mirror of
https://github.com/libretro/RetroArch
synced 2025-02-01 09:32:58 +00:00
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
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* Copyright (C) 2011-2015 - Daniel De Matteis
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <formats/tga.h>
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#include <formats/image.h>
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bool rtga_image_load_shift(uint8_t *buf,
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void *data,
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unsigned a_shift, unsigned r_shift,
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unsigned g_shift, unsigned b_shift)
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{
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unsigned i, bits, size, bits_mul;
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uint8_t info[6];
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unsigned width = 0;
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unsigned height = 0;
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const uint8_t *tmp = NULL;
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struct texture_image *out_img = (struct texture_image*)data;
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if (buf[2] != 2)
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{
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fprintf(stderr, "TGA image is not uncompressed RGB.\n");
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return false;
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}
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memcpy(info, buf + 12, 6);
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width = info[0] + ((unsigned)info[1] * 256);
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height = info[2] + ((unsigned)info[3] * 256);
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bits = info[4];
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fprintf(stderr, "Loaded TGA: (%ux%u @ %u bpp)\n", width, height, bits);
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size = width * height * sizeof(uint32_t);
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out_img->pixels = (uint32_t*)malloc(size);
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out_img->width = width;
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out_img->height = height;
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if (!out_img->pixels)
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{
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fprintf(stderr, "Failed to allocate TGA pixels.\n");
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return false;
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}
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tmp = buf + 18;
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bits_mul = 3;
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if (bits != 32 && bits != 24)
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{
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fprintf(stderr, "Bit depth of TGA image is wrong. Only 32-bit and 24-bit supported.\n");
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free(out_img->pixels);
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out_img->pixels = NULL;
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return false;
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}
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if (bits == 32)
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bits_mul = 4;
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for (i = 0; i < width * height; i++)
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{
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uint32_t b = tmp[i * bits_mul + 0];
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uint32_t g = tmp[i * bits_mul + 1];
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uint32_t r = tmp[i * bits_mul + 2];
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uint32_t a = tmp[i * bits_mul + 3];
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if (bits == 24)
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a = 0xff;
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out_img->pixels[i] = (a << a_shift) |
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(r << r_shift) | (g << g_shift) | (b << b_shift);
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}
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return true;
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}
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