < h; y ++)
+		{
+			rtgui_dc_client_draw_raw_hline(dc, ptr, dst_rect->x1, dst_rect->x1 + w, dst_rect->y1 + y);
+			ptr += bmp->pitch;
+		}
+    }
+    else
+    {
+		rt_uint8_t* ptr;
+		ptr = rtgui_malloc(bmp->pitch);
+		if (ptr == RT_NULL) return; /* no memory */
+
+		/* seek to the begin of pixel data */
+		rtgui_filerw_seek(bmp->filerw, bmp->pixel_offset, RTGUI_FILE_SEEK_SET);
+
+		for (y = 0; y < h; y ++)
+		{
+			/* read pixel data */
+			if (rtgui_filerw_read(bmp->filerw, ptr, 1, bmp->pitch) != bmp->pitch)
+				break; /* read data failed */
+
+			rtgui_dc_client_draw_raw_hline(dc, ptr, dst_rect->x1,  dst_rect->x1 + w, dst_rect->y1 + y);
+		}
+
+		rtgui_free(ptr);
+    }
+}
+
+void rtgui_image_bmp_init()
+{
+	/* register bmp on image system */
+	rtgui_image_register_engine(&rtgui_image_bmp_engine);
+}

components/rtgui/include/rtgui/image_bmp.h

+/*
+ * File      : image_bmp.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2009, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2010-08-10     Bernard      first version
+ */
+#ifndef __RTGUI_IMAGE_BMP_H__
+#define __RTGUI_IMAGE_BMP_H__
+
+void rtgui_image_bmp_init(void);
+
+#endif