archive/blender-archive
Archived
1
1
Fork 0
Code Pull Requests Packages Activity
This repository has been archived on 2023-10-09. You can view files and clone it, but cannot push or open issues or pull requests.
Files
b3dabc200a4b0399ec6b81f2ff2730d07b44fcaa
blender-archive/source/blender/imbuf/intern/png.c
Campbell Barton de13d0a80c doxygen: add newline after \file 
While \file doesn't need an argument, it can't have another doxy
command after it.
2019-02-18 08:22:12 +11:00

775 lines
21 KiB
C
Raw Blame History

/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*/
/** \file
* \ingroup imbuf
*
* \todo Save floats as 16 bits per channel, currently readonly.
*/
#include "png.h"
#include "BLI_utildefines.h"
#include "BLI_fileops.h"
#include "BLI_math.h"
#include "BKE_global.h"
#include "BKE_idprop.h"
#include "MEM_guardedalloc.h"
#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"
#include "IMB_allocimbuf.h"
#include "IMB_metadata.h"
#include "IMB_filetype.h"
#include "IMB_colormanagement.h"
#include "IMB_colormanagement_intern.h"
typedef struct PNGReadStruct {
const unsigned char *data;
unsigned int size;
unsigned int seek;
} PNGReadStruct;
static void ReadData(png_structp png_ptr, png_bytep data, png_size_t length);
static void WriteData(png_structp png_ptr, png_bytep data, png_size_t length);
static void Flush(png_structp png_ptr);
BLI_INLINE unsigned short UPSAMPLE_8_TO_16(const unsigned char _val)
{
return (_val << 8) + _val;
}
int imb_is_a_png(const unsigned char *mem)
{
int ret_val = 0;
if (mem) {
#if (PNG_LIBPNG_VER_MAJOR == 1) && (PNG_LIBPNG_VER_MINOR == 2)
/* Older version of libpng doesn't use const pointer to memory. */
ret_val = !png_sig_cmp((png_bytep)mem, 0, 8);
#else
ret_val = !png_sig_cmp(mem, 0, 8);
#endif
}
return(ret_val);
}
static void Flush(png_structp png_ptr)
{
(void)png_ptr;
}
static void WriteData(png_structp png_ptr, png_bytep data, png_size_t length)
{
ImBuf *ibuf = (ImBuf *) png_get_io_ptr(png_ptr);
/* if buffer is to small increase it. */
while (ibuf->encodedsize + length > ibuf->encodedbuffersize) {
imb_enlargeencodedbufferImBuf(ibuf);
}
memcpy(ibuf->encodedbuffer + ibuf->encodedsize, data, length);
ibuf->encodedsize += length;
}
static void ReadData(png_structp png_ptr, png_bytep data, png_size_t length)
{
PNGReadStruct *rs = (PNGReadStruct *) png_get_io_ptr(png_ptr);
if (rs) {
if (length <= rs->size - rs->seek) {
memcpy(data, rs->data + rs->seek, length);
rs->seek += length;
return;
}
}
printf("Reached EOF while decoding PNG\n");
longjmp(png_jmpbuf(png_ptr), 1);
}
static float channel_colormanage_noop(float value)
{
return value;
}
/* wrap to avoid macro calling functions multiple times */
BLI_INLINE unsigned short ftoshort(float val)
{
return unit_float_to_ushort_clamp(val);
}
int imb_savepng(struct ImBuf *ibuf, const char *name, int flags)
{
png_structp png_ptr;
png_infop info_ptr;
unsigned char *pixels = NULL;
unsigned char *from, *to;
unsigned short *pixels16 = NULL, *to16;
float *from_float, from_straight[4];
png_bytepp row_pointers = NULL;
int i, bytesperpixel, color_type = PNG_COLOR_TYPE_GRAY;
FILE *fp = NULL;
bool is_16bit = (ibuf->foptions.flag & PNG_16BIT) != 0;
bool has_float = (ibuf->rect_float != NULL);
int channels_in_float = ibuf->channels ? ibuf->channels : 4;
float (*chanel_colormanage_cb)(float);
size_t num_bytes;
/* use the jpeg quality setting for compression */
int compression;
compression = (int)(((float)(ibuf->foptions.quality) / 11.1111f));
compression = compression < 0 ? 0 : (compression > 9 ? 9 : compression);
if (ibuf->float_colorspace || (ibuf->colormanage_flag & IMB_COLORMANAGE_IS_DATA)) {
/* float buffer was managed already, no need in color space conversion */
chanel_colormanage_cb = channel_colormanage_noop;
}
else {
/* standard linear-to-srgb conversion if float buffer wasn't managed */
chanel_colormanage_cb = linearrgb_to_srgb;
}
/* for prints */
if (flags & IB_mem)
name = "<memory>";
bytesperpixel = (ibuf->planes + 7) >> 3;
if ((bytesperpixel > 4) || (bytesperpixel == 2)) {
printf("imb_savepng: Unsupported bytes per pixel: %d for file: '%s'\n", bytesperpixel, name);
return (0);
}
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
if (png_ptr == NULL) {
printf("imb_savepng: Cannot png_create_write_struct for file: '%s'\n", name);
return 0;
}
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
printf("imb_savepng: Cannot png_create_info_struct for file: '%s'\n", name);
return 0;
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_write_struct(&png_ptr, &info_ptr);
printf("imb_savepng: Cannot setjmp for file: '%s'\n", name);
return 0;
}
/* copy image data */
num_bytes = ((size_t)ibuf->x) * ibuf->y * bytesperpixel;
if (is_16bit)
pixels16 = MEM_mallocN(num_bytes * sizeof(unsigned short), "png 16bit pixels");
else
pixels = MEM_mallocN(num_bytes * sizeof(unsigned char), "png 8bit pixels");
if (pixels == NULL && pixels16 == NULL) {
png_destroy_write_struct(&png_ptr, &info_ptr);
printf("imb_savepng: Cannot allocate pixels array of %dx%d, %d bytes per pixel for file: '%s'\n", ibuf->x, ibuf->y, bytesperpixel, name);
return 0;
}
from = (unsigned char *) ibuf->rect;
to = pixels;
from_float = ibuf->rect_float;
to16 = pixels16;
switch (bytesperpixel) {
case 4:
color_type = PNG_COLOR_TYPE_RGBA;
if (is_16bit) {
if (has_float) {
if (channels_in_float == 4) {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
premul_to_straight_v4_v4(from_straight, from_float);
to16[0] = ftoshort(chanel_colormanage_cb(from_straight[0]));
to16[1] = ftoshort(chanel_colormanage_cb(from_straight[1]));
to16[2] = ftoshort(chanel_colormanage_cb(from_straight[2]));
to16[3] = ftoshort(chanel_colormanage_cb(from_straight[3]));
to16 += 4; from_float += 4;
}
}
else if (channels_in_float == 3) {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to16[0] = ftoshort(chanel_colormanage_cb(from_float[0]));
to16[1] = ftoshort(chanel_colormanage_cb(from_float[1]));
to16[2] = ftoshort(chanel_colormanage_cb(from_float[2]));
to16[3] = 65535;
to16 += 4; from_float += 3;
}
}
else {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to16[0] = ftoshort(chanel_colormanage_cb(from_float[0]));
to16[2] = to16[1] = to16[0];
to16[3] = 65535;
to16 += 4; from_float++;
}
}
}
else {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to16[0] = UPSAMPLE_8_TO_16(from[0]);
to16[1] = UPSAMPLE_8_TO_16(from[1]);
to16[2] = UPSAMPLE_8_TO_16(from[2]);
to16[3] = UPSAMPLE_8_TO_16(from[3]);
to16 += 4; from += 4;
}
}
}
else {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to[0] = from[0];
to[1] = from[1];
to[2] = from[2];
to[3] = from[3];
to += 4; from += 4;
}
}
break;
case 3:
color_type = PNG_COLOR_TYPE_RGB;
if (is_16bit) {
if (has_float) {
if (channels_in_float == 4) {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
premul_to_straight_v4_v4(from_straight, from_float);
to16[0] = ftoshort(chanel_colormanage_cb(from_straight[0]));
to16[1] = ftoshort(chanel_colormanage_cb(from_straight[1]));
to16[2] = ftoshort(chanel_colormanage_cb(from_straight[2]));
to16 += 3; from_float += 4;
}
}
else if (channels_in_float == 3) {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to16[0] = ftoshort(chanel_colormanage_cb(from_float[0]));
to16[1] = ftoshort(chanel_colormanage_cb(from_float[1]));
to16[2] = ftoshort(chanel_colormanage_cb(from_float[2]));
to16 += 3; from_float += 3;
}
}
else {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to16[0] = ftoshort(chanel_colormanage_cb(from_float[0]));
to16[2] = to16[1] = to16[0];
to16 += 3; from_float++;
}
}
}
else {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to16[0] = UPSAMPLE_8_TO_16(from[0]);
to16[1] = UPSAMPLE_8_TO_16(from[1]);
to16[2] = UPSAMPLE_8_TO_16(from[2]);
to16 += 3; from += 4;
}
}
}
else {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to[0] = from[0];
to[1] = from[1];
to[2] = from[2];
to += 3; from += 4;
}
}
break;
case 1:
color_type = PNG_COLOR_TYPE_GRAY;
if (is_16bit) {
if (has_float) {
float rgb[3];
if (channels_in_float == 4) {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
premul_to_straight_v4_v4(from_straight, from_float);
rgb[0] = chanel_colormanage_cb(from_straight[0]);
rgb[1] = chanel_colormanage_cb(from_straight[1]);
rgb[2] = chanel_colormanage_cb(from_straight[2]);
to16[0] = ftoshort(IMB_colormanagement_get_luminance(rgb));
to16++; from_float += 4;
}
}
else if (channels_in_float == 3) {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
rgb[0] = chanel_colormanage_cb(from_float[0]);
rgb[1] = chanel_colormanage_cb(from_float[1]);
rgb[2] = chanel_colormanage_cb(from_float[2]);
to16[0] = ftoshort(IMB_colormanagement_get_luminance(rgb));
to16++; from_float += 3;
}
}
else {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to16[0] = ftoshort(chanel_colormanage_cb(from_float[0]));
to16++; from_float++;
}
}
}
else {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to16[0] = UPSAMPLE_8_TO_16(from[0]);
to16++; from += 4;
}
}
}
else {
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to[0] = from[0];
to++; from += 4;
}
}
break;
}
if (flags & IB_mem) {
/* create image in memory */
imb_addencodedbufferImBuf(ibuf);
ibuf->encodedsize = 0;
png_set_write_fn(png_ptr,
(png_voidp) ibuf,
WriteData,
Flush);
}
else {
fp = BLI_fopen(name, "wb");
if (!fp) {
png_destroy_write_struct(&png_ptr, &info_ptr);
if (pixels)
MEM_freeN(pixels);
if (pixels16)
MEM_freeN(pixels16);
printf("imb_savepng: Cannot open file for writing: '%s'\n", name);
return 0;
}
png_init_io(png_ptr, fp);
}
#if 0
png_set_filter(png_ptr, 0,
PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE |
PNG_FILTER_SUB | PNG_FILTER_VALUE_SUB |
PNG_FILTER_UP | PNG_FILTER_VALUE_UP |
PNG_FILTER_AVG | PNG_FILTER_VALUE_AVG |
PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH |
PNG_ALL_FILTERS);
#endif
png_set_compression_level(png_ptr, compression);
/* png image settings */
png_set_IHDR(png_ptr,
info_ptr,
ibuf->x,
ibuf->y,
is_16bit ? 16 : 8,
color_type,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
/* image text info */
if (ibuf->metadata) {
png_text *metadata;
IDProperty *prop;
int num_text = 0;
for (prop = ibuf->metadata->data.group.first; prop; prop = prop->next) {
if (prop->type == IDP_STRING) {
num_text++;
}
}
metadata = MEM_callocN(num_text * sizeof(png_text), "png_metadata");
num_text = 0;
for (prop = ibuf->metadata->data.group.first; prop; prop = prop->next) {
if (prop->type == IDP_STRING) {
metadata[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
metadata[num_text].key = prop->name;
metadata[num_text].text = IDP_String(prop);
num_text++;
}
}
png_set_text(png_ptr, info_ptr, metadata, num_text);
MEM_freeN(metadata);
}
if (ibuf->ppm[0] > 0.0 && ibuf->ppm[1] > 0.0) {
png_set_pHYs(png_ptr, info_ptr, (unsigned int)(ibuf->ppm[0] + 0.5), (unsigned int)(ibuf->ppm[1] + 0.5), PNG_RESOLUTION_METER);
}
/* write the file header information */
png_write_info(png_ptr, info_ptr);
#ifdef __LITTLE_ENDIAN__
png_set_swap(png_ptr);
#endif
/* allocate memory for an array of row-pointers */
row_pointers = (png_bytepp) MEM_mallocN(ibuf->y * sizeof(png_bytep), "row_pointers");
if (row_pointers == NULL) {
printf("imb_savepng: Cannot allocate row-pointers array for file '%s'\n", name);
png_destroy_write_struct(&png_ptr, &info_ptr);
if (pixels)
MEM_freeN(pixels);
if (pixels16)
MEM_freeN(pixels16);
if (fp) {
fclose(fp);
}
return 0;
}
/* set the individual row-pointers to point at the correct offsets */
if (is_16bit) {
for (i = 0; i < ibuf->y; i++) {
row_pointers[ibuf->y - 1 - i] = (png_bytep)
((unsigned short *)pixels16 + (((size_t)i) * ibuf->x) * bytesperpixel);
}
}
else {
for (i = 0; i < ibuf->y; i++) {
row_pointers[ibuf->y - 1 - i] = (png_bytep)
((unsigned char *)pixels + (((size_t)i) * ibuf->x) * bytesperpixel * sizeof(unsigned char));
}
}
/* write out the entire image data in one call */
png_write_image(png_ptr, row_pointers);
/* write the additional chunks to the PNG file (not really needed) */
png_write_end(png_ptr, info_ptr);
/* clean up */
if (pixels)
MEM_freeN(pixels);
if (pixels16)
MEM_freeN(pixels16);
MEM_freeN(row_pointers);
png_destroy_write_struct(&png_ptr, &info_ptr);
if (fp) {
fflush(fp);
fclose(fp);
}
return(1);
}
static void imb_png_warning(png_structp UNUSED(png_ptr), png_const_charp message)
{
/* We suppress iCCP warnings. That's how Blender always used to behave,
* and with new libpng it became too much picky, giving a warning on
* the splash screen even.
*/
if ((G.debug & G_DEBUG) == 0 && STREQLEN(message, "iCCP", 4)) {
return;
}
fprintf(stderr, "libpng warning: %s\n", message);
}
static void imb_png_error(png_structp UNUSED(png_ptr), png_const_charp message)
{
fprintf(stderr, "libpng error: %s\n", message);
}
ImBuf *imb_loadpng(const unsigned char *mem, size_t size, int flags, char colorspace[IM_MAX_SPACE])
{
struct ImBuf *ibuf = NULL;
png_structp png_ptr;
png_infop info_ptr;
unsigned char *pixels = NULL;
unsigned short *pixels16 = NULL;
png_bytepp row_pointers = NULL;
png_uint_32 width, height;
int bit_depth, color_type;
PNGReadStruct ps;
unsigned char *from, *to;
unsigned short *from16;
float *to_float;
unsigned int channels;
if (imb_is_a_png(mem) == 0) return(NULL);
/* both 8 and 16 bit PNGs are default to standard byte colorspace */
colorspace_set_default_role(colorspace, IM_MAX_SPACE, COLOR_ROLE_DEFAULT_BYTE);
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
if (png_ptr == NULL) {
printf("Cannot png_create_read_struct\n");
return NULL;
}
png_set_error_fn(png_ptr, NULL, imb_png_error, imb_png_warning);
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
png_destroy_read_struct(&png_ptr, (png_infopp)NULL,
(png_infopp)NULL);
printf("Cannot png_create_info_struct\n");
return NULL;
}
ps.size = size; /* XXX, 4gig limit! */
ps.data = mem;
ps.seek = 0;
png_set_read_fn(png_ptr, (void *) &ps, ReadData);
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
if (pixels) MEM_freeN(pixels);
if (pixels16) MEM_freeN(pixels16);
if (row_pointers) MEM_freeN(row_pointers);
if (ibuf) IMB_freeImBuf(ibuf);
return NULL;
}
// png_set_sig_bytes(png_ptr, 8);
png_read_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
&color_type, NULL, NULL, NULL);
channels = png_get_channels(png_ptr, info_ptr);
switch (color_type) {
case PNG_COLOR_TYPE_RGB:
case PNG_COLOR_TYPE_RGB_ALPHA:
break;
case PNG_COLOR_TYPE_PALETTE:
png_set_palette_to_rgb(png_ptr);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
channels = 4;
}
else {
channels = 3;
}
break;
case PNG_COLOR_TYPE_GRAY:
case PNG_COLOR_TYPE_GRAY_ALPHA:
if (bit_depth < 8) {
png_set_expand(png_ptr);
bit_depth = 8;
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
/* PNG_COLOR_TYPE_GRAY may also have alpha 'values', like with palette. */
channels = 2;
}
}
break;
default:
printf("PNG format not supported\n");
longjmp(png_jmpbuf(png_ptr), 1);
}
ibuf = IMB_allocImBuf(width, height, 8 * channels, 0);
if (ibuf) {
ibuf->ftype = IMB_FTYPE_PNG;
if (bit_depth == 16)
ibuf->foptions.flag |= PNG_16BIT;
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_pHYs)) {
int unit_type;
png_uint_32 xres, yres;
if (png_get_pHYs(png_ptr, info_ptr, &xres, &yres, &unit_type)) {
if (unit_type == PNG_RESOLUTION_METER) {
ibuf->ppm[0] = xres;
ibuf->ppm[1] = yres;
}
}
}
}
else {
printf("Couldn't allocate memory for PNG image\n");
}
if (ibuf && ((flags & IB_test) == 0)) {
if (bit_depth == 16) {
imb_addrectfloatImBuf(ibuf);
png_set_swap(png_ptr);
pixels16 = imb_alloc_pixels(ibuf->x, ibuf->y, channels, sizeof(png_uint_16), "pixels");
if (pixels16 == NULL || ibuf->rect_float == NULL) {
printf("Cannot allocate pixels array\n");
longjmp(png_jmpbuf(png_ptr), 1);
}
/* allocate memory for an array of row-pointers */
row_pointers = (png_bytepp) MEM_mallocN((size_t)ibuf->y * sizeof(png_uint_16p), "row_pointers");
if (row_pointers == NULL) {
printf("Cannot allocate row-pointers array\n");
longjmp(png_jmpbuf(png_ptr), 1);
}
/* set the individual row-pointers to point at the correct offsets */
for (size_t i = 0; i < ibuf->y; i++) {
row_pointers[ibuf->y - 1 - i] = (png_bytep)
((png_uint_16 *)pixels16 + (i * ibuf->x) * channels);
}
png_read_image(png_ptr, row_pointers);
/* copy image data */
to_float = ibuf->rect_float;
from16 = pixels16;
switch (channels) {
case 4:
for (size_t i = (size_t)ibuf->x * (size_t)ibuf->y; i > 0; i--) {
to_float[0] = from16[0] / 65535.0;
to_float[1] = from16[1] / 65535.0;
to_float[2] = from16[2] / 65535.0;
to_float[3] = from16[3] / 65535.0;
to_float += 4; from16 += 4;
}
break;
case 3:
for (size_t i = (size_t)ibuf->x * (size_t)ibuf->y; i > 0; i--) {
to_float[0] = from16[0] / 65535.0;
to_float[1] = from16[1] / 65535.0;
to_float[2] = from16[2] / 65535.0;
to_float[3] = 1.0;
to_float += 4; from16 += 3;
}
break;
case 2:
for (size_t i = (size_t)ibuf->x * (size_t)ibuf->y; i > 0; i--) {
to_float[0] = to_float[1] = to_float[2] = from16[0] / 65535.0;
to_float[3] = from16[1] / 65535.0;
to_float += 4; from16 += 2;
}
break;
case 1:
for (size_t i = (size_t)ibuf->x * (size_t)ibuf->y; i > 0; i--) {
to_float[0] = to_float[1] = to_float[2] = from16[0] / 65535.0;
to_float[3] = 1.0;
to_float += 4; from16++;
}
break;
}
}
else {
imb_addrectImBuf(ibuf);
pixels = imb_alloc_pixels(ibuf->x, ibuf->y, channels, sizeof(unsigned char), "pixels");
if (pixels == NULL || ibuf->rect == NULL) {
printf("Cannot allocate pixels array\n");
longjmp(png_jmpbuf(png_ptr), 1);
}
/* allocate memory for an array of row-pointers */
row_pointers = (png_bytepp) MEM_mallocN((size_t)ibuf->y * sizeof(png_bytep), "row_pointers");
if (row_pointers == NULL) {
printf("Cannot allocate row-pointers array\n");
longjmp(png_jmpbuf(png_ptr), 1);
}
/* set the individual row-pointers to point at the correct offsets */
for (int i = 0; i < ibuf->y; i++) {
row_pointers[ibuf->y - 1 - i] = (png_bytep)
((unsigned char *)pixels + (((size_t)i) * ibuf->x) * channels * sizeof(unsigned char));
}
png_read_image(png_ptr, row_pointers);
/* copy image data */
to = (unsigned char *) ibuf->rect;
from = pixels;
switch (channels) {
case 4:
for (size_t i = (size_t)ibuf->x * (size_t)ibuf->y; i > 0; i--) {
to[0] = from[0];
to[1] = from[1];
to[2] = from[2];
to[3] = from[3];
to += 4; from += 4;
}
break;
case 3:
for (size_t i = (size_t)ibuf->x * (size_t)ibuf->y; i > 0; i--) {
to[0] = from[0];
to[1] = from[1];
to[2] = from[2];
to[3] = 0xff;
to += 4; from += 3;
}
break;
case 2:
for (size_t i = (size_t)ibuf->x * (size_t)ibuf->y; i > 0; i--) {
to[0] = to[1] = to[2] = from[0];
to[3] = from[1];
to += 4; from += 2;
}
break;
case 1:
for (size_t i = (size_t)ibuf->x * (size_t)ibuf->y; i > 0; i--) {
to[0] = to[1] = to[2] = from[0];
to[3] = 0xff;
to += 4; from++;
}
break;
}
}
if (flags & IB_metadata) {
png_text *text_chunks;
int count = png_get_text(png_ptr, info_ptr, &text_chunks, NULL);
IMB_metadata_ensure(&ibuf->metadata);
for (int i = 0; i < count; i++) {
IMB_metadata_set_field(ibuf->metadata, text_chunks[i].key, text_chunks[i].text);
ibuf->flags |= IB_metadata;
}
}
png_read_end(png_ptr, info_ptr);
}
/* clean up */
if (pixels)
MEM_freeN(pixels);
if (pixels16)
MEM_freeN(pixels16);
if (row_pointers)
MEM_freeN(row_pointers);
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
return(ibuf);
}
View Git Blame Copy Permalink