135 lines
2.9 KiB
C
135 lines
2.9 KiB
C
#include <common.h>
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#include <errno.h>
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#include <malloc.h>
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#include <fb.h>
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#include "bmp_layout.h"
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#include <asm/byteorder.h>
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#include <gui/graphic_utils.h>
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#include <init.h>
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#include <gui/image_renderer.h>
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struct image *bmp_open(char *inbuf, int insize)
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{
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struct image *img = calloc(1, sizeof(struct image));
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struct bmp_image *bmp = (struct bmp_image*)inbuf;
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if (!img) {
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free(bmp);
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return ERR_PTR(-ENOMEM);
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}
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img->data = inbuf;
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img->height = le32_to_cpu(bmp->header.height);;
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img->width = le32_to_cpu(bmp->header.width);;
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img->bits_per_pixel = le16_to_cpu(bmp->header.bit_count);
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pr_debug("bmp: %d x %d x %d data@0x%p\n", img->width, img->height,
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img->bit_per_pixel, img->data);
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return img;
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}
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void bmp_close(struct image *img)
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{
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free(img->data);
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}
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static int bmp_renderer(struct fb_info *info, struct image *img, void* fb,
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int startx, int starty, void* offscreenbuf)
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{
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struct bmp_image *bmp = img->data;
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int width, height;
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int bits_per_pixel, fbsize;
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void *adr, *buf;
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char *image;
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int xres, yres;
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xres = info->xres;
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yres = info->yres;
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if (startx < 0) {
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startx = (xres - img->width) / 2;
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if (startx < 0)
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startx = 0;
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}
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if (starty < 0) {
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starty = (yres - img->height) / 2;
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if (starty < 0)
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starty = 0;
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}
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width = min(img->width, xres - startx);
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height = min(img->height, yres - starty);
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bits_per_pixel = img->bits_per_pixel;
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fbsize = xres * yres * (info->bits_per_pixel >> 3);
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buf = offscreenbuf ? offscreenbuf : fb;
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if (bits_per_pixel == 8) {
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int x, y;
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struct bmp_color_table_entry *color_table = bmp->color_table;
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for (y = 0; y < height; y++) {
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image = (char *)bmp +
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le32_to_cpu(bmp->header.data_offset);
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image += (img->height - y - 1) * img->width * (bits_per_pixel >> 3);
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adr = buf + ((y + starty) * xres + startx) *
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(info->bits_per_pixel >> 3);
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for (x = 0; x < width; x++) {
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int pixel;
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pixel = *image;
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set_rgb_pixel(info, adr, color_table[pixel].red,
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color_table[pixel].green,
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color_table[pixel].blue);
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adr += info->bits_per_pixel >> 3;
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image += bits_per_pixel >> 3;
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}
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}
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} else if (bits_per_pixel == 24) {
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int x, y;
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for (y = 0; y < height; y++) {
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image = (char *)bmp +
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le32_to_cpu(bmp->header.data_offset);
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image += (img->height - y - 1) * img->width * (bits_per_pixel >> 3);
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adr = buf + ((y + starty) * xres + startx) *
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(info->bits_per_pixel >> 3);
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for (x = 0; x < width; x++) {
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char *pixel;
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pixel = image;
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set_rgb_pixel(info, adr, pixel[2], pixel[1],
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pixel[0]);
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adr += info->bits_per_pixel >> 3;
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image += bits_per_pixel >> 3;
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}
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}
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} else
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printf("bmp: illegal bits per pixel value: %d\n", bits_per_pixel);
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if (offscreenbuf)
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memcpy(fb, offscreenbuf, fbsize);
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return img->height;
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}
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static struct image_renderer bmp = {
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.type = filetype_bmp,
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.open = bmp_open,
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.close = bmp_close,
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.renderer = bmp_renderer,
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};
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static int bmp_init(void)
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{
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return image_renderer_register(&bmp);
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}
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fs_initcall(bmp_init);
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