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RetroArch/libretro-common/formats/tga/rtga.c
libretroadmin daa9e352cc Remove asserts
2023-01-09 00:51:05 +01:00

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/* Copyright (C) 2010-2020 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (rtga.c).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/* Modified version of stb_image's TGA sources. */
#include <stdio.h>
#include <stdint.h>
#include <stdarg.h>
#include <stddef.h> /* ptrdiff_t on osx */
#include <stdlib.h>
#include <string.h>
#include <retro_inline.h>
#include <formats/image.h>
#include <formats/rtga.h>
#define RTGA_COMPUTE_Y(r, g, b) ((uint8_t)((((r) * 77) + ((g) * 150) + (29 * (b))) >> 8))
struct rtga
{
uint8_t *buff_data;
uint32_t *output_image;
};
typedef struct
{
uint8_t *img_buffer;
uint8_t *img_buffer_end;
uint8_t *img_buffer_original;
int buflen;
int img_n, img_out_n;
uint32_t img_x, img_y;
uint8_t buffer_start[128];
} rtga_context;
static INLINE uint8_t rtga_get8(rtga_context *s)
{
if (s->img_buffer < s->img_buffer_end)
return *s->img_buffer++;
return 0;
}
static void rtga_skip(rtga_context *s, int n)
{
if (n < 0)
{
s->img_buffer = s->img_buffer_end;
return;
}
s->img_buffer += n;
}
static int rtga_get16le(rtga_context *s)
{
return rtga_get8(s) + (rtga_get8(s) << 8);
}
static unsigned char *rtga_convert_format(
unsigned char *data,
int img_n,
int req_comp,
unsigned int x,
unsigned int y)
{
int i,j;
unsigned char *good = (unsigned char *) malloc(req_comp * x * y);
if (!good)
{
free(data);
return NULL;
}
for (j=0; j < (int) y; ++j)
{
unsigned char *src = data + j * x * img_n ;
unsigned char *dest = good + j * x * req_comp;
switch (((img_n)*8+(req_comp)))
{
case ((1)*8+(2)):
for (i=x-1; i >= 0; --i, src += 1, dest += 2)
{
dest[0]=src[0];
dest[1]=255;
}
break;
case ((1)*8+(3)):
for (i=x-1; i >= 0; --i, src += 1, dest += 3)
dest[0]=dest[1]=dest[2]=src[0];
break;
case ((1)*8+(4)):
for (i=x-1; i >= 0; --i, src += 1, dest += 4)
{
dest[0]=dest[1]=dest[2]=src[0];
dest[3]=255;
}
break;
case ((2)*8+(1)):
for (i=x-1; i >= 0; --i, src += 2, dest += 1)
dest[0]=src[0];
break;
case ((2)*8+(3)):
for (i=x-1; i >= 0; --i, src += 2, dest += 3)
dest[0]=dest[1]=dest[2]=src[0];
break;
case ((2)*8+(4)):
for (i=x-1; i >= 0; --i, src += 2, dest += 4)
{
dest[0]=dest[1]=dest[2]=src[0];
dest[3]=src[1];
}
break;
case ((3)*8+(4)):
for (i=x-1; i >= 0; --i, src += 3, dest += 4)
{
dest[0]=src[0];
dest[1]=src[1];
dest[2]=src[2];
dest[3]=255;
}
break;
case ((3)*8+(1)):
for (i=x-1; i >= 0; --i, src += 3, dest += 1)
dest[0] = RTGA_COMPUTE_Y(src[0],src[1],src[2]);
break;
case ((3)*8+(2)):
for (i=x-1; i >= 0; --i, src += 3, dest += 2)
{
dest[0] = RTGA_COMPUTE_Y(src[0],src[1],src[2]);
dest[1] = 255;
}
break;
case ((4)*8+(1)):
for (i=x-1; i >= 0; --i, src += 4, dest += 1)
dest[0] = RTGA_COMPUTE_Y(src[0],src[1],src[2]);
break;
case ((4)*8+(2)):
for (i=x-1; i >= 0; --i, src += 4, dest += 2)
{
dest[0] = RTGA_COMPUTE_Y(src[0],src[1],src[2]);
dest[1] = src[3];
}
break;
case ((4)*8+(3)):
for (i=x-1; i >= 0; --i, src += 4, dest += 3)
{
dest[0]=src[0];
dest[1]=src[1];
dest[2]=src[2];
}
break;
default:
break;
}
}
free(data);
return good;
}
static uint8_t *rtga_tga_load(rtga_context *s,
unsigned *x, unsigned *y, int *comp, int req_comp)
{
/* Read in the TGA header stuff */
int tga_offset = rtga_get8(s);
int tga_indexed = rtga_get8(s);
int tga_image_type = rtga_get8(s);
int tga_is_RLE = 0;
int tga_palette_start = rtga_get16le(s);
int tga_palette_len = rtga_get16le(s);
int tga_palette_bits = rtga_get8(s);
int tga_x_origin = rtga_get16le(s);
int tga_y_origin = rtga_get16le(s);
int tga_width = rtga_get16le(s);
int tga_height = rtga_get16le(s);
int tga_bits_per_pixel = rtga_get8(s);
int tga_comp = tga_bits_per_pixel / 8;
int tga_inverted = rtga_get8(s);
/* image data */
unsigned char *tga_data = NULL;
(void)tga_palette_start;
(void)tga_x_origin;
(void)tga_y_origin;
/* do a tiny bit of precessing */
if (tga_image_type >= 8)
{
tga_image_type -= 8;
tga_is_RLE = 1;
}
/* int tga_alpha_bits = tga_inverted & 15; */
tga_inverted = 1 - ((tga_inverted >> 5) & 1);
/* error check */
if (
(tga_width < 1) || (tga_height < 1) ||
(tga_image_type < 1) || (tga_image_type > 3) ||
(
(tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16) &&
(tga_bits_per_pixel != 24) && (tga_bits_per_pixel != 32)
)
)
return NULL; /* we don't report this as a bad TGA because we don't even know if it's TGA */
/* If paletted, then we will use the number of bits from the palette */
if (tga_indexed)
tga_comp = tga_palette_bits / 8;
/* TGA info */
*x = tga_width;
*y = tga_height;
if (comp)
*comp = tga_comp;
tga_data = (unsigned char*)malloc((size_t)tga_width * tga_height * tga_comp);
if (!tga_data)
return NULL;
/* skip to the data's starting position (offset usually = 0) */
rtga_skip(s, tga_offset );
if (!tga_indexed && !tga_is_RLE)
{
int i;
for (i=0; i < tga_height; ++i)
{
int _y = tga_inverted ? (tga_height -i - 1) : i;
uint8_t *tga_row = tga_data + _y * tga_width * tga_comp;
int n = tga_width * tga_comp;
if (s->img_buffer + n <= s->img_buffer_end)
{
memcpy(tga_row, s->img_buffer, n);
s->img_buffer += n;
}
}
}
else
{
int i, j;
int RLE_repeating = 0;
int RLE_count = 0;
int read_next_pixel = 1;
/* Needs to be at least 33 bytes to silence a GCC warning,
* only 4 are actually used */
unsigned char raw_data[33] = {0};
unsigned char *tga_palette = NULL;
/* Do I need to load a palette? */
if (tga_indexed)
{
int n;
/* Any data to skip? (offset usually = 0) */
rtga_skip(s, tga_palette_start );
/* Load the palette */
tga_palette = (unsigned char*)malloc(tga_palette_len * tga_palette_bits / 8);
if (!tga_palette)
{
free(tga_data);
return NULL;
}
n = tga_palette_len * tga_palette_bits / 8;
if (s->img_buffer+n <= s->img_buffer_end)
{
memcpy(tga_palette, s->img_buffer, n);
s->img_buffer += n;
}
else
{
free(tga_data);
free(tga_palette);
return NULL;
}
}
/* load the data */
for (i=0; i < tga_width * tga_height; ++i)
{
/* if I'm in RLE mode, do I need to get a RLE rtga_png chunk? */
if (tga_is_RLE)
{
if (RLE_count == 0)
{
/* yep, get the next byte as a RLE command */
int RLE_cmd = rtga_get8(s);
RLE_count = 1 + (RLE_cmd & 127);
RLE_repeating = RLE_cmd >> 7;
read_next_pixel = 1;
}
else if (!RLE_repeating)
read_next_pixel = 1;
}
else
read_next_pixel = 1;
/* OK, if I need to read a pixel, do it now */
if (read_next_pixel)
{
/* load however much data we did have */
if (tga_indexed)
{
/* read in 1 byte, then perform the lookup */
int pal_idx = rtga_get8(s);
if (pal_idx >= tga_palette_len) /* invalid index */
pal_idx = 0;
pal_idx *= tga_bits_per_pixel / 8;
for (j = 0; j*8 < tga_bits_per_pixel; ++j)
raw_data[j] = tga_palette[pal_idx+j];
}
else
{
/* read in the data raw */
for (j = 0; j*8 < tga_bits_per_pixel; ++j)
raw_data[j] = rtga_get8(s);
}
/* clear the reading flag for the next pixel */
read_next_pixel = 0;
} /* end of reading a pixel */
/* copy data */
for (j = 0; j < tga_comp; ++j)
tga_data[i*tga_comp+j] = raw_data[j];
/* in case we're in RLE mode, keep counting down */
--RLE_count;
}
/* do I need to invert the image? */
if (tga_inverted)
{
if (tga_data)
{
for (j = 0; j*2 < tga_height; ++j)
{
int index1 = j * tga_width * tga_comp;
int index2 = (tga_height - 1 - j) * tga_width * tga_comp;
for (i = tga_width * tga_comp; i > 0; --i)
{
unsigned char temp = tga_data[index1];
tga_data[index1] = tga_data[index2];
tga_data[index2] = temp;
++index1;
++index2;
}
}
}
}
/* Clear my palette, if I had one */
if (tga_palette)
free(tga_palette);
}
/* swap RGB */
if (tga_comp >= 3)
{
int i;
unsigned char* tga_pixel = tga_data;
for (i = 0; i < tga_width * tga_height; ++i)
{
unsigned char temp = tga_pixel[0];
tga_pixel[0] = tga_pixel[2];
tga_pixel[2] = temp;
tga_pixel += tga_comp;
}
}
/* convert to target component count */
if ( (req_comp)
&& (req_comp >= 1 && req_comp <= 4)
&& (req_comp != tga_comp))
{
tga_data = rtga_convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height);
}
return tga_data;
}
static uint8_t *rtga_load_from_memory(uint8_t const *buffer, int len,
unsigned *x, unsigned *y, int *comp, int req_comp)
{
rtga_context s;
s.img_buffer = (uint8_t *)buffer;
s.img_buffer_original = (uint8_t *) buffer;
s.img_buffer_end = (uint8_t *) buffer+len;
return rtga_tga_load(&s,x,y,comp,req_comp);
}
int rtga_process_image(rtga_t *rtga, void **buf_data,
size_t size, unsigned *width, unsigned *height)
{
int comp;
unsigned size_tex = 0;
if (!rtga)
return IMAGE_PROCESS_ERROR;
rtga->output_image = (uint32_t*)rtga_load_from_memory(rtga->buff_data,
(int)size, width, height, &comp, 4);
*buf_data = rtga->output_image;
size_tex = (*width) * (*height);
/* Convert RGBA to ARGB */
while (size_tex--)
{
unsigned int texel = rtga->output_image[size_tex];
unsigned int A = texel & 0xFF000000;
unsigned int B = texel & 0x00FF0000;
unsigned int G = texel & 0x0000FF00;
unsigned int R = texel & 0x000000FF;
((unsigned int*)rtga->output_image)[size_tex] = A | (R << 16) | G | (B >> 16);
};
return IMAGE_PROCESS_END;
}
bool rtga_set_buf_ptr(rtga_t *rtga, void *data)
{
if (!rtga)
return false;
rtga->buff_data = (uint8_t*)data;
return true;
}
void rtga_free(rtga_t *rtga)
{
if (!rtga)
return;
free(rtga);
}
rtga_t *rtga_alloc(void)
{
rtga_t *rtga = (rtga_t*)calloc(1, sizeof(*rtga));
if (!rtga)
return NULL;
return rtga;
}
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