mirror of
https://gitlab.com/bztsrc/posix-uefi.git
synced 2025-01-01 03:25:52 +01:00
80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
#include <uefi.h>
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/* public domain image loader - http://nothings.org/stb_image.h */
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#define STB_IMAGE_IMPLEMENTATION
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#include "stb_image.h"
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/**
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* Display PNG image
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*/
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int main(int argc, char **argv)
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{
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efi_status_t status;
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efi_guid_t gopGuid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
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efi_gop_t *gop = NULL;
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efi_gop_mode_info_t *info = NULL;
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uintn_t isiz = sizeof(efi_gop_mode_info_t), currentMode, i;
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FILE *f;
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unsigned char *buff;
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uint32_t *data;
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int w, h, l;
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long int size;
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stbi__context s;
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stbi__result_info ri;
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/* load image */
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if((f = fopen("\\0C_png\\image.png", "r"))) {
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fseek(f, 0, SEEK_END);
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size = ftell(f);
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fseek(f, 0, SEEK_SET);
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buff = (unsigned char*)malloc(size);
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if(!buff) {
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err: fprintf(stderr, "unable to allocate memory\n");
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return 1;
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}
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fread(buff, size, 1, f);
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fclose(f);
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ri.bits_per_channel = 8;
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s.read_from_callbacks = 0;
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s.img_buffer = s.img_buffer_original = buff;
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s.img_buffer_end = s.img_buffer_original_end = buff + size;
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data = (uint32_t*)stbi__png_load(&s, &w, &h, &l, 4, &ri);
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if(!data) {
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fprintf(stdout, "Unable to decode png: %s\n", stbi__g_failure_reason);
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return 0;
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}
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} else {
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fprintf(stderr, "Unable to load image\n");
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return 0;
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}
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/* set video mode */
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status = BS->LocateProtocol(&gopGuid, NULL, (void**)&gop);
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if(!EFI_ERROR(status) && gop) {
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status = gop->SetMode(gop, 0);
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ST->ConOut->Reset(ST->ConOut, 0);
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ST->StdErr->Reset(ST->StdErr, 0);
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if(EFI_ERROR(status)) {
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fprintf(stderr, "unable to set video mode\n");
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return 0;
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}
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} else {
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fprintf(stderr, "unable to get graphics output protocol\n");
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return 0;
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}
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/* png is RGBA, but UEFI needs BGRA */
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if(gop->Mode->Information->PixelFormat == PixelBlueGreenRedReserved8BitPerColor ||
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(gop->Mode->Information->PixelFormat == PixelBitMask && gop->Mode->Information->PixelInformation.BlueMask != 0xff0000)) {
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for(l = 0; l < w * h; l++)
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data[l] = ((data[l] & 0xff) << 16) | (data[l] & 0xff00) | ((data[l] >> 16) & 0xff);
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}
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/* display image */
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gop->Blt(gop, data, EfiBltBufferToVideo, 0, 0, (gop->Mode->Information->HorizontalResolution - w) / 2,
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(gop->Mode->Information->VerticalResolution - h) / 2, w, h, 0);
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/* free resources exit */
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free(data);
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free(buff);
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return 0;
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}
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