cac4d95ec8
LGTM was complaining: > Multiplication result may overflow 'unsigned int' before it is converted to 'unsigned long'.
306 lines
10 KiB
C
306 lines
10 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <efi.h>
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#include <efilib.h>
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#include "graphics.h"
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#include "splash.h"
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#include "util.h"
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struct bmp_file {
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CHAR8 signature[2];
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UINT32 size;
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UINT16 reserved[2];
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UINT32 offset;
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} __attribute__((packed));
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/* we require at least BITMAPINFOHEADER, later versions are
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accepted, but their features ignored */
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struct bmp_dib {
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UINT32 size;
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UINT32 x;
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UINT32 y;
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UINT16 planes;
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UINT16 depth;
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UINT32 compression;
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UINT32 image_size;
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INT32 x_pixel_meter;
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INT32 y_pixel_meter;
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UINT32 colors_used;
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UINT32 colors_important;
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} __attribute__((packed));
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struct bmp_map {
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UINT8 blue;
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UINT8 green;
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UINT8 red;
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UINT8 reserved;
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} __attribute__((packed));
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EFI_STATUS bmp_parse_header(UINT8 *bmp, UINTN size, struct bmp_dib **ret_dib,
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struct bmp_map **ret_map, UINT8 **pixmap) {
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struct bmp_file *file;
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struct bmp_dib *dib;
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struct bmp_map *map;
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UINTN row_size;
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if (size < sizeof(struct bmp_file) + sizeof(struct bmp_dib))
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return EFI_INVALID_PARAMETER;
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/* check file header */
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file = (struct bmp_file *)bmp;
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if (file->signature[0] != 'B' || file->signature[1] != 'M')
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return EFI_INVALID_PARAMETER;
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if (file->size != size)
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return EFI_INVALID_PARAMETER;
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if (file->size < file->offset)
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return EFI_INVALID_PARAMETER;
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/* check device-independent bitmap */
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dib = (struct bmp_dib *)(bmp + sizeof(struct bmp_file));
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if (dib->size < sizeof(struct bmp_dib))
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return EFI_UNSUPPORTED;
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switch (dib->depth) {
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case 1:
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case 4:
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case 8:
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case 24:
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if (dib->compression != 0)
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return EFI_UNSUPPORTED;
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break;
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case 16:
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case 32:
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if (dib->compression != 0 && dib->compression != 3)
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return EFI_UNSUPPORTED;
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break;
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default:
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return EFI_UNSUPPORTED;
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}
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row_size = ((UINTN) dib->depth * dib->x + 31) / 32 * 4;
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if (file->size - file->offset < dib->y * row_size)
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return EFI_INVALID_PARAMETER;
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if (row_size * dib->y > 64 * 1024 * 1024)
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return EFI_INVALID_PARAMETER;
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/* check color table */
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map = (struct bmp_map *)(bmp + sizeof(struct bmp_file) + dib->size);
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if (file->offset < sizeof(struct bmp_file) + dib->size)
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return EFI_INVALID_PARAMETER;
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if (file->offset > sizeof(struct bmp_file) + dib->size) {
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UINT32 map_count;
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UINTN map_size;
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if (dib->colors_used)
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map_count = dib->colors_used;
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else {
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switch (dib->depth) {
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case 1:
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case 4:
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case 8:
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map_count = 1 << dib->depth;
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break;
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default:
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map_count = 0;
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break;
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}
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}
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map_size = file->offset - (sizeof(struct bmp_file) + dib->size);
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if (map_size != sizeof(struct bmp_map) * map_count)
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return EFI_INVALID_PARAMETER;
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}
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*ret_map = map;
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*ret_dib = dib;
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*pixmap = bmp + file->offset;
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return EFI_SUCCESS;
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}
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static VOID pixel_blend(UINT32 *dst, const UINT32 source) {
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UINT32 alpha, src, src_rb, src_g, dst_rb, dst_g, rb, g;
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alpha = (source & 0xff);
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/* convert src from RGBA to XRGB */
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src = source >> 8;
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/* decompose into RB and G components */
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src_rb = (src & 0xff00ff);
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src_g = (src & 0x00ff00);
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dst_rb = (*dst & 0xff00ff);
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dst_g = (*dst & 0x00ff00);
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/* blend */
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rb = ((((src_rb - dst_rb) * alpha + 0x800080) >> 8) + dst_rb) & 0xff00ff;
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g = ((((src_g - dst_g) * alpha + 0x008000) >> 8) + dst_g) & 0x00ff00;
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*dst = (rb | g);
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}
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EFI_STATUS bmp_to_blt(EFI_GRAPHICS_OUTPUT_BLT_PIXEL *buf,
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struct bmp_dib *dib, struct bmp_map *map,
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UINT8 *pixmap) {
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UINT8 *in;
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UINTN y;
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/* transform and copy pixels */
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in = pixmap;
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for (y = 0; y < dib->y; y++) {
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EFI_GRAPHICS_OUTPUT_BLT_PIXEL *out;
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UINTN row_size;
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UINTN x;
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out = &buf[(dib->y - y - 1) * dib->x];
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for (x = 0; x < dib->x; x++, in++, out++) {
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switch (dib->depth) {
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case 1: {
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UINTN i;
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for (i = 0; i < 8 && x < dib->x; i++) {
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out->Red = map[((*in) >> (7 - i)) & 1].red;
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out->Green = map[((*in) >> (7 - i)) & 1].green;
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out->Blue = map[((*in) >> (7 - i)) & 1].blue;
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out++;
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x++;
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}
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out--;
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x--;
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break;
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}
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case 4: {
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UINTN i;
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i = (*in) >> 4;
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out->Red = map[i].red;
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out->Green = map[i].green;
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out->Blue = map[i].blue;
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if (x < (dib->x - 1)) {
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out++;
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x++;
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i = (*in) & 0x0f;
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out->Red = map[i].red;
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out->Green = map[i].green;
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out->Blue = map[i].blue;
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}
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break;
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}
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case 8:
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out->Red = map[*in].red;
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out->Green = map[*in].green;
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out->Blue = map[*in].blue;
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break;
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case 16: {
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UINT16 i = *(UINT16 *) in;
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out->Red = (i & 0x7c00) >> 7;
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out->Green = (i & 0x3e0) >> 2;
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out->Blue = (i & 0x1f) << 3;
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in += 1;
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break;
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}
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case 24:
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out->Red = in[2];
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out->Green = in[1];
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out->Blue = in[0];
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in += 2;
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break;
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case 32: {
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UINT32 i = *(UINT32 *) in;
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pixel_blend((UINT32 *)out, i);
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in += 3;
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break;
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}
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}
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}
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/* add row padding; new lines always start at 32 bit boundary */
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row_size = in - pixmap;
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in += ((row_size + 3) & ~3) - row_size;
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}
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return EFI_SUCCESS;
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}
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EFI_STATUS graphics_splash(UINT8 *content, UINTN len, const EFI_GRAPHICS_OUTPUT_BLT_PIXEL *background) {
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EFI_GRAPHICS_OUTPUT_BLT_PIXEL pixel = {};
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EFI_GUID GraphicsOutputProtocolGuid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
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EFI_GRAPHICS_OUTPUT_PROTOCOL *GraphicsOutput = NULL;
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struct bmp_dib *dib;
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struct bmp_map *map;
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UINT8 *pixmap;
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UINT64 blt_size;
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_cleanup_freepool_ VOID *blt = NULL;
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UINTN x_pos = 0;
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UINTN y_pos = 0;
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EFI_STATUS err;
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if (!background) {
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if (StriCmp(L"Apple", ST->FirmwareVendor) == 0) {
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pixel.Red = 0xc0;
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pixel.Green = 0xc0;
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pixel.Blue = 0xc0;
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}
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background = &pixel;
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}
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err = LibLocateProtocol(&GraphicsOutputProtocolGuid, (VOID **)&GraphicsOutput);
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if (EFI_ERROR(err))
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return err;
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err = bmp_parse_header(content, len, &dib, &map, &pixmap);
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if (EFI_ERROR(err))
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return err;
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if (dib->x < GraphicsOutput->Mode->Info->HorizontalResolution)
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x_pos = (GraphicsOutput->Mode->Info->HorizontalResolution - dib->x) / 2;
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if (dib->y < GraphicsOutput->Mode->Info->VerticalResolution)
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y_pos = (GraphicsOutput->Mode->Info->VerticalResolution - dib->y) / 2;
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uefi_call_wrapper(GraphicsOutput->Blt, 10, GraphicsOutput,
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(EFI_GRAPHICS_OUTPUT_BLT_PIXEL *)background,
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EfiBltVideoFill, 0, 0, 0, 0,
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GraphicsOutput->Mode->Info->HorizontalResolution,
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GraphicsOutput->Mode->Info->VerticalResolution, 0);
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/* EFI buffer */
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blt_size = sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL) * dib->x * dib->y;
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blt = AllocatePool(blt_size);
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if (!blt)
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return EFI_OUT_OF_RESOURCES;
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err = uefi_call_wrapper(GraphicsOutput->Blt, 10, GraphicsOutput,
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blt, EfiBltVideoToBltBuffer, x_pos, y_pos, 0, 0,
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dib->x, dib->y, 0);
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if (EFI_ERROR(err))
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return err;
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err = bmp_to_blt(blt, dib, map, pixmap);
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if (EFI_ERROR(err))
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return err;
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err = graphics_mode(TRUE);
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if (EFI_ERROR(err))
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return err;
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return uefi_call_wrapper(GraphicsOutput->Blt, 10, GraphicsOutput,
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blt, EfiBltBufferToVideo, 0, 0, x_pos, y_pos,
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dib->x, dib->y, 0);
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}
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