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(rbmp.c) Simplify
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twinaphex
parent
1344e91286
commit
90dca2d537
@ -35,26 +35,21 @@
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#include <formats/image.h>
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#include <formats/rbmp.h>
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typedef struct
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{
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int (*read) (void *user,char *data,int size);
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void (*skip) (void *user,int n);
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int (*eof) (void *user);
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} rbmp_io_callbacks;
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/* truncate int to byte without warnings */
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#define RBMP__BYTECAST(x) ((unsigned char) ((x) & 255))
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typedef struct
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{
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uint32_t img_x, img_y;
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int img_n, img_out_n;
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uint32_t img_x;
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uint32_t img_y;
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int img_n;
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int img_out_n;
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rbmp_io_callbacks io;
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void *io_user_data;
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int read_from_callbacks;
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int buflen;
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unsigned char buffer_start[128];
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unsigned char *img_buffer, *img_buffer_end;
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unsigned char *img_buffer;
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unsigned char *img_buffer_end;
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unsigned char *img_buffer_original;
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} rbmp__context;
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@ -62,62 +57,13 @@ struct rbmp
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{
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uint8_t *buff_data;
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uint32_t *output_image;
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void *empty;
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};
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static void rbmp__refill_buffer(rbmp__context *s);
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/* initialize a memory-decode context */
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static void rbmp__start_mem(rbmp__context *s, unsigned char const *buffer, int len)
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{
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s->io.read = NULL;
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s->read_from_callbacks = 0;
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s->img_buffer = (unsigned char*)buffer;
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s->img_buffer_original = (unsigned char*)buffer;
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s->img_buffer_end = (unsigned char*)buffer+len;
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}
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static unsigned char *rbmp__bmp_load(rbmp__context *s, unsigned *x, unsigned *y,
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int *comp, int req_comp);
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static unsigned char *rbmp_load_from_memory(unsigned char const *buffer, int len,
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unsigned *x, unsigned *y, int *comp, int req_comp)
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{
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rbmp__context s;
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rbmp__start_mem(&s,buffer,len);
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return rbmp__bmp_load(&s,x,y,comp,req_comp);
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}
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static void rbmp__refill_buffer(rbmp__context *s)
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{
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int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen);
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if (n == 0)
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{
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/* at end of file, treat same as if from memory, but need to handle case
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* where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file */
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s->read_from_callbacks = 0;
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s->img_buffer = s->buffer_start;
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s->img_buffer_end = s->buffer_start+1;
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*s->img_buffer = 0;
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}
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else
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{
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s->img_buffer = s->buffer_start;
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s->img_buffer_end = s->buffer_start + n;
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}
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}
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static INLINE unsigned char rbmp__get8(rbmp__context *s)
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{
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if (s->img_buffer < s->img_buffer_end)
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return *s->img_buffer++;
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if (s->read_from_callbacks)
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{
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rbmp__refill_buffer(s);
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return *s->img_buffer++;
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}
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return 0;
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}
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@ -129,16 +75,6 @@ static void rbmp__skip(rbmp__context *s, int n)
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return;
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}
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if (s->io.read)
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{
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int blen = (int) (s->img_buffer_end - s->img_buffer);
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if (blen < n)
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{
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s->img_buffer = s->img_buffer_end;
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(s->io.skip)(s->io_user_data, n - blen);
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return;
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}
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}
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s->img_buffer += n;
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}
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@ -154,9 +90,6 @@ static uint32_t rbmp__get32le(rbmp__context *s)
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return z + (rbmp__get16le(s) << 16);
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}
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/* truncate int to byte without warnings */
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#define RBMP__BYTECAST(x) ((unsigned char) ((x) & 255))
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static unsigned char rbmp__compute_y(int r, int g, int b)
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{
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return (unsigned char) (((r*77) + (g*150) + (29*b)) >> 8);
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@ -172,18 +105,12 @@ static unsigned char *rbmp__convert_format(
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int i,j;
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unsigned char *good;
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if (req_comp == img_n)
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return data;
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retro_assert(req_comp >= 1 && req_comp <= 4);
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good = (unsigned char *) malloc(req_comp * x * y);
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if (good == NULL)
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{
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/* Out of memory */
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free(data);
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return 0;
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}
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good = (unsigned char *)malloc(req_comp * x * y);
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if (!good)
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goto error;
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for (j=0; j < (int) y; ++j)
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{
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@ -249,6 +176,11 @@ static unsigned char *rbmp__convert_format(
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free(data);
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return good;
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error:
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/* Out of memory */
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free(data);
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return NULL;
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}
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/* Microsoft/Windows BMP image */
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@ -506,10 +438,16 @@ static unsigned char *rbmp__bmp_load(rbmp__context *s, unsigned *x, unsigned *y,
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int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0;
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int z = 0;
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int easy=0;
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rbmp__skip(s, offset - 14 - hsz);
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if (bpp == 24) width = 3 * s->img_x;
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else if (bpp == 16) width = 2*s->img_x;
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else /* bpp = 32 and pad = 0 */ width=0;
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if (bpp == 24)
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width = 3 * s->img_x;
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else if (bpp == 16)
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width = 2*s->img_x;
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else /* bpp = 32 and pad = 0 */
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width=0;
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pad = (-width) & 3;
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switch (bpp)
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@ -535,10 +473,14 @@ static unsigned char *rbmp__bmp_load(rbmp__context *s, unsigned *x, unsigned *y,
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}
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/* right shift amt to put high bit in position #7 */
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rshift = rbmp__high_bit(mr)-7; rcount = rbmp__bitcount(mr);
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gshift = rbmp__high_bit(mg)-7; gcount = rbmp__bitcount(mg);
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bshift = rbmp__high_bit(mb)-7; bcount = rbmp__bitcount(mb);
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ashift = rbmp__high_bit(ma)-7; acount = rbmp__bitcount(ma);
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rshift = rbmp__high_bit(mr)-7;
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rcount = rbmp__bitcount(mr);
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gshift = rbmp__high_bit(mg)-7;
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gcount = rbmp__bitcount(mg);
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bshift = rbmp__high_bit(mb)-7;
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bcount = rbmp__bitcount(mb);
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ashift = rbmp__high_bit(ma)-7;
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acount = rbmp__bitcount(ma);
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}
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for (j=0; j < (int) s->img_y; ++j)
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{
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@ -552,7 +494,8 @@ static unsigned char *rbmp__bmp_load(rbmp__context *s, unsigned *x, unsigned *y,
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out[z+0] = rbmp__get8(s);
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z += 3;
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a = (easy == 2 ? rbmp__get8(s) : 255);
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if (target == 4) out[z++] = a;
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if (target == 4)
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out[z++] = a;
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}
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}
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else
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@ -565,7 +508,8 @@ static unsigned char *rbmp__bmp_load(rbmp__context *s, unsigned *x, unsigned *y,
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out[z++] = RBMP__BYTECAST(rbmp__shiftsigned(v & mg, gshift, gcount));
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out[z++] = RBMP__BYTECAST(rbmp__shiftsigned(v & mb, bshift, bcount));
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a = (ma ? rbmp__shiftsigned(v & ma, ashift, acount) : 255);
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if (target == 4) out[z++] = RBMP__BYTECAST(a);
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if (target == 4)
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out[z++] = RBMP__BYTECAST(a);
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}
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}
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rbmp__skip(s, pad);
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@ -588,16 +532,32 @@ static unsigned char *rbmp__bmp_load(rbmp__context *s, unsigned *x, unsigned *y,
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if (req_comp && req_comp != target)
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{
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out = rbmp__convert_format(out, target, req_comp, s->img_x, s->img_y);
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if (out == NULL)
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if (!out)
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return out; /* rbmp__convert_format frees input on failure */
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}
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*x = s->img_x;
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*y = s->img_y;
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if (comp) *comp = s->img_n;
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if (comp)
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*comp = s->img_n;
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return out;
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}
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static unsigned char *rbmp_load_from_memory(unsigned char const *buffer, int len,
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unsigned *x, unsigned *y, int *comp, int req_comp)
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{
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rbmp__context s;
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s.img_buffer = (unsigned char*)buffer;
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s.img_buffer_original = (unsigned char*)buffer;
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s.img_buffer_end = (unsigned char*)buffer+len;
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return rbmp__bmp_load(&s,x,y,comp,req_comp);
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}
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static void rbmp_convert_frame(uint32_t *frame, unsigned width, unsigned height)
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{
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uint32_t *end = frame + (width * height * sizeof(uint32_t))/4;
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