64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
#include <stdint.h>
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#include <fs/file.h>
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#include <lib/image.h>
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#include <lib/bmp.h>
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#include <lib/libc.h>
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#include <lib/misc.h>
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#include <mm/pmm.h>
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struct bmp_header {
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uint16_t bf_signature;
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uint32_t bf_size;
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uint32_t reserved;
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uint32_t bf_offset;
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uint32_t bi_size;
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uint32_t bi_width;
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uint32_t bi_height;
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uint16_t bi_planes;
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uint16_t bi_bpp;
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uint32_t bi_compression;
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uint32_t bi_image_size;
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uint32_t bi_xcount;
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uint32_t bi_ycount;
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uint32_t bi_clr_used;
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uint32_t bi_clr_important;
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uint32_t red_mask;
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uint32_t green_mask;
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uint32_t blue_mask;
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} __attribute__((packed));
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bool bmp_open_image(struct image *image, struct file_handle *file) {
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struct bmp_header header;
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fread(file, &header, 0, sizeof(struct bmp_header));
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if (memcmp(&header.bf_signature, "BM", 2) != 0)
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return false;
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// We don't support bpp lower than 8
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if (header.bi_bpp % 8 != 0)
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return false;
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image->img = ext_mem_alloc(header.bf_size);
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uint32_t bf_size;
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if (header.bf_offset + header.bf_size > file->size) {
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bf_size = file->size - header.bf_offset;
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} else {
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bf_size = header.bf_size;
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}
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fread(file, image->img, header.bf_offset, bf_size);
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image->allocated_size = header.bf_size;
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image->x_size = header.bi_width;
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image->y_size = header.bi_height;
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image->pitch = ALIGN_UP(header.bi_width * header.bi_bpp, 32) / 8;
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image->bpp = header.bi_bpp;
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image->img_width = header.bi_width;
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image->img_height = header.bi_height;
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return true;
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}
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