644 lines
14 KiB
C
644 lines
14 KiB
C
#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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#include <rtgui/blit.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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#define hw_driver (rtgui_graphic_driver_get_default())
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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_uint32_t Rmask;
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rt_uint32_t Gmask;
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rt_uint32_t Bmask;
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rt_size_t pixel_offset;
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rt_uint8_t byte_per_pixel;
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rt_uint8_t pad;
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rt_uint8_t ExpandBMP;
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rt_uint8_t *pixels;
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rt_uint8_t *line_pixels;
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rt_uint32_t pitch;
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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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rt_inline rt_uint32_t rtgui_filerw_read32(struct rtgui_filerw* src)
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{
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rt_uint32_t value;
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rtgui_filerw_read(src, &value, (sizeof value), 1);
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return value;
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}
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rt_inline rt_uint16_t rtgui_filerw_read16(struct rtgui_filerw* src)
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{
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rt_uint16_t value;
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rtgui_filerw_read(src, &value, (sizeof value), 1);
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return value;
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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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rt_off_t start;
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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 struct rtgui_image_palette* rtgui_image_bmp_load_palette(struct rtgui_image_bmp_header* header, struct rtgui_filerw* src)
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{
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/* Load the palette, if any */
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rt_size_t i;
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struct rtgui_image_palette* palette;
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if (header->biClrUsed == 0)
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header->biClrUsed = 1 << header->biBitCount;
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palette = rtgui_image_palette_create(header->biClrUsed);
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if (palette == RT_NULL) return RT_NULL;
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if ( header->biSize == 12 )
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{
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rt_uint8_t r, g, b;
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for ( i = 0; i < (int)header->biClrUsed; ++i )
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{
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rtgui_filerw_read(src, &b, 1, 1);
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rtgui_filerw_read(src, &g, 1, 1);
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rtgui_filerw_read(src, &r, 1, 1);
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palette->colors[i] = RTGUI_RGB(r, g, b);
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}
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}
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else
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{
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rt_uint8_t r, g, b, a;
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for ( i = 0; i < (int)header->biClrUsed; ++i )
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{
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rtgui_filerw_read(src, &b, 1, 1);
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rtgui_filerw_read(src, &g, 1, 1);
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rtgui_filerw_read(src, &r, 1, 1);
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rtgui_filerw_read(src, &a, 1, 1);
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palette->colors[i] = RTGUI_ARGB(a, r, g, b);
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}
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}
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return palette;
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}
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static rt_bool_t rtgui_image_bmp_load(struct rtgui_image* image, struct rtgui_filerw* src, rt_bool_t load)
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{
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rt_uint32_t Rmask;
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rt_uint32_t Gmask;
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rt_uint32_t Bmask;
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int ExpandBMP, bmpPitch;
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struct rtgui_image_bmp* bmp;
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struct rtgui_image_bmp_header* header;
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struct rtgui_image_palette* palette;
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bmp = RT_NULL;
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header = RT_NULL;
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palette = RT_NULL;
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header = (struct rtgui_image_bmp_header*) rtgui_malloc(sizeof(struct rtgui_image_bmp_header));
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if (header == RT_NULL) return RT_FALSE;
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if ( rtgui_filerw_read(src, header->magic, 1, sizeof(header->magic)) ==
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sizeof(sizeof(header->magic)) )
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{
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if (header->magic[0] != 'B' ||
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header->magic[1] != 'M')
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{
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goto __exit;
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}
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}
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header->bfSize = rtgui_filerw_read32(src);
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header->bfReserved1 = rtgui_filerw_read16(src);
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header->bfReserved2 = rtgui_filerw_read16(src);
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header->bfOffBits = rtgui_filerw_read32(src);
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/* Read the Win32 BITMAPINFOHEADER */
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header->biSize = rtgui_filerw_read32(src);
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if ( header->biSize == 12 )
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{
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header->biWidth = (rt_uint32_t)rtgui_filerw_read16(src);
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header->biHeight = (rt_uint32_t)rtgui_filerw_read16(src);
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header->biPlanes = rtgui_filerw_read16(src);
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header->biBitCount = rtgui_filerw_read16(src);
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header->biCompression = BI_RGB;
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header->biSizeImage = 0;
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header->biXPelsPerMeter = 0;
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header->biYPelsPerMeter = 0;
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header->biClrUsed = 0;
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header->biClrImportant = 0;
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}
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else
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{
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header->biWidth = rtgui_filerw_read32(src);
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header->biHeight = rtgui_filerw_read32(src);
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header->biPlanes = rtgui_filerw_read16(src);
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header->biBitCount = rtgui_filerw_read16(src);
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header->biCompression = rtgui_filerw_read32(src);
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header->biSizeImage = rtgui_filerw_read32(src);
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header->biXPelsPerMeter = rtgui_filerw_read32(src);
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header->biYPelsPerMeter = rtgui_filerw_read32(src);
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header->biClrUsed = rtgui_filerw_read32(src);
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header->biClrImportant = rtgui_filerw_read32(src);
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}
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/* allocate palette and expand 1 and 4 bit bitmaps to 8 bits per pixel */
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switch (header->biBitCount)
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{
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case 1:
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ExpandBMP = header->biBitCount;
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palette = rtgui_image_bmp_load_palette(header, src);
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header->biBitCount = 8;
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break;
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case 4:
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ExpandBMP = header->biBitCount;
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palette = rtgui_image_bmp_load_palette(header, src);
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header->biBitCount = 8;
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break;
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case 8:
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palette = rtgui_image_bmp_load_palette(header, src);
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ExpandBMP = 0;
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break;
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default:
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ExpandBMP = 0;
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break;
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}
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/* We don't support any BMP compression right now */
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Rmask = Gmask = Bmask = 0;
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switch (header->biCompression)
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{
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case BI_RGB:
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/* If there are no masks, use the defaults */
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if ( header->bfOffBits == (14 + header->biSize) )
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{
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/* Default values for the BMP format */
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switch (header->biBitCount)
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{
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case 15:
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case 16:
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Rmask = 0x7C00;
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Gmask = 0x03E0;
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Bmask = 0x001F;
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break;
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case 24:
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case 32:
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Rmask = 0x00FF0000;
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Gmask = 0x0000FF00;
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Bmask = 0x000000FF;
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break;
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default:
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break;
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}
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break;
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}
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/* Fall through -- read the RGB masks */
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case BI_BITFIELDS:
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switch (header->biBitCount)
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{
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case 15:
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case 16:
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case 32:
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Rmask = rtgui_filerw_read32(src);
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Gmask = rtgui_filerw_read32(src);
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Bmask = rtgui_filerw_read32(src);
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break;
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default:
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break;
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}
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break;
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default:
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rt_kprintf("Compressed BMP files not supported\n");
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goto __exit;
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}
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bmp = (struct rtgui_image_bmp*) rtgui_malloc(sizeof(struct rtgui_image_bmp));
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if (bmp == RT_NULL)
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goto __exit;
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/* set image information */
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image->w = header->biWidth;
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image->h = header->biHeight;
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image->engine = &rtgui_image_bmp_engine;
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image->data = bmp;
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bmp->filerw = src;
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bmp->byte_per_pixel = header->biBitCount/8;
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bmp->pitch = image->w * bmp->byte_per_pixel;
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bmp->pixel_offset = header->bfOffBits;
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bmp->Rmask = Rmask; bmp->Gmask = Gmask; bmp->Bmask = Bmask;
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bmp->ExpandBMP = ExpandBMP;
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if (palette != RT_NULL) image->palette = palette;
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/* get padding */
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switch (ExpandBMP)
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{
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case 1:
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bmpPitch = (header->biWidth + 7) >> 3;
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bmp->pad = (((bmpPitch)%4) ? (4-((bmpPitch)%4)) : 0);
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break;
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case 4:
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bmpPitch = (header->biWidth + 1) >> 1;
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bmp->pad = (((bmpPitch)%4) ? (4-((bmpPitch)%4)) : 0);
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break;
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default:
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bmp->pad = ((bmp->pitch%4) ? (4-(bmp->pitch%4)) : 0);
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break;
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}
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if (load == RT_TRUE)
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{
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rt_uint8_t *bits;
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rt_uint32_t i;
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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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goto __exit;
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/* Read the pixels. Note that the bmp image is upside down */
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if ( rtgui_filerw_seek(src, bmp->pixel_offset, RTGUI_FILE_SEEK_SET) < 0)
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goto __exit;
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bits = bmp->pixels + image->h * bmp->pitch;
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while ( bits > bmp->pixels )
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{
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bits -= bmp->pitch;
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switch (ExpandBMP)
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{
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case 1:
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case 4:
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{
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rt_uint8_t pixel = 0;
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int shift = (8 - ExpandBMP);
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for ( i=0; i < image->w; ++i )
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{
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if ( i % (8/ExpandBMP) == 0 )
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{
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if ( !rtgui_filerw_read(src, &pixel, 1, 1) )
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goto __exit;
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}
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*(bits+i) = (pixel>>shift);
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pixel <<= ExpandBMP;
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}
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}
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break;
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default:
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if ( rtgui_filerw_read(src, bits, 1, bmp->pitch) != bmp->pitch ) goto __exit;
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break;
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}
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/* Skip padding bytes */
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if ( bmp->pad )
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{
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rt_uint8_t padbyte;
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for ( i=0; i < bmp->pad; ++i )
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{
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rtgui_filerw_read(src, &padbyte, 1, 1);
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}
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}
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}
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rtgui_filerw_close(bmp->filerw);
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bmp->line_pixels = RT_NULL;
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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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bmp->line_pixels = rtgui_malloc(bmp->pitch);
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}
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return RT_TRUE;
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__exit:
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rtgui_free(header);
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if (palette != RT_NULL)
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{
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rtgui_free(palette);
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image->palette = RT_NULL;
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}
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if (bmp != RT_NULL)
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rtgui_free(bmp->pixels);
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rtgui_free(bmp);
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return RT_FALSE;
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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->line_pixels != RT_NULL) rtgui_free(bmp->line_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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int y;
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rt_uint16_t 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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/* 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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if (bmp->byte_per_pixel == hw_driver->byte_per_pixel)
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{
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for (y = 0; y < h; y ++)
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{
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dc->engine->blit_line(dc,
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dst_rect->x1, dst_rect->x1 + w,
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dst_rect->y1 + y,
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ptr);
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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_size_t pitch;
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rt_uint8_t *line_ptr;
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if (image->palette == RT_NULL)
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{
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rtgui_blit_line_func blit_line;
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line_ptr = (rt_uint8_t*) rtgui_malloc(hw_driver->byte_per_pixel * w);
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blit_line = rtgui_blit_line_get(hw_driver->byte_per_pixel , bmp->byte_per_pixel);
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pitch = w * bmp->byte_per_pixel;
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if (line_ptr != RT_NULL)
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{
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for (y = 0; y < h; y ++)
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{
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blit_line(line_ptr, ptr, pitch);
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dc->engine->blit_line(dc,
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dst_rect->x1, dst_rect->x1 + w,
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dst_rect->y1 + y,
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line_ptr);
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ptr += bmp->pitch;
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}
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}
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rtgui_free(line_ptr);
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}
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else
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{
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int x;
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rtgui_color_t color;
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/* use palette */
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for (y = 0; y < h; y ++)
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{
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ptr = bmp->pixels + (y * bmp->pitch);
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for (x = 0; x < w; x ++)
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{
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color = image->palette->colors[*ptr]; ptr ++;
|
|
rtgui_dc_draw_color_point(dc, dst_rect->x1 + x, dst_rect->y1 + y, color);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
int offset;
|
|
rt_uint8_t *bits;
|
|
|
|
/* calculate offset */
|
|
switch (bmp->ExpandBMP)
|
|
{
|
|
case 1:
|
|
offset = (image->h - h) * (image->w/8) * bmp->byte_per_pixel;
|
|
break;
|
|
|
|
case 4:
|
|
offset = (image->h - h) * (image->w/2) * bmp->byte_per_pixel;
|
|
break;
|
|
|
|
default:
|
|
offset = (image->h - h) * image->w * bmp->byte_per_pixel;
|
|
break;
|
|
}
|
|
/* seek to the begin of pixel data */
|
|
rtgui_filerw_seek(bmp->filerw, bmp->pixel_offset + offset, RTGUI_FILE_SEEK_SET);
|
|
|
|
if (bmp->ExpandBMP == 1 || bmp->ExpandBMP == 4)
|
|
{
|
|
int x;
|
|
rtgui_color_t color;
|
|
/* 1, 4 bit per pixels */
|
|
|
|
/* draw each line */
|
|
for (y = h - 1; y >= 0; y --)
|
|
{
|
|
/* read pixel data */
|
|
rt_uint8_t pixel = 0;
|
|
int shift = (8 - bmp->ExpandBMP);
|
|
int i;
|
|
|
|
bits = bmp->line_pixels;
|
|
for ( i=0; i < image->w; ++i )
|
|
{
|
|
if ( i % (8/bmp->ExpandBMP) == 0 )
|
|
{
|
|
if ( !rtgui_filerw_read(bmp->filerw, &pixel, 1, 1) )
|
|
return;
|
|
}
|
|
*(bits+i) = (pixel>>shift);
|
|
pixel <<= bmp->ExpandBMP;
|
|
}
|
|
|
|
/* Skip padding bytes */
|
|
if (bmp->pad)
|
|
{
|
|
int i;
|
|
rt_uint8_t padbyte;
|
|
for ( i=0; i < bmp->pad; ++i )
|
|
rtgui_filerw_read(bmp->filerw, &padbyte, 1, 1);
|
|
}
|
|
|
|
/* use palette */
|
|
bits = bmp->line_pixels;
|
|
for (x = 0; x < w; x ++)
|
|
{
|
|
color = image->palette->colors[*bits]; bits ++;
|
|
rtgui_dc_draw_color_point(dc, dst_rect->x1 + x, dst_rect->y1 + y, color);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
rt_uint8_t *line_ptr = (rt_uint8_t*) rtgui_malloc(hw_driver->byte_per_pixel * w);
|
|
if (line_ptr == RT_NULL) return;
|
|
|
|
/* draw each line */
|
|
for (y = h - 1; y >= 0; y --)
|
|
{
|
|
/* read line pixels */
|
|
rtgui_filerw_read(bmp->filerw, bmp->line_pixels, 1, bmp->pitch);
|
|
|
|
/* Skip padding bytes */
|
|
if (bmp->pad)
|
|
{
|
|
int i;
|
|
rt_uint8_t padbyte;
|
|
for ( i=0; i < bmp->pad; ++i )
|
|
rtgui_filerw_read(bmp->filerw, &padbyte, 1, 1);
|
|
}
|
|
|
|
if (image->palette == RT_NULL)
|
|
{
|
|
int pitch;
|
|
rtgui_blit_line_func blit_line;
|
|
blit_line = rtgui_blit_line_get(hw_driver->byte_per_pixel , bmp->byte_per_pixel);
|
|
pitch = w * bmp->byte_per_pixel;
|
|
if (line_ptr != RT_NULL)
|
|
{
|
|
blit_line(line_ptr, bmp->line_pixels, pitch);
|
|
dc->engine->blit_line(dc,
|
|
dst_rect->x1, dst_rect->x1 + w,
|
|
dst_rect->y1 + y,
|
|
line_ptr);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
int x;
|
|
rtgui_color_t color;
|
|
|
|
/* use palette */
|
|
bits = bmp->line_pixels;
|
|
for (x = 0; x < w; x ++)
|
|
{
|
|
color = image->palette->colors[*bits]; bits ++;
|
|
rtgui_dc_draw_color_point(dc, dst_rect->x1 + x, dst_rect->y1 + y, color);
|
|
}
|
|
}
|
|
}
|
|
if (line_ptr != RT_NULL) rtgui_free(line_ptr);
|
|
}
|
|
}
|
|
}
|
|
|
|
void rtgui_image_bmp_init()
|
|
{
|
|
/* register bmp on image system */
|
|
rtgui_image_register_engine(&rtgui_image_bmp_engine);
|
|
}
|