add bitmap image support.
git-svn-id: https://rt-thread.googlecode.com/svn/trunk@837 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
bernard.xiong@gmail.com
parent
82239341b5
commit
50eb24dfe7
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#include <rtthread.h>
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#include <rtgui/dc_hw.h>
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#include <rtgui/image.h>
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#include <rtgui/rtgui_system.h>
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#include <rtgui/image_bmp.h>
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/* Compression encodings for BMP files */
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#ifndef BI_RGB
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#define BI_RGB 0
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#define BI_RLE8 1
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#define BI_RLE4 2
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#define BI_BITFIELDS 3
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#endif
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struct rtgui_image_bmp
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{
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rt_bool_t is_loaded;
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rt_size_t pixel_offset;
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rt_uint8_t *pixels;
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struct rtgui_filerw* filerw;
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};
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struct rtgui_image_bmp_header
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{
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/* The Win32 BMP file header (14 bytes) */
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char magic[2];
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rt_uint32_t bfSize;
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rt_uint16_t bfReserved1;
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rt_uint16_t bfReserved2;
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rt_uint32_t bfOffBits;
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/* The Win32 BITMAPINFOHEADER struct (40 bytes) */
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rt_uint32_t biSize;
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rt_int32_t biWidth;
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rt_int32_t biHeight;
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rt_uint16_t biPlanes;
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rt_uint16_t biBitCount;
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rt_uint32_t biCompression;
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rt_uint32_t biSizeImage;
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rt_int32_t biXPelsPerMeter;
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rt_int32_t biYPelsPerMeter;
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rt_uint32_t biClrUsed;
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rt_uint32_t biClrImportant;
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};
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static rt_bool_t rtgui_image_bmp_check(struct rtgui_filerw* file);
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static rt_bool_t rtgui_image_bmp_load(struct rtgui_image* image, struct rtgui_filerw* file, rt_bool_t load);
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static void rtgui_image_bmp_unload(struct rtgui_image* image);
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static void rtgui_image_bmp_blit(struct rtgui_image* image, struct rtgui_dc* dc, struct rtgui_rect* rect);
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struct rtgui_image_engine rtgui_image_bmp_engine =
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{
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"bmp",
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{ RT_NULL },
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rtgui_image_bmp_check,
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rtgui_image_bmp_load,
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rtgui_image_bmp_unload,
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rtgui_image_bmp_blit
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};
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static rt_bool_t rtgui_image_bmp_check(struct rtgui_filerw* file)
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{
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char magic[2];
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rt_bool_t is_bmp;
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if ( !file ) return 0;
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start = rtgui_filerw_tell(file);
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/* move to the beginning of file */
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rtgui_filerw_seek(file, 0, RTGUI_FILE_SEEK_SET);
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is_bmp = RT_FALSE;
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if ( rtgui_filerw_read(file, magic, 1, sizeof(magic)) == sizeof(magic) )
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{
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if (magic[0] == 'B' &&
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magic[1] == 'M')
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{
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is_bmp = RT_TRUE;
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}
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}
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rtgui_filerw_seek(file, start, RTGUI_FILE_SEEK_SET);
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return(is_bmp);
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}
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static rt_bool_t rtgui_image_bmp_load(struct rtgui_image* image, struct rtgui_filerw* file, rt_bool_t load)
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{
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struct rtgui_image_bmp* bmp;
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bmp = (struct rtgui_image_bmp*) rtgui_malloc(sizeof(struct rtgui_image_bmp));
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if (bmp == RT_NULL) return RT_FALSE;
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bmp->hw_driver = rtgui_graphic_driver_get_default();
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if (bmp->hw_driver == RT_NULL) { rtgui_free(bmp); return RT_FALSE; }
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rtgui_filerw_read(file, (char*)&header, 1, sizeof(header));
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/* set image information */
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image->w = (rt_uint16_t)header[1]; image->h = (rt_uint16_t)header[2];
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image->engine = &rtgui_image_bmp_engine;
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image->data = bmp;
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bmp->filerw = file;
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bmp->byte_per_pixel = bmp->hw_driver->byte_per_pixel;
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bmp->pitch = image->w * bmp->byte_per_pixel;
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bmp->pixel_offset = rtgui_filerw_tell(file);
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if (load == RT_TRUE)
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{
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/* load all pixels */
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bmp->pixels = rtgui_malloc(image->h * bmp->pitch);
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if (bmp->pixels == RT_NULL)
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{
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/* release data */
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rtgui_free(bmp);
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return RT_FALSE;
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}
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rtgui_filerw_read(bmp->filerw, bmp->pixels, 1, image->h * bmp->pitch);
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rtgui_filerw_close(bmp->filerw);
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bmp->filerw = RT_NULL;
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bmp->pixel_offset = 0;
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}
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else
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{
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bmp->pixels = RT_NULL;
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}
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return RT_TRUE;
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}
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static void rtgui_image_bmp_unload(struct rtgui_image* image)
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{
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struct rtgui_image_bmp* bmp;
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if (image != RT_NULL)
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{
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bmp = (struct rtgui_image_bmp*) image->data;
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if (bmp->pixels != RT_NULL) rtgui_free(bmp->pixels);
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if (bmp->filerw != RT_NULL)
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{
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rtgui_filerw_close(bmp->filerw);
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bmp->filerw = RT_NULL;
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}
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/* release data */
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rtgui_free(bmp);
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}
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}
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static void rtgui_image_bmp_blit(struct rtgui_image* image, struct rtgui_dc* dc, struct rtgui_rect* dst_rect)
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{
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rt_uint16_t y, w, h;
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struct rtgui_image_bmp* bmp;
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RT_ASSERT(image != RT_NULL || dc != RT_NULL || dst_rect != RT_NULL);
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/* this dc is not visible */
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if (rtgui_dc_get_visible(dc) != RT_TRUE) return;
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bmp = (struct rtgui_image_bmp*) image->data;
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RT_ASSERT(bmp != RT_NULL);
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if ((dc->type != RTGUI_DC_HW) || (dc->type != RTGUI_DC_CLIENT)) return;
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/* the minimum rect */
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if (image->w < rtgui_rect_width(*dst_rect)) w = image->w;
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else w = rtgui_rect_width(*dst_rect);
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if (image->h < rtgui_rect_height(*dst_rect)) h = image->h;
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else h = rtgui_rect_height(*dst_rect);
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if (bmp->pixels != RT_NULL)
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{
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rt_uint8_t* ptr;
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/* get pixel pointer */
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ptr = bmp->pixels;
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for (y = 0; y < h; y ++)
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{
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rtgui_dc_client_draw_raw_hline(dc, ptr, dst_rect->x1, dst_rect->x1 + w, dst_rect->y1 + y);
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ptr += bmp->pitch;
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}
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}
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else
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{
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rt_uint8_t* ptr;
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ptr = rtgui_malloc(bmp->pitch);
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if (ptr == RT_NULL) return; /* no memory */
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/* seek to the begin of pixel data */
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rtgui_filerw_seek(bmp->filerw, bmp->pixel_offset, RTGUI_FILE_SEEK_SET);
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for (y = 0; y < h; y ++)
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{
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/* read pixel data */
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if (rtgui_filerw_read(bmp->filerw, ptr, 1, bmp->pitch) != bmp->pitch)
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break; /* read data failed */
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rtgui_dc_client_draw_raw_hline(dc, ptr, dst_rect->x1, dst_rect->x1 + w, dst_rect->y1 + y);
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}
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rtgui_free(ptr);
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}
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}
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void rtgui_image_bmp_init()
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{
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/* register bmp on image system */
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rtgui_image_register_engine(&rtgui_image_bmp_engine);
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}
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@ -0,0 +1,19 @@
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/*
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* File : image_bmp.h
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2009, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2010-08-10 Bernard first version
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*/
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#ifndef __RTGUI_IMAGE_BMP_H__
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#define __RTGUI_IMAGE_BMP_H__
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void rtgui_image_bmp_init(void);
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#endif
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