/**
* This saves the image to its specified destination.
* @param im A handle to an opened Epeg image.
*
* This saves the image @p im to its destination specified by
* epeg_file_output_set() or epeg_memory_output_set(). The image will be
* encoded at the deoded pixel size, using the quality, comment and thumbnail
* comment settings set on the image.
*
* retval 1 - error scale
* 2 - error encode
* 3 - error decode
* 4 - error decode ( setjmp )
*/
EAPI int
epeg_encode(Epeg_Image *im)
{
int ret;
if ((ret = _epeg_decode(im)) != 0)
return (ret == 2 ? 4 : 3);
if (_epeg_scale(im) != 0)
return 1;
if (_epeg_encode(im) != 0)
return 2;
return 0;
}
/**
* Get a segment of decoded pixels from an image.
* @param im A handle to an opened Epeg image.
* @param x Rectangle X.
* @param y Rectangle Y.
* @param w Rectangle width.
* @param h Rectangle height.
* @return Pointer to the top left of the requested pixel block.
*
* Return image pixels in the decoded format from the specified location
* rectangle bounded with the box @p x, @p y @p w X @p y. The pixel block is
* packed with no row padding, and it organsied from top-left to bottom right,
* row by row. You must free the pixel block using epeg_pixels_free() before
* you close the image handle, and assume the pixels to be read-only memory.
*
* On success the pointer is returned, on failure, NULL is returned. Failure
* may be because the rectangle is out of the bounds of the image, memory
* allocations failed or the image data cannot be decoded.
*
*/
const void *
epeg_pixels_get(Epeg_Image *im)
{
int xx, yy, bpp, w, h;
unsigned int *pix, *p;
if (!im->pixels)
{
if (_epeg_decode(im) != 0) return NULL;
}
if (!im->pixels) return NULL;
if ((im->out.w < 1) || (im->out.h < 1)) return NULL;
if (_epeg_scale(im) != 0) return NULL;
bpp = im->in.jinfo.output_components;
w = im->out.w;
h = im->out.h;
pix = malloc(w * h * 4);
if (!pix) return NULL;
for (yy = 0; yy < h; yy++)
{
unsigned char *s;
s = im->lines[yy];
p = pix + ((((yy) * w)));
for (xx = 0; xx < w; xx++)
{
p[0] = 0xff000000 | (s[0] << 16) | (s[1] << 8) | (s[2]);
p++;
s += bpp;
}
}
return pix;
}
/**
* Get a segment of decoded pixels from an image.
* @param im A handle to an opened Epeg image.
* @param x Rectangle X.
* @param y Rectangle Y.
* @param w Rectangle width.
* @param h Rectangle height.
* @return Pointer to the top left of the requested pixel block.
*
* Return image pixels in the decoded format from the specified location
* rectangle bounded with the box @p x, @p y @p w X @p y. The pixel block is
* packed with no row padding, and it organsied from top-left to bottom right,
* row by row. You must free the pixel block using epeg_pixels_free() before
* you close the image handle, and assume the pixels to be read-only memory.
*
* On success the pointer is returned, on failure, NULL is returned. Failure
* may be because the rectangle is out of the bounds of the image, memory
* allocations failed or the image data cannot be decoded.
*
*/
EAPI const void *
epeg_pixels_get(Epeg_Image *im, int x, int y, int w, int h) {
int xx, yy, ww, hh, bpp, ox, oy, ow, oh, iw, ih;
if (!im->pixels) {
if (_epeg_decode(im) != 0) {
return NULL;
}
}
if (!im->pixels) {
return NULL;
}
if ((im->out.w < 1) || (im->out.h < 1)) {
return NULL;
}
if (_epeg_scale(im) != 0) {
return NULL;
}
bpp = im->in.jinfo.output_components;
iw = im->out.w;
ih = im->out.h;
ow = w;
oh = h;
ox = 0;
oy = 0;
if ((x + ow) > iw) {
ow = iw - x;
}
if ((y + oh) > ih) {
oh = ih - y;
}
if (ow < 1) {
return NULL;
}
if (oh < 1) {
return NULL;
}
if (x < 0) {
ow += x;
ox = -x;
}
if (y < 0) {
oh += y;
oy = -y;
}
if (ow < 1) {
return NULL;
}
if (oh < 1) {
return NULL;
}
ww = x + ox + ow;
hh = y + oy + oh;
if (im->color_space == EPEG_GRAY8) {
unsigned char *pix, *p;
pix = malloc(w * h * 1);
if (!pix) {
return NULL;
}
for (yy = y + oy; yy < hh; yy++) {
unsigned char *s;
s = im->lines[yy] + ((x + ox) * bpp);
p = pix + ((((yy - y) * w) + ox));
for (xx = x + ox; xx < ww; xx++) {
p[0] = s[0];
p++;
s += bpp;
}
}
return pix;
} else if (im->color_space == EPEG_YUV8) {
unsigned char *pix, *p;
pix = malloc(w * h * 3);
if (!pix) {
return NULL;
}
for (yy = y + oy; yy < hh; yy++) {
unsigned char *s;
s = im->lines[yy] + ((x + ox) * bpp);
p = pix + ((((yy - y) * w) + ox) * 3);
for (xx = x + ox; xx < ww; xx++) {
p[0] = s[0];
p[1] = s[1];
p[2] = s[2];
p += 3;
s += bpp;
}
}
return pix;
} else if (im->color_space == EPEG_RGB8) {
unsigned char *pix, *p;
pix = malloc(w * h * 3);
if (!pix) {
return NULL;
}
for (yy = y + oy; yy < hh; yy++) {
unsigned char *s;
s = im->lines[yy] + ((x + ox) * bpp);
p = pix + ((((yy - y) * w) + ox) * 3);
for (xx = x + ox; xx < ww; xx++) {
p[0] = s[0];
p[1] = s[1];
p[2] = s[2];
p += 3;
s += bpp;
}
}
return pix;
} else if (im->color_space == EPEG_BGR8) {
unsigned char *pix, *p;
pix = malloc(w * h * 3);
if (!pix) {
return NULL;
}
for (yy = y + oy; yy < hh; yy++) {
unsigned char *s;
s = im->lines[yy] + ((x + ox) * bpp);
p = pix + ((((yy - y) * w) + ox) * 3);
for (xx = x + ox; xx < ww; xx++) {
p[0] = s[2];
p[1] = s[1];
p[2] = s[0];
p += 3;
s += bpp;
}
}
return pix;
} else if (im->color_space == EPEG_RGBA8) {
unsigned char *pix, *p;
pix = malloc(w * h * 4);
if (!pix) {
return NULL;
}
for (yy = y + oy; yy < hh; yy++) {
unsigned char *s;
s = im->lines[yy] + ((x + ox) * bpp);
p = pix + ((((yy - y) * w) + ox) * 4);
for (xx = x + ox; xx < ww; xx++) {
p[0] = s[0];
p[1] = s[1];
p[2] = s[2];
p[3] = 0xff;
p += 4;
s += bpp;
}
}
return pix;
} else if (im->color_space == EPEG_BGRA8) {
unsigned char *pix, *p;
pix = malloc(w * h * 4);
if (!pix) {
return NULL;
}
for (yy = y + oy; yy < hh; yy++) {
unsigned char *s;
s = im->lines[yy] + ((x + ox) * bpp);
p = pix + ((((yy - y) * w) + ox) * 4);
for (xx = x + ox; xx < ww; xx++) {
p[0] = 0xff;
p[1] = s[2];
p[2] = s[1];
p[3] = s[0];
p += 4;
s += bpp;
}
}
return pix;
} else if (im->color_space == EPEG_ARGB32) {
unsigned int *pix, *p;
pix = malloc(w * h * 4);
if (!pix) {
return NULL;
}
for (yy = y + oy; yy < hh; yy++) {
unsigned char *s;
s = im->lines[yy] + ((x + ox) * bpp);
p = pix + ((((yy - y) * w) + ox));
for (xx = x + ox; xx < ww; xx++) {
p[0] = 0xff000000 | (s[0] << 16) | (s[1] << 8) | (s[2]);
p++;
s += bpp;
}
}
return pix;
} else if (im->color_space == EPEG_CMYK) {
unsigned char *pix, *p;
pix = malloc(w * h * 4);
if (!pix) {
return NULL;
}
for (yy = y + oy; yy < hh; yy++) {
unsigned char *s;
s = im->lines[yy] + ((x + ox) * bpp);
p = pix + ((((yy - y) * w) + ox) * 4);
for (xx = x + ox; xx < ww; xx++) {
p[0] = s[0];
p[1] = s[1];
p[2] = s[2];
p[3] = 0xff;
p += 4;
s += bpp;
}
}
return pix;
}
return NULL;
}