[pcsx_rearmed.git] / deps / libretro-common / formats / tga / rtga.c

/* 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;
}
Commit	Line	Data
3719602c PC	1	/* Copyright (C) 2010-2020 The RetroArch team
	2	*
	3	* ---------------------------------------------------------------------------------------
	4	* The following license statement only applies to this file (rtga.c).
	5	* ---------------------------------------------------------------------------------------
	6	*
	7	* Permission is hereby granted, free of charge,
	8	* to any person obtaining a copy of this software and associated documentation files (the "Software"),
	9	* to deal in the Software without restriction, including without limitation the rights to
	10	* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
	11	* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
	14	*
	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
	16	* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
	18	* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
	19	* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	20	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	21	*/
	22
	23	/* Modified version of stb_image's TGA sources. */
	24
	25	#include <stdio.h>
	26	#include <stdint.h>
	27	#include <stdarg.h>
	28	#include <stddef.h> /* ptrdiff_t on osx */
	29	#include <stdlib.h>
	30	#include <string.h>
	31
	32	#include <retro_inline.h>
	33
	34	#include <formats/image.h>
	35	#include <formats/rtga.h>
	36
	37	#define RTGA_COMPUTE_Y(r, g, b) ((uint8_t)((((r) * 77) + ((g) * 150) + (29 * (b))) >> 8))
	38
	39	struct rtga
	40	{
	41	uint8_t *buff_data;
	42	uint32_t *output_image;
	43	};
	44
	45	typedef struct
	46	{
	47	uint8_t *img_buffer;
	48	uint8_t *img_buffer_end;
	49	uint8_t *img_buffer_original;
	50	int buflen;
	51	int img_n, img_out_n;
	52	uint32_t img_x, img_y;
	53	uint8_t buffer_start[128];
	54	} rtga_context;
	55
	56	static INLINE uint8_t rtga_get8(rtga_context *s)
	57	{
	58	if (s->img_buffer < s->img_buffer_end)
	59	return *s->img_buffer++;
	60	return 0;
	61	}
	62
	63	static void rtga_skip(rtga_context *s, int n)
	64	{
65	if (n < 0)
66	{
67	s->img_buffer = s->img_buffer_end;
68	return;
69	}
70	s->img_buffer += n;
71	}
72
73	static int rtga_get16le(rtga_context *s)
74	{
75	return rtga_get8(s) + (rtga_get8(s) << 8);
76	}
77
78	static unsigned char *rtga_convert_format(
79	unsigned char *data,
80	int img_n,
81	int req_comp,
82	unsigned int x,
83	unsigned int y)
84	{
85	int i,j;
86	unsigned char good = (unsigned char ) malloc(req_comp * x * y);
87
88	if (!good)
89	{
90	free(data);
91	return NULL;
92	}
93
94	for (j=0; j < (int) y; ++j)
95	{
96	unsigned char src = data + j x * img_n ;
97	unsigned char dest = good + j x * req_comp;
98
99	switch (((img_n)*8+(req_comp)))
100	{
101	case ((1)*8+(2)):
102	for (i=x-1; i >= 0; --i, src += 1, dest += 2)
103	{
104	dest[0]=src[0];
105	dest[1]=255;
106	}
107	break;
108	case ((1)*8+(3)):
109	for (i=x-1; i >= 0; --i, src += 1, dest += 3)
110	dest[0]=dest[1]=dest[2]=src[0];
111	break;
112	case ((1)*8+(4)):
113	for (i=x-1; i >= 0; --i, src += 1, dest += 4)
114	{
115	dest[0]=dest[1]=dest[2]=src[0];
116	dest[3]=255;
117	}
118	break;
119	case ((2)*8+(1)):
120	for (i=x-1; i >= 0; --i, src += 2, dest += 1)
121	dest[0]=src[0];
122	break;
123	case ((2)*8+(3)):
124	for (i=x-1; i >= 0; --i, src += 2, dest += 3)
125	dest[0]=dest[1]=dest[2]=src[0];
126	break;
127	case ((2)*8+(4)):
128	for (i=x-1; i >= 0; --i, src += 2, dest += 4)
129	{
130	dest[0]=dest[1]=dest[2]=src[0];
131	dest[3]=src[1];
132	}
133	break;
134	case ((3)*8+(4)):
135	for (i=x-1; i >= 0; --i, src += 3, dest += 4)
136	{
137	dest[0]=src[0];
138	dest[1]=src[1];
139	dest[2]=src[2];
140	dest[3]=255;
141	}
142	break;
143	case ((3)*8+(1)):
144	for (i=x-1; i >= 0; --i, src += 3, dest += 1)
145	dest[0] = RTGA_COMPUTE_Y(src[0],src[1],src[2]);
146	break;
147	case ((3)*8+(2)):
148	for (i=x-1; i >= 0; --i, src += 3, dest += 2)
149	{
150	dest[0] = RTGA_COMPUTE_Y(src[0],src[1],src[2]);
151	dest[1] = 255;
152	}
153	break;
154	case ((4)*8+(1)):
155	for (i=x-1; i >= 0; --i, src += 4, dest += 1)
156	dest[0] = RTGA_COMPUTE_Y(src[0],src[1],src[2]);
157	break;
158	case ((4)*8+(2)):
159	for (i=x-1; i >= 0; --i, src += 4, dest += 2)
160	{
161	dest[0] = RTGA_COMPUTE_Y(src[0],src[1],src[2]);
162	dest[1] = src[3];
163	}
164	break;
165	case ((4)*8+(3)):
166	for (i=x-1; i >= 0; --i, src += 4, dest += 3)
167	{
168	dest[0]=src[0];
169	dest[1]=src[1];
170	dest[2]=src[2];
171	}
172	break;
173	default:
174	break;
175	}
176	}
177
178	free(data);
179	return good;
180	}
181
182	static uint8_t rtga_tga_load(rtga_context s,
183	unsigned x, unsigned y, int *comp, int req_comp)
184	{
185	/* Read in the TGA header stuff */
186	int tga_offset = rtga_get8(s);
187	int tga_indexed = rtga_get8(s);
188	int tga_image_type = rtga_get8(s);
189	int tga_is_RLE = 0;
190	int tga_palette_start = rtga_get16le(s);
191	int tga_palette_len = rtga_get16le(s);
192	int tga_palette_bits = rtga_get8(s);
193	int tga_x_origin = rtga_get16le(s);
194	int tga_y_origin = rtga_get16le(s);
195	int tga_width = rtga_get16le(s);
196	int tga_height = rtga_get16le(s);
197	int tga_bits_per_pixel = rtga_get8(s);
198	int tga_comp = tga_bits_per_pixel / 8;
199	int tga_inverted = rtga_get8(s);
200
201	/* image data */
202	unsigned char *tga_data = NULL;
203
204	(void)tga_palette_start;
205	(void)tga_x_origin;
206	(void)tga_y_origin;
207
208	/* do a tiny bit of precessing */
209	if (tga_image_type >= 8)
210	{
211	tga_image_type -= 8;
212	tga_is_RLE = 1;
213	}
214
215	/* int tga_alpha_bits = tga_inverted & 15; */
216	tga_inverted = 1 - ((tga_inverted >> 5) & 1);
217
218	/* error check */
219	if (
220	(tga_width < 1) \|\| (tga_height < 1) \|\|
221	(tga_image_type < 1) \|\| (tga_image_type > 3) \|\|
222	(
223	(tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16) &&
224	(tga_bits_per_pixel != 24) && (tga_bits_per_pixel != 32)
225	)
226	)
227	return NULL; /* we don't report this as a bad TGA because we don't even know if it's TGA */
228
229	/* If paletted, then we will use the number of bits from the palette */
230	if (tga_indexed)
231	tga_comp = tga_palette_bits / 8;
232
233	/* TGA info */
234	*x = tga_width;
235	*y = tga_height;
236	if (comp)
237	*comp = tga_comp;
238
239	tga_data = (unsigned char)malloc((size_t)tga_width tga_height * tga_comp);
240	if (!tga_data)
241	return NULL;
242
243	/* skip to the data's starting position (offset usually = 0) */
244	rtga_skip(s, tga_offset );
245
246	if (!tga_indexed && !tga_is_RLE)
247	{
248	int i;
249	for (i=0; i < tga_height; ++i)
250	{
251	int _y = tga_inverted ? (tga_height -i - 1) : i;
252	uint8_t tga_row = tga_data + _y tga_width * tga_comp;
253	int n = tga_width * tga_comp;
254
255	if (s->img_buffer + n <= s->img_buffer_end)
256	{
257	memcpy(tga_row, s->img_buffer, n);
258	s->img_buffer += n;
259	}
260	}
261	}
262	else
263	{
264	int i, j;
265	int RLE_repeating = 0;
266	int RLE_count = 0;
267	int read_next_pixel = 1;
268	/* Needs to be at least 33 bytes to silence a GCC warning,
269	* only 4 are actually used */
270	unsigned char raw_data[33] = {0};
271	unsigned char *tga_palette = NULL;
272
273	/* Do I need to load a palette? */
274	if (tga_indexed)
275	{
276	int n;
277	/* Any data to skip? (offset usually = 0) */
278	rtga_skip(s, tga_palette_start );
279	/* Load the palette */
280	tga_palette = (unsigned char)malloc(tga_palette_len tga_palette_bits / 8);
281
282	if (!tga_palette)
283	{
284	free(tga_data);
285	return NULL;
286	}
287
288	n = tga_palette_len * tga_palette_bits / 8;
289
290	if (s->img_buffer+n <= s->img_buffer_end)
291	{
292	memcpy(tga_palette, s->img_buffer, n);
293	s->img_buffer += n;
294	}
295	else
296	{
297	free(tga_data);
298	free(tga_palette);
299	return NULL;
300	}
301	}
302
303	/* load the data */
304	for (i=0; i < tga_width * tga_height; ++i)
305	{
306	/* if I'm in RLE mode, do I need to get a RLE rtga_png chunk? */
307	if (tga_is_RLE)
308	{
309	if (RLE_count == 0)
310	{
311	/* yep, get the next byte as a RLE command */
312	int RLE_cmd = rtga_get8(s);
313	RLE_count = 1 + (RLE_cmd & 127);
314	RLE_repeating = RLE_cmd >> 7;
315	read_next_pixel = 1;
316	}
317	else if (!RLE_repeating)
318	read_next_pixel = 1;
319	}
320	else
321	read_next_pixel = 1;
322
323	/* OK, if I need to read a pixel, do it now */
324	if (read_next_pixel)
325	{
326	/* load however much data we did have */
327	if (tga_indexed)
328	{
329	/* read in 1 byte, then perform the lookup */
330	int pal_idx = rtga_get8(s);
331	if (pal_idx >= tga_palette_len) /* invalid index */
332	pal_idx = 0;
333	pal_idx *= tga_bits_per_pixel / 8;
334	for (j = 0; j*8 < tga_bits_per_pixel; ++j)
335	raw_data[j] = tga_palette[pal_idx+j];
336	}
337	else
338	{
339	/* read in the data raw */
340	for (j = 0; j*8 < tga_bits_per_pixel; ++j)
341	raw_data[j] = rtga_get8(s);
342	}
343
344	/* clear the reading flag for the next pixel */
345	read_next_pixel = 0;
346	} /* end of reading a pixel */
347
348	/* copy data */
349	for (j = 0; j < tga_comp; ++j)
350	tga_data[i*tga_comp+j] = raw_data[j];
351
352	/* in case we're in RLE mode, keep counting down */
353	--RLE_count;
354	}
355
356	/* do I need to invert the image? */
357	if (tga_inverted)
358	{
359	if (tga_data)
360	{
361	for (j = 0; j*2 < tga_height; ++j)
362	{
363	int index1 = j * tga_width * tga_comp;
364	int index2 = (tga_height - 1 - j) * tga_width * tga_comp;
365
366	for (i = tga_width * tga_comp; i > 0; --i)
367	{
368	unsigned char temp = tga_data[index1];
369	tga_data[index1] = tga_data[index2];
370	tga_data[index2] = temp;
371	++index1;
372	++index2;
373	}
374	}
375	}
376	}
377
378	/* Clear my palette, if I had one */
379	if (tga_palette)
380	free(tga_palette);
381	}
382
383	/* swap RGB */
384	if (tga_comp >= 3)
385	{
386	int i;
387	unsigned char* tga_pixel = tga_data;
388
389	for (i = 0; i < tga_width * tga_height; ++i)
390	{
391	unsigned char temp = tga_pixel[0];
392	tga_pixel[0] = tga_pixel[2];
393	tga_pixel[2] = temp;
394	tga_pixel += tga_comp;
395	}
396	}
397
398	/* convert to target component count */
399	if ( (req_comp)
400	&& (req_comp >= 1 && req_comp <= 4)
401	&& (req_comp != tga_comp))
402	{
403	tga_data = rtga_convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height);
404	}
405
406	return tga_data;
407	}
408
409	static uint8_t rtga_load_from_memory(uint8_t const buffer, int len,
410	unsigned x, unsigned y, int *comp, int req_comp)
411	{
412	rtga_context s;
413
414	s.img_buffer = (uint8_t *)buffer;
415	s.img_buffer_original = (uint8_t *) buffer;
416	s.img_buffer_end = (uint8_t *) buffer+len;
417
418	return rtga_tga_load(&s,x,y,comp,req_comp);
419	}
420
421	int rtga_process_image(rtga_t rtga, void *buf_data,
422	size_t size, unsigned width, unsigned height)
423	{
424	int comp;
425	unsigned size_tex = 0;
426
427	if (!rtga)
428	return IMAGE_PROCESS_ERROR;
429
430	rtga->output_image = (uint32_t*)rtga_load_from_memory(rtga->buff_data,
431	(int)size, width, height, &comp, 4);
432	*buf_data = rtga->output_image;
433	size_tex = (width) (*height);
434
435	/* Convert RGBA to ARGB */
436	while (size_tex--)
437	{
438	unsigned int texel = rtga->output_image[size_tex];
439	unsigned int A = texel & 0xFF000000;
440	unsigned int B = texel & 0x00FF0000;
441	unsigned int G = texel & 0x0000FF00;
442	unsigned int R = texel & 0x000000FF;
443	((unsigned int*)rtga->output_image)[size_tex] = A \| (R << 16) \| G \| (B >> 16);
444	};
445
446	return IMAGE_PROCESS_END;
447	}
448
449	bool rtga_set_buf_ptr(rtga_t rtga, void data)
450	{
451	if (!rtga)
452	return false;
453
454	rtga->buff_data = (uint8_t*)data;
455
456	return true;
457	}
458
459	void rtga_free(rtga_t *rtga)
460	{
461	if (!rtga)
462	return;
463
464	free(rtga);
465	}
466
467	rtga_t *rtga_alloc(void)
468	{
469	rtga_t rtga = (rtga_t)calloc(1, sizeof(*rtga));
470	if (!rtga)
471	return NULL;
472	return rtga;
473	}