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image.cpp
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image.cpp
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/* Image library
*
* Copyright (c) 2016 Max Stepin
* maxst at users.sourceforge.net
*
* zlib license
* ------------
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "image.h"
#include "png.h"
#include "zlib.h"
int load_png(wchar_t * szName, Image * image)
{
FILE * f;
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!png_ptr || !info_ptr)
return 1;
if ((f = _wfopen(szName, L"rb")) == 0)
{
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return 1;
}
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
fclose(f);
return 1;
}
png_init_io(png_ptr, f);
png_read_info(png_ptr, info_ptr);
unsigned int depth = png_get_bit_depth(png_ptr, info_ptr);
if (depth < 8)
{
if (png_get_color_type(png_ptr, info_ptr) == PNG_COLOR_TYPE_PALETTE)
png_set_packing(png_ptr);
else
png_set_expand(png_ptr);
}
else
if (depth > 8)
{
png_set_expand(png_ptr);
png_set_strip_16(png_ptr);
}
(void)png_set_interlace_handling(png_ptr);
png_read_update_info(png_ptr, info_ptr);
unsigned int w = png_get_image_width(png_ptr, info_ptr);
unsigned int h = png_get_image_height(png_ptr, info_ptr);
unsigned int bpp = png_get_channels(png_ptr, info_ptr);
unsigned int type = png_get_color_type(png_ptr, info_ptr);
image->init(w, h, bpp, type);
png_colorp palette;
png_color_16p trans_color;
png_bytep trans_alpha;
if (png_get_PLTE(png_ptr, info_ptr, &palette, &image->ps))
memcpy(image->pl, palette, image->ps * 3);
if (png_get_tRNS(png_ptr, info_ptr, &trans_alpha, &image->ts, &trans_color) && image->ts > 0)
{
if (type == PNG_COLOR_TYPE_GRAY)
{
image->tr[0] = 0;
image->tr[1] = trans_color->gray & 0xFF;
image->ts = 2;
}
else
if (type == PNG_COLOR_TYPE_RGB)
{
image->tr[0] = 0;
image->tr[1] = trans_color->red & 0xFF;
image->tr[2] = 0;
image->tr[3] = trans_color->green & 0xFF;
image->tr[4] = 0;
image->tr[5] = trans_color->blue & 0xFF;
image->ts = 6;
}
else
if (type == PNG_COLOR_TYPE_PALETTE)
memcpy(image->tr, trans_alpha, image->ts);
}
png_read_image(png_ptr, image->rows);
png_read_end(png_ptr, info_ptr);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
fclose(f);
return 0;
}
int load_tga(wchar_t * szName, Image * image)
{
FILE * f;
unsigned int i, j, k, n;
unsigned int w, h;
unsigned int compressed, top_bottom;
unsigned char c;
unsigned char col[4];
unsigned char header[18];
if ((f = _wfopen(szName, L"rb")) == 0)
return 1;
if (fread(&header, 1, 18, f) != 18)
goto fail;
w = header[12] + header[13]*256;
h = header[14] + header[15]*256;
compressed = header[2] & 8;
top_bottom = header[17] & 0x20;
if ((header[2] & 7) == 1 && header[16] == 8 && header[1] == 1 && header[7] == 24)
image->init(w, h, 1, 3);
else
if ((header[2] & 7) == 3 && header[16] == 8)
image->init(w, h, 1, 0);
else
if ((header[2] & 7) == 2 && header[16] == 24)
image->init(w, h, 3, 2);
else
if ((header[2] & 7) == 2 && header[16] == 32)
image->init(w, h, 4, 6);
else
goto fail;
if (header[0] != 0)
fseek(f, header[0], SEEK_CUR);
if (header[1] == 1)
{
unsigned int start = header[3] + header[4]*256;
unsigned int size = header[5] + header[6]*256;
for (i=start; i<start+size && i<256; i++)
{
if (fread(&col, 1, 3, f) != 3)
goto fail;
image->pl[i].r = col[2];
image->pl[i].g = col[1];
image->pl[i].b = col[0];
}
image->ps = i;
if (start+size > 256)
fseek(f, (start+size-256)*3, SEEK_CUR);
}
for (j=0; j<h; j++)
{
unsigned char * row = image->rows[(top_bottom) ? j : h-1-j];
if (compressed == 0)
{
if (image->bpp >= 3)
{
for (i=0; i<w; i++)
{
if (fread(&col, 1, image->bpp, f) != image->bpp)
goto fail;
*row++ = col[2];
*row++ = col[1];
*row++ = col[0];
if (image->bpp == 4)
*row++ = col[3];
}
}
else
{
if (fread(row, 1, w, f) != w)
goto fail;
}
}
else
{
i = 0;
while (i < w)
{
if (fread(&c, 1, 1, f) != 1)
goto fail;
n = (c & 0x7F)+1;
if ((c & 0x80) != 0)
{
if (image->bpp >= 3)
{
if (fread(&col, 1, image->bpp, f) != image->bpp)
goto fail;
for (k=0; k<n; k++)
{
*row++ = col[2];
*row++ = col[1];
*row++ = col[0];
if (image->bpp == 4)
*row++ = col[3];
}
}
else
{
if (fread(&col, 1, 1, f) != 1)
goto fail;
memset(row, col[0], n);
row += n;
}
}
else
{
if (image->bpp >= 3)
{
for (k=0; k<n; k++)
{
if (fread(&col, 1, image->bpp, f) != image->bpp)
goto fail;
*row++ = col[2];
*row++ = col[1];
*row++ = col[0];
if (image->bpp == 4)
*row++ = col[3];
}
}
else
{
if (fread(row, 1, n, f) != n)
goto fail;
row += n;
}
}
i+=n;
}
}
}
fclose(f);
return 0;
fail:
fclose(f);
return 1;
}
int load_image(wchar_t * szName, Image * image)
{
FILE * f;
if ((f = _wfopen(szName, L"rb")) != 0)
{
unsigned int sign;
size_t res = fread(&sign, sizeof(sign), 1, f);
fclose(f);
if (res == 1)
{
if (sign == 0x474E5089)
return load_png(szName, image);
else
return load_tga(szName, image);
}
}
return 1;
}
unsigned char find_common_coltype(std::vector<Image>& img)
{
unsigned char coltype = img[0].type;
for (size_t i=1; i<img.size(); i++)
{
if (img[0].ps != img[i].ps || memcmp(img[0].pl, img[i].pl, img[0].ps*3) != 0)
coltype = 6;
else
if (img[0].ts != img[i].ts || memcmp(img[0].tr, img[i].tr, img[0].ts) != 0)
coltype = 6;
else
if (img[i].type != 3)
{
if (coltype != 3)
coltype |= img[i].type;
else
coltype = 6;
}
else
if (coltype != 3)
coltype = 6;
}
return coltype;
}
void up0to6(Image * image)
{
image->type = 6;
image->bpp = 4;
unsigned int x, y;
unsigned char g, a;
unsigned char * sp, * dp;
unsigned int rowbytes = image->w *image->bpp;
unsigned char * dst = new unsigned char[image->h * rowbytes];
for (y=0; y<image->h; y++)
{
sp = image->rows[y];
image->rows[y] = (y == 0) ? dst : image->rows[y-1] + rowbytes;
dp = image->rows[y];
for (x=0; x<image->w; x++)
{
g = *sp++;
a = (image->ts > 0 && image->tr[1] == g) ? 0 : 255;
*dp++ = g;
*dp++ = g;
*dp++ = g;
*dp++ = a;
}
}
delete[] image->p;
image->p = dst;
}
void up2to6(Image * image)
{
image->type = 6;
image->bpp = 4;
unsigned int x, y;
unsigned char r, g, b, a;
unsigned char * sp, * dp;
unsigned int rowbytes = image->w *image->bpp;
unsigned char * dst = new unsigned char[image->h * rowbytes];
for (y=0; y<image->h; y++)
{
sp = image->rows[y];
image->rows[y] = (y == 0) ? dst : image->rows[y-1] + rowbytes;
dp = image->rows[y];
for (x=0; x<image->w; x++)
{
r = *sp++;
g = *sp++;
b = *sp++;
a = (image->ts > 0 && image->tr[1] == r && image->tr[3] == g && image->tr[5] == b) ? 0 : 255;
*dp++ = r;
*dp++ = g;
*dp++ = b;
*dp++ = a;
}
}
delete[] image->p;
image->p = dst;
}
void up3to6(Image * image)
{
image->type = 6;
image->bpp = 4;
unsigned int x, y;
unsigned char * sp, * dp;
unsigned int rowbytes = image->w *image->bpp;
unsigned char * dst = new unsigned char[image->h * rowbytes];
for (y=0; y<image->h; y++)
{
sp = image->rows[y];
image->rows[y] = (y == 0) ? dst : image->rows[y-1] + rowbytes;
dp = image->rows[y];
for (x=0; x<image->w; x++)
{
*dp++ = image->pl[*sp].r;
*dp++ = image->pl[*sp].g;
*dp++ = image->pl[*sp].b;
*dp++ = image->tr[*sp++];
}
}
delete[] image->p;
image->p = dst;
}
void up4to6(Image * image)
{
image->type = 6;
image->bpp = 4;
unsigned int x, y;
unsigned char * sp, * dp;
unsigned int rowbytes = image->w *image->bpp;
unsigned char * dst = new unsigned char[image->h * rowbytes];
for (y=0; y<image->h; y++)
{
sp = image->rows[y];
image->rows[y] = (y == 0) ? dst : image->rows[y-1] + rowbytes;
dp = image->rows[y];
for (x=0; x<image->w; x++)
{
*dp++ = *sp;
*dp++ = *sp;
*dp++ = *sp++;
*dp++ = *sp++;
}
}
delete[] image->p;
image->p = dst;
}
void up0to4(Image * image)
{
image->type = 4;
image->bpp = 2;
unsigned int x, y;
unsigned char * sp, * dp;
unsigned int rowbytes = image->w *image->bpp;
unsigned char * dst = new unsigned char[image->h * rowbytes];
for (y=0; y<image->h; y++)
{
sp = image->rows[y];
image->rows[y] = (y == 0) ? dst : image->rows[y-1] + rowbytes;
dp = image->rows[y];
for (x=0; x<image->w; x++)
{
*dp++ = *sp++;
*dp++ = 255;
}
}
delete[] image->p;
image->p = dst;
}
void up0to2(Image * image)
{
image->type = 2;
image->bpp = 3;
unsigned int x, y;
unsigned char * sp, * dp;
unsigned int rowbytes = image->w *image->bpp;
unsigned char * dst = new unsigned char[image->h * rowbytes];
for (y=0; y<image->h; y++)
{
sp = image->rows[y];
image->rows[y] = (y == 0) ? dst : image->rows[y-1] + rowbytes;
dp = image->rows[y];
for (x=0; x<image->w; x++)
{
*dp++ = *sp;
*dp++ = *sp;
*dp++ = *sp++;
}
}
delete[] image->p;
image->p = dst;
}
void optim_upconvert(Image * image, unsigned char coltype)
{
if (image->type == 0 && coltype == 6)
up0to6(image);
else
if (image->type == 2 && coltype == 6)
up2to6(image);
else
if (image->type == 3 && coltype == 6)
up3to6(image);
else
if (image->type == 4 && coltype == 6)
up4to6(image);
else
if (image->type == 0 && coltype == 4)
up0to4(image);
else
if (image->type == 0 && coltype == 2)
up0to2(image);
}
void optim_dirty_transp(Image * image)
{
unsigned int x, y;
if (image->type == 6)
{
for (y=0; y<image->h; y++)
{
unsigned char * sp = image->rows[y];
for (x=0; x<image->w; x++, sp+=4)
{
if (sp[3] == 0)
sp[0] = sp[1] = sp[2] = 0;
}
}
}
else
if (image->type == 4)
{
for (y=0; y<image->h; y++)
{
unsigned char * sp = image->rows[y];
for (x=0; x<image->w; x++, sp+=2)
{
if (sp[1] == 0)
sp[0] = 0;
}
}
}
}
int different(Image * image1, Image * image2)
{
return memcmp(image1->p, image2->p, image1->w * image1->h * image1->bpp);
}
void optim_duplicates(std::vector<Image>& img, unsigned int first)
{
unsigned int i = first;
while (++i < img.size())
{
if (different(&img[i-1], &img[i]))
continue;
i--;
unsigned int num = img[i].delay_num;
unsigned int den = img[i].delay_den;
img[i].free();
img.erase(img.begin() + i);
if (img[i].delay_den == den)
img[i].delay_num += num;
else
{
img[i].delay_num = num = num*img[i].delay_den + den*img[i].delay_num;
img[i].delay_den = den = den*img[i].delay_den;
while (num && den)
{
if (num > den)
num = num % den;
else
den = den % num;
}
num += den;
img[i].delay_num /= num;
img[i].delay_den /= num;
}
}
}
typedef struct { unsigned int num; unsigned char r, g, b, a; } COLORS;
int cmp_colors(const void *arg1, const void *arg2)
{
if ( ((COLORS*)arg1)->a != ((COLORS*)arg2)->a )
return (int)(((COLORS*)arg1)->a) - (int)(((COLORS*)arg2)->a);
if ( ((COLORS*)arg1)->num != ((COLORS*)arg2)->num )
return (int)(((COLORS*)arg2)->num) - (int)(((COLORS*)arg1)->num);
if ( ((COLORS*)arg1)->r != ((COLORS*)arg2)->r )
return (int)(((COLORS*)arg1)->r) - (int)(((COLORS*)arg2)->r);
if ( ((COLORS*)arg1)->g != ((COLORS*)arg2)->g )
return (int)(((COLORS*)arg1)->g) - (int)(((COLORS*)arg2)->g);
return (int)(((COLORS*)arg1)->b) - (int)(((COLORS*)arg2)->b);
}
void down6(std::vector<Image>& img)
{
unsigned int i, k, x, y;
unsigned char * sp;
unsigned char * dp;
unsigned char r, g, b, a;
int simple_transp = 1;
int full_transp = 0;
int grayscale = 1;
unsigned char cube[4096];
unsigned char gray[256];
COLORS col[256];
unsigned int colors = 0;
Image * image = &img[0];
memset(&cube, 0, sizeof(cube));
memset(&gray, 0, sizeof(gray));
for (i=0; i<256; i++)
{
col[i].num = 0;
col[i].r = col[i].g = col[i].b = i;
col[i].a = image->tr[i] = 255;
}
for (i=0; i<img.size(); i++)
{
for (y=0; y<image->h; y++)
{
sp = img[i].rows[y];
for (x=0; x<image->w; x++)
{
r = *sp++;
g = *sp++;
b = *sp++;
a = *sp++;
if (a != 0)
{
if (a != 255)
simple_transp = 0;
else
if (((r | g | b) & 15) == 0)
cube[(r<<4) + g + (b>>4)] = 1;
if (r != g || g != b)
grayscale = 0;
else
gray[r] = 1;
}
else
full_transp = 1;
if (colors <= 256)
{
int found = 0;
for (k=0; k<colors; k++)
if (col[k].r == r && col[k].g == g && col[k].b == b && col[k].a == a)
{
found = 1;
col[k].num++;
break;
}
if (found == 0)
{
if (colors < 256)
{
col[colors].num++;
col[colors].r = r;
col[colors].g = g;
col[colors].b = b;
col[colors].a = a;
}
colors++;
}
}
}
}
}
if (colors <= 256)
{
if (grayscale && simple_transp && colors > 128) /* 6 -> 0 */
{
image->type = 0;
image->bpp = 1;
unsigned char t = 0;
for (i=0; i<256; i++)
if (gray[i] == 0)
{
image->tr[0] = 0;
image->tr[1] = t = i;
image->ts = 2;
break;
}
for (i=0; i<img.size(); i++)
{
for (y=0; y<image->h; y++)
{
sp = dp = img[i].rows[y];
for (x=0; x<image->w; x++, sp+=4)
{
*dp++ = (sp[3] == 0) ? t : sp[0];
}
}
}
}
else /* 6 -> 3 */
{
image->type = 3;
image->bpp = 1;
if (full_transp == 0 && colors < 256)
col[colors++].a = 0;
qsort(&col[0], colors, sizeof(COLORS), cmp_colors);
for (i=0; i<img.size(); i++)
{
for (y=0; y<image->h; y++)
{
sp = dp = img[i].rows[y];
for (x=0; x<image->w; x++)
{
r = *sp++;
g = *sp++;
b = *sp++;
a = *sp++;
for (k=0; k<colors; k++)
if (col[k].r == r && col[k].g == g && col[k].b == b && col[k].a == a)
break;
*dp++ = k;
}
}
}
image->ps = colors;
for (i=0; i<colors; i++)
{
image->pl[i].r = col[i].r;
image->pl[i].g = col[i].g;
image->pl[i].b = col[i].b;
image->tr[i] = col[i].a;
if (image->tr[i] != 255)
image->ts = i+1;
}
}
}
else
if (grayscale) /* 6 -> 4 */
{
image->type = 4;
image->bpp = 2;
for (i=0; i<img.size(); i++)
{
for (y=0; y<image->h; y++)
{
sp = dp = img[i].rows[y];
for (x=0; x<image->w; x++, sp+=4)
{
*dp++ = sp[2];
*dp++ = sp[3];
}
}
}
}
else
if (simple_transp) /* 6 -> 2 */
{
for (i=0; i<4096; i++)
if (cube[i] == 0)
{
image->tr[0] = 0;
image->tr[1] = (i>>4)&0xF0;
image->tr[2] = 0;
image->tr[3] = i&0xF0;
image->tr[4] = 0;
image->tr[5] = (i<<4)&0xF0;
image->ts = 6;
break;
}
if (image->ts != 0)
{
image->type = 2;
image->bpp = 3;
for (i=0; i<img.size(); i++)
{
for (y=0; y<image->h; y++)
{
sp = dp = img[i].rows[y];
for (x=0; x<image->w; x++)
{
r = *sp++;
g = *sp++;
b = *sp++;
a = *sp++;
if (a == 0)
{
*dp++ = image->tr[1];
*dp++ = image->tr[3];
*dp++ = image->tr[5];
}
else
{
*dp++ = r;
*dp++ = g;
*dp++ = b;
}
}
}
}
}
}
}
void down2(std::vector<Image>& img)
{
unsigned int i, k, x, y;
unsigned char * sp;
unsigned char * dp;
unsigned char r, g, b, a;
int full_transp = 0;
int grayscale = 1;
unsigned char gray[256];
COLORS col[256];
unsigned int colors = 0;
Image * image = &img[0];
memset(&gray, 0, sizeof(gray));
for (i=0; i<256; i++)
{
col[i].num = 0;
col[i].r = col[i].g = col[i].b = i;
col[i].a = 255;
}
for (i=0; i<img.size(); i++)
{
for (y=0; y<image->h; y++)
{
sp = img[i].rows[y];
for (x=0; x<image->w; x++)
{
r = *sp++;
g = *sp++;
b = *sp++;
a = (image->ts > 0 && image->tr[1] == r && image->tr[3] == g && image->tr[5] == b) ? 0 : 255;
if (a != 0)
{
if (r != g || g != b)
grayscale = 0;
else
gray[r] = 1;
}
else
full_transp = 1;
if (colors <= 256)
{
int found = 0;
for (k=0; k<colors; k++)
if (col[k].r == r && col[k].g == g && col[k].b == b && col[k].a == a)
{
found = 1;
col[k].num++;
break;
}
if (found == 0)
{
if (colors < 256)
{
col[colors].num++;
col[colors].r = r;
col[colors].g = g;
col[colors].b = b;
col[colors].a = a;
}
colors++;
}
}
}
}
}
if (colors <= 256)
{
if (grayscale && colors > 128) /* 2 -> 0 */
{
image->type = 0;
image->bpp = 1;
unsigned char t = 0;
int ts = 0;
for (i=0; i<256; i++)
{
if (gray[i] == 0)
{
t = i;
ts = 2;
break;
}
}
for (i=0; i<img.size(); i++)
{
for (y=0; y<image->h; y++)
{
sp = dp = img[i].rows[y];
for (x=0; x<image->w; x++, sp+=3)
{
*dp++ = (image->ts > 0 && image->tr[1] == sp[0] && image->tr[3] == sp[1] && image->tr[5] == sp[2]) ? t : sp[0];
}
}
}
if (ts > 0)
{
image->tr[0] = 0;
image->tr[1] = t;
image->ts = ts;
}
}
else /* 2 -> 3 */
{
image->type = 3;
image->bpp = 1;
if (full_transp == 0 && colors < 256)
col[colors++].a = 0;
qsort(&col[0], colors, sizeof(COLORS), cmp_colors);
for (i=0; i<img.size(); i++)
{
for (y=0; y<image->h; y++)
{
sp = dp = img[i].rows[y];
for (x=0; x<image->w; x++)
{
r = *sp++;
g = *sp++;
b = *sp++;
a = (image->ts > 0 && image->tr[1] == r && image->tr[3] == g && image->tr[5] == b) ? 0 : 255;
for (k=0; k<colors; k++)
if (col[k].r == r && col[k].g == g && col[k].b == b && col[k].a == a)
break;
*dp++ = k;
}
}
}
image->ps = colors;
for (i=0; i<colors; i++)
{
image->pl[i].r = col[i].r;
image->pl[i].g = col[i].g;
image->pl[i].b = col[i].b;
image->tr[i] = col[i].a;
if (image->tr[i] != 255)
image->ts = i+1;
}
}
}
}
void down4(std::vector<Image>& img)
{
unsigned int i, k, x, y;
unsigned char * sp;
unsigned char * dp;
unsigned char g, a;
int simple_transp = 1;
int full_transp = 0;
unsigned char gray[256];
COLORS col[256];
unsigned int colors = 0;
Image * image = &img[0];
memset(&gray, 0, sizeof(gray));
for (i=0; i<256; i++)
{
col[i].num = 0;
col[i].r = col[i].g = col[i].b = i;
col[i].a = image->tr[i] = 255;
}
for (i=0; i<img.size(); i++)
{
for (y=0; y<image->h; y++)
{
sp = img[i].rows[y];
for (x=0; x<image->w; x++)
{
g = *sp++;
a = *sp++;
if (a != 0)
{
if (a != 255)
simple_transp = 0;
else
gray[g] = 1;
}
else
full_transp = 1;
if (colors <= 256)
{
int found = 0;
for (k=0; k<colors; k++)
if (col[k].g == g && col[k].a == a)
{
found = 1;
col[k].num++;
break;
}
if (found == 0)
{