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image.c
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image.c
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/*
Copyright (c) 2015 Harm Hanemaaijer <fgenfb@yahoo.com>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <float.h>
#include <malloc.h>
#include "texgenpack.h"
#include "decode.h"
#include "packing.h"
// Load image file or texture file. In the latter case, the texture is decoded into an image.
void load_image(const char *filename, int filetype, Image *image) {
if (filetype == FILE_TYPE_ASTC) {
decompress_astc_file(filename, image);
}
else
if (filetype & FILE_TYPE_TEXTURE_BIT) {
Texture texture;
switch (filetype) {
case FILE_TYPE_PKM :
load_pkm_file(filename, &texture);
break;
case FILE_TYPE_KTX :
load_ktx_file(filename, 1, &texture);
break;
case FILE_TYPE_DDS :
load_dds_file(filename, 1, &texture);
break;
case FILE_TYPE_ASTC :
load_astc_file(filename, &texture);
break;
default :
printf("Error -- no support for loading texture file format.\n");
exit(1);
}
const char *texture_type_str = texture_type_text(texture.type);
if (!option_quiet)
printf("Texture format: %s\n", texture_type_str);
set_texture_decoding_function(&texture, NULL);
convert_texture_to_image(&texture, image);
destroy_texture(&texture);
}
else {
switch (filetype) {
// case FILE_TYPE_PPM :
// load_ppm_file(filename, image);
// break;
case FILE_TYPE_PNG :
load_png_file(filename, image);
break;
default :
printf("Error -- no support for loading image file format.\n");
exit(1);
}
// Optionally convert to half-float format.
if (option_half_float)
convert_image_to_half_float(image);
}
}
// Load multiple mipmaps from a texture file. image must be an array big enough to hold max_images.
// Return the number of mipmap images.
int load_mipmap_images(const char *filename, int filetype, int max_images, Image *image) {
if (filetype & FILE_TYPE_TEXTURE_BIT) {
Texture *texture = (Texture *)alloca(sizeof(Texture) * max_images);
int n;
switch (filetype) {
case FILE_TYPE_KTX :
n = load_ktx_file(filename, max_images, &texture[0]);
break;
case FILE_TYPE_DDS :
n = load_dds_file(filename, max_images, &texture[0]);
break;
case FILE_TYPE_PKM :
load_pkm_file(filename, &texture[0]);
n = 1;
break;
case FILE_TYPE_ASTC :
load_astc_file(filename, &texture[0]);
n = 1;
break;
}
const char *texture_type_str = texture_type_text(texture[0].type);
if (!option_quiet)
printf("Texture format: %s\n", texture_type_str);
for (int i = 0; i < n; i++) {
set_texture_decoding_function(&texture[i], NULL);
convert_texture_to_image(&texture[i], &image[i]);
destroy_texture(&texture[i]);
}
return n;
}
printf("Error -- no method implemented for loading mipmaps from file %s.\n", filename);
exit(1);
}
// Save image file.
void save_image(Image *image, const char *filename, int filetype) {
switch (filetype) {
// case FILE_TYPE_PPM :
// load_ppm_file(filename, image);
// break;
case FILE_TYPE_PNG :
save_png_file(image, filename);
break;
default :
printf("Error -- no support for saving image file format.\n");
exit(1);
}
}
// Load multiple mipmaps from a texture file. texture must be an array big enough to hold max_texture.
// Return the number of mipmap images.
int load_texture(const char *filename, int filetype, int max_mipmaps, Texture *texture) {
if (filetype & FILE_TYPE_TEXTURE_BIT) {
int n;
switch (filetype) {
case FILE_TYPE_KTX :
n = load_ktx_file(filename, max_mipmaps, &texture[0]);
break;
case FILE_TYPE_DDS :
n = load_dds_file(filename, max_mipmaps, &texture[0]);
break;
case FILE_TYPE_PKM :
load_pkm_file(filename, &texture[0]);
n = 1;
break;
case FILE_TYPE_ASTC :
load_astc_file(filename, &texture[0]);
n = 1;
break;
}
const char *texture_type_str = texture_type_text(texture[0].type);
if (!option_quiet)
printf("Texture format: %s\n", texture_type_str);
for (int i = 0; i < n; i++)
set_texture_decoding_function(&texture[i], NULL);
return n;
}
printf("Error -- no method implemented for loading mipmaps from file %s.\n", filename);
exit(1);
}
// Save texture file.
void save_texture(Texture *texture, int nu_mipmaps, const char *filename, int filetype) {
switch (filetype) {
case FILE_TYPE_PKM :
if (texture->type != TEXTURE_TYPE_ETC1) {
printf("Error -- only ETC1 compression format supported in .pkm file.\n");
exit(1);
}
if (nu_mipmaps > 1)
printf("Warning: only saving first mipmap level.\n");
save_pkm_file(texture, filename);
break;
case FILE_TYPE_KTX :
if (!texture->info->ktx_support) {
printf("Error -- texture format not supported in .ktx file.\n");
exit(1);
}
save_ktx_file(texture, nu_mipmaps, filename);
break;
case FILE_TYPE_DDS :
if (!texture->info->dds_support) {
printf("Error -- texture format not supported in .dds file.\n");
exit(1);
}
save_dds_file(texture, nu_mipmaps, filename);
break;
case FILE_TYPE_ASTC :
if (!(texture->type & TEXTURE_TYPE_ASTC_BIT)) {
printf("Error -- .astc file format does not support texture format.\n");
exit(1);
}
save_astc_file(texture, filename);
break;
default :
printf("Error -- no support for saving texture file format.\n");
exit(1);
}
}
// Compare images. Must be the same size. Returns the RMSE. New version using block comparison functions.
double compare_images(Image *image1, Image *image2) {
int compare_alpha = 0;
if (image1->alpha_bits > 0 && image2->alpha_bits > 0)
compare_alpha = 1;
if (image1->nu_components != image2->nu_components) {
if ((image1->alpha_bits > 0 && image2->alpha_bits == 0 && image1->nu_components == image2->nu_components + 1) ||
(image1->alpha_bits == 0 && image2->alpha_bits > 0) && image1->nu_components + 1 == image2->nu_components)
printf("Warning: comparing images with and without alpha component.\n");
else
printf("Warning: comparing images with different number of components.\n");
}
if (image1->is_half_float ^ image2->is_half_float) {
// Allow exception for the case that image1 is half-float and image2 is in regular format.
if (!(image1->is_half_float && image2->bits_per_component == 8)) {
printf("Warning -- cannot compare regular and half-float images. Returning RMSE of 0 "
"by default. Try the --half-float option.\n");
return 0;
}
}
if (image1->bits_per_component != image2->bits_per_component) {
if (!(image1->is_half_float && image2->bits_per_component == 8) &&
!(image1->bits_per_component == 16 && image2->bits_per_component == 8)) {
printf("Warning -- cannot compare images with different number of bits per component "
"(%d vs %d). Returning RMSE of 0 by default.\n", image1->bits_per_component,
image2->bits_per_component);
return 0;
}
}
int nu_components = image1->nu_components;
if (image2->nu_components < image1->nu_components)
nu_components = image2->nu_components;
TextureComparisonFunction compare_func;
if (image1->bits_per_component == 16) {
if (image1->is_half_float && image2->is_half_float) {
calculate_half_float_table();
if (option_hdr) {
calculate_gamma_corrected_half_float_table();
if (compare_alpha)
compare_func = compare_block_4x4_rgba_half_float_hdr;
else
compare_func = compare_block_4x4_rgb_half_float_hdr;
}
else
if (compare_alpha)
compare_func = compare_block_4x4_rgba_half_float;
else
compare_func = compare_block_4x4_rgb_half_float;
}
else
if (image1->is_half_float && image2->bits_per_component == 8) {
// Comparison of half-float image with RGB(A)8 image.
calculate_normalized_float_table();
calculate_half_float_table();
if (compare_alpha)
compare_func = compare_block_4x4_rgba8_with_half_float;
else
compare_func = compare_block_4x4_rgb8_with_half_float;
}
else
if (image2->bits_per_component == 8)
if (image1->is_signed)
compare_func = compare_block_4x4_signed_8_bit_components_with_16_bit;
else
compare_func = compare_block_4x4_8_bit_components_with_16_bit;
else
if (image1->is_signed && image2->is_signed)
if (image1->nu_components == 2)
compare_func = compare_block_4x4_rg16_signed;
else
compare_func = compare_block_4x4_r16_signed;
else
if (image1->nu_components == 2)
compare_func = compare_block_4x4_rg16;
else
compare_func = compare_block_4x4_r16;
}
else // 8-bit components.
if (nu_components >= 3)
if (nu_components == 4)
compare_func = compare_block_4x4_rgba;
else
compare_func = compare_block_4x4_rgb;
else
if (image1->is_signed)
compare_func = compare_block_4x4_signed_8_bit_components;
else
compare_func = compare_block_4x4_8_bit_components;
BlockUserData block_user_data;
block_user_data.flags = 0;
block_user_data.image_pixels = image1->pixels;
if (image1->is_half_float)
block_user_data.image_rowstride = image1->extended_width * 8;
else
block_user_data.image_rowstride = image1->extended_width * 4;
Texture texture;
texture.width = image1->width;
texture.height = image1->height;
TextureInfo info;
info.nu_components = nu_components;
texture.info = &info;
block_user_data.texture = &texture;
double error = 0;
for (int y = 0; y < image1->height; y += 4)
for (int x = 0; x < image1->width; x += 4) {
int w;
if (x + 4 > image1->width)
w = image1->width - x;
else
w = 4;
int h;
if (y + 4 > image1->height)
h = image1->height - y;
else
h = 4;
block_user_data.x_offset = x;
block_user_data.y_offset = y;
unsigned int image_buffer[32];
if (image2->is_half_float)
for (int i = 0; i < h; i++)
memcpy(&image_buffer[i * 8], &image2->pixels[((y + i) * image2->extended_width +
x) * 2], w * 8);
else
for (int i = 0; i < h; i++)
memcpy(&image_buffer[i * 4], &image2->pixels[(y + i) * image2->extended_width +
x], w * 4);
error += 1 / compare_func(image_buffer, &block_user_data);
}
int n = image1->height * image1->width;
double rmse = sqrt((double)error / n);
double return_value = rmse;
if (!option_quiet || command == COMMAND_COMPARE) {
char *pixel_text;
if (image1->is_half_float)
if (option_hdr)
if (image1->alpha_bits > 0)
pixel_text = "HDR half-float RGBA";
else
pixel_text = "HDR half-float RGB";
else
if (image1->alpha_bits > 0)
pixel_text = "half-float RGBA";
else
pixel_text = "half-float RGB";
else
if (image1->bits_per_component == 16)
if (image1->nu_components == 2)
pixel_text = "R16G16";
else
pixel_text = "R16";
else
if (image1->nu_components == 2)
pixel_text = "R8G8";
else
if (image1->nu_components == 1)
pixel_text = "R8";
else
if (image1->nu_components == 3)
pixel_text = "RGB8";
else
pixel_text = "RGBA8";
printf("Root-mean-square error per %s pixel: %lf ", pixel_text, rmse);
double range;
if (image1->is_half_float)
range = 1.0;
else
if (image1->bits_per_component == 16)
range = 65535.0;
else
range = 255.0;
double psnr = 10.0 * log(range * range / ((double)error / (nu_components * n))) / log(10.0);
printf("PSNR: %lf\n", psnr);
}
return return_value;
}
// Destroy a texture.
void destroy_texture(Texture *texture) {
free(texture->pixels);
}
// Destroy an image.
void destroy_image(Image *image) {
free(image->pixels);
}
// Clone an image.
void clone_image(Image *image1, Image *image2) {
*image2 = *image1;
int size;
if (image1->is_half_float)
size = image1->height * image1->extended_width * 8;
else
size = image1->height * image1->extended_width * 4;
image2->pixels = (unsigned int *)malloc(size);
memcpy(image2->pixels, image1->pixels, size);
}
// Fill image with black and alpha of 1.
void clear_image(Image *image) {
if (image->is_half_float) {
uint16_t h[2];
float f[2];
f[0] = 0;
f[1] = 1.0;
singles2halfp(&h[0], &f[0], 2);
int n = image->extended_width * image->height;
for (int i = 0; i < n; i++) {
*(uint64_t *)&image->pixels[i * 2] = pack_rgba16(h[0], h[0], h[0], h[1]);
}
return;
}
int n = image->extended_width * image->height;
if (image->bits_per_component == 16)
for (int i = 0; i < n; i++)
image->pixels[i] = 0;
else
if (image->is_signed) {
// Signed 8-bit components.
uint32_t pixel = pack_r((uint8_t)(char)- 127);
if (image->nu_components == 2)
pixel |= pack_g((uint8_t)(char)- 127);
for (int i = 0; i < n; i++)
image->pixels[i] = pixel;
}
else
for (int i = 0; i < n; i++)
image->pixels[i] = pack_rgb_alpha_0xff(0, 0, 0);
}
// Convert a texture to an image. The image's pixels will be allocated. The image will have extended_width and
// extended_height to block boundaries, but the width and height are that of the original texture.
void convert_texture_to_image(Texture *texture, Image *image) {
if (texture->type & TEXTURE_TYPE_ASTC_BIT) {
convert_astc_texture_to_image(texture, image);
return;
}
int n = (texture->extended_height / texture->block_height) * (texture->extended_width / texture->block_width);
image->width = texture->width;
image->height = texture->height;
image->extended_width = texture->extended_width;
image->extended_height = texture->extended_height;
int bpp = 4;
if (texture->type & TEXTURE_TYPE_HALF_FLOAT_BIT)
bpp = 8; // 64-bit pixels
image->pixels = (unsigned int *)malloc(n * texture->block_width * texture->block_height * bpp);
image->alpha_bits = 0;
if (texture->type & TEXTURE_TYPE_ALPHA_BIT) {
if (texture->type & TEXTURE_TYPE_HALF_FLOAT_BIT)
image->alpha_bits = 16;
else
image->alpha_bits = 8;
}
image->nu_components = texture->info->nu_components;
image->bits_per_component = 8;
if (texture->type & TEXTURE_TYPE_16_BIT_COMPONENTS_BIT)
image->bits_per_component = 16;
image->is_half_float = 0;
if (texture->type & TEXTURE_TYPE_HALF_FLOAT_BIT) {
image->is_half_float = 1;
}
if (texture->type & TEXTURE_TYPE_SIGNED_BIT)
image->is_signed = 1;
else
image->is_signed = 0;
image->srgb = 0;
unsigned int *buffer = (unsigned int *)alloca(sizeof(unsigned int) * texture->block_width * texture->block_height * (bpp / 4));
int flags = 0;
if (texture->type & TEXTURE_TYPE_ETC_BIT) {
flags = ETC2_MODE_ALLOWED_ALL;
if (option_allowed_modes_etc2 != - 1)
flags = option_allowed_modes_etc2;
}
else if (texture->type == TEXTURE_TYPE_BPTC)
flags = BPTC_MODE_ALLOWED_ALL;
else if (texture->type == TEXTURE_TYPE_BPTC_FLOAT || texture->type == TEXTURE_TYPE_BPTC_SIGNED_FLOAT)
flags = BPTC_FLOAT_MODE_ALLOWED_ALL;
for (int y = 0; y < texture->extended_height; y += texture->block_height)
for (int x = 0; x < texture->extended_width; x += texture->block_width) {
unsigned char *bitstring = (unsigned char *)&texture->pixels[
((y / texture->block_height) * (texture->extended_width / texture->block_width) +
(x / texture->block_width)) * (texture->info->internal_bits_per_block / 32)];
int r = texture->decoding_function(bitstring, buffer, flags);
if (r == 0)
// If the block mode is not allowed, display a black block.
memset(buffer, 0, 16 * bpp);
for (int i = 0; i < texture->block_height; i++)
memcpy(&image->pixels[((y + i) * image->extended_width + x) * (bpp / 4)],
&buffer[i * texture->block_width * (bpp / 4)], texture->block_width * bpp);
}
if (image->alpha_bits >= 8)
check_1bit_alpha(image);
}
// Pad the borders of the image (the area beyond width x height to extended_width x extended_heigth).
void pad_image_borders(Image *image) {
int bpp = 4;
if (image->is_half_float)
bpp = 8;
// Pad the borders by extending the nearest pixel.
for (int y = 0; y < image->height; y++)
for (int x = image->width; x < image->extended_width; x++)
image->pixels[(y * image->extended_width + x) * (bpp / 4)] =
image->pixels[(y * image->extended_width + image->width - 1) * (bpp / 4)];
for (int y = image->height; y < image->extended_height; y++)
for (int x = 0; x < image->extended_width; x++)
image->pixels[(y * image->extended_width + x)* (bpp / 4)] = image->pixels[
((image->height - 1) * image->extended_width + x) * (bpp / 4)];
}
// Check whether the image contains only 0x00 (transparent) or 0xFF (opaque) alpha. If so, set the
// number of alpha bits to 1.
void check_1bit_alpha(Image *image) {
if (image->is_half_float) {
uint16_t hf[2];
float f[2];
f[0] = 0;
f[1] = 1.0;
singles2halfp(&hf[0], &f[0], 2);
for (int y = 0; y < image->height; y++)
for (int x = 0; x < image->width; x++) {
uint64_t pixel = *(uint64_t *)&image->pixels[(y * image->extended_width + x) * 2];
uint16_t a = pixel64_get_a16(pixel);
if (a != hf[0] && a != hf[1])
return;
}
image->alpha_bits = 1;
return;
}
for (int y = 0; y < image->height; y++)
for (int x = 0; x < image->width; x++) {
unsigned int pixel = image->pixels[y * image->extended_width + x];
int a = pixel_get_a(pixel);
if (a != 0 && a != 0xFF)
return;
}
image->alpha_bits = 1;
}
// Flip an image vertically.
void flip_image_vertical(Image *image) {
int bpp = 4;
if (image->is_half_float)
bpp = 8;
unsigned int *pixels = (unsigned int *)malloc(image->width * image->height * bpp);
for (int y = 0; y < image->height; y++)
memcpy(&pixels[y * image->width * (bpp / 4)], &image->pixels[
(image->height - 1 - y) * image->extended_width * (bpp / 4)], image->width * bpp);
for (int y = 0; y < image->height; y++)
memcpy(&image->pixels[y * image->extended_width * (bpp /4)], &pixels[y * image->width * (bpp / 4)],
image->width * bpp);
free(pixels);
pad_image_borders(image);
}
// RGB to and from sRGB conversion.
static int component_srgb_to_rgb(int c) {
double cs = (double)c / 255.0;
double cl;
if (cs <= 0.04045)
cl = cs / 12.92;
else
cl = pow((cs + 0.055) / 1.055, 2.4);
return floor(255.0 * cl + 0.5);
}
void convert_image_from_srgb_to_rgb(Image *source_image, Image *dest_image) {
dest_image->width = source_image->width;
dest_image->height = source_image->height;
dest_image->extended_width = source_image->extended_width;
dest_image->extended_height = source_image->extended_height;
dest_image->alpha_bits = source_image->alpha_bits;
dest_image->nu_components = source_image->nu_components;
dest_image->bits_per_component = source_image->bits_per_component;
dest_image->pixels = (unsigned int *)malloc(dest_image->extended_width * dest_image->extended_height * 4);
dest_image->srgb = 0;
dest_image->is_half_float = 0;
dest_image->is_signed = 0;
if (source_image->is_half_float) {
printf("Error -- cannot convert half-float image from sRGB to RGB.\n");
exit(1);
}
for (int y = 0; y < source_image->height; y++)
for (int x = 0; x < source_image->width; x++) {
unsigned int pixel = source_image->pixels[y * source_image->extended_width + x];
int r = pixel_get_r(pixel);
int g = pixel_get_g(pixel);
int b = pixel_get_b(pixel);
int a = pixel_get_a(pixel);
r = component_srgb_to_rgb(r);
g = component_srgb_to_rgb(g);
b = component_srgb_to_rgb(b);
dest_image->pixels[y * dest_image->extended_width + x] = pack_rgba(r, g, b, a);
}
}
static int component_rgb_to_srgb(int c) {
double cl = (double)c / 255.0;
double cs;
if (cl < 0.0031308) {
cs = 12.92 * cl;
} else {
cs = 1.055 * pow(cl, 0.41666) - 0.055;
}
return floor(255.0 * cs + 0.5);
}
void convert_image_from_rgb_to_srgb(Image *source_image, Image *dest_image) {
dest_image->width = source_image->width;
dest_image->height = source_image->height;
dest_image->extended_width = source_image->extended_width;
dest_image->extended_height = source_image->extended_height;
dest_image->alpha_bits = source_image->alpha_bits;
dest_image->nu_components = source_image->nu_components;
dest_image->bits_per_component = source_image->bits_per_component;
dest_image->pixels = (unsigned int *)malloc(dest_image->extended_width * dest_image->extended_height * 4);
dest_image->srgb = 1;
dest_image->is_half_float = 0;
dest_image->is_signed = 0;
if (source_image->is_half_float) {
printf("Error -- cannot convert half-float image from RGB to sRGB.\n");
exit(1);
}
for (int y = 0; y < source_image->height; y++)
for (int x = 0; x < source_image->width; x++) {
unsigned int pixel = source_image->pixels[y * source_image->extended_width + x];
int r = pixel_get_r(pixel);
int g = pixel_get_g(pixel);
int b = pixel_get_b(pixel);
int a = pixel_get_a(pixel);
r = component_rgb_to_srgb(r);
g = component_rgb_to_srgb(g);
b = component_rgb_to_srgb(b);
dest_image->pixels[y * dest_image->extended_width + x] = pack_rgba(r, g, b, a);
}
}
void copy_image_to_uncompressed_texture(Image *image, int texture_type, Texture *texture) {
texture->info = match_texture_type(texture_type);
texture->width = image->width;
texture->height = image->height;
texture->extended_width = image->width;
texture->extended_height = image->height;
texture->type = texture_type;
texture->block_width = 1;
texture->block_height = 1;
texture->bits_per_block = texture->info->bits_per_block;
set_texture_decoding_function(texture, NULL);
if (image->bits_per_component == 8 && !(image->is_signed) && (texture_type & TEXTURE_TYPE_HALF_FLOAT_BIT)) {
// Convert image from 8-bit unsigned format to normalized half-float texture.
Image cloned_image;
clone_image(image, &cloned_image);
convert_image_to_half_float(&cloned_image);
copy_image_to_uncompressed_texture(&cloned_image, texture_type, texture);
destroy_image(&cloned_image);
return;
}
if (image->is_half_float && (texture_type & TEXTURE_TYPE_HALF_FLOAT_BIT)) {
texture->pixels = (unsigned int *)malloc(image->height * image->width * 8);
for (int y = 0; y < image->height; y++)
memcpy(&texture->pixels[y * texture->width * 2], &image->pixels[y * image->extended_width * 2],
image->width * 8);
return;
}
if (image->is_half_float && !(texture_type & TEXTURE_TYPE_HALF_FLOAT_BIT) && !(texture_type &
TEXTURE_TYPE_16_BIT_COMPONENTS_BIT)) {
// Convert image from normalized half-float format to 8 bits per component, signed or unsigned
// texture format.
Image cloned_image;
clone_image(image, &cloned_image);
convert_image_from_half_float(&cloned_image, 0, 1.0, 1.0);
// Convert to signed if necessary.
if (texture_type & TEXTURE_TYPE_SIGNED_BIT)
convert_image_to_8_bit_format(&cloned_image, cloned_image.nu_components, 1);
copy_image_to_uncompressed_texture(&cloned_image, texture_type, texture);
destroy_image(&cloned_image);
return;
}
if (image->is_half_float) {
printf("Error -- no support for converting half-float image to non-half-float texture format.\n");
exit(1);
}
if (image->bits_per_component == 16) {
if (!(texture_type & TEXTURE_TYPE_16_BIT_COMPONENTS_BIT)) {
// Convert image from signed or unsigned 16-bit format to texture with signed or
// unsigned 8-bit format.
Image cloned_image;
clone_image(image, &cloned_image);
if (!(texture_type & TEXTURE_TYPE_SIGNED_BIT))
// Convert to unsigned 8-bit format.
convert_image_to_8_bit_format(&cloned_image, cloned_image.nu_components, 0);
else
// Convert to signed 8-bit format.
convert_image_to_8_bit_format(&cloned_image, cloned_image.nu_components, 1);
copy_image_to_uncompressed_texture(&cloned_image, texture_type, texture);
destroy_image(&cloned_image);
return;
}
else
if ((texture_type & TEXTURE_TYPE_16_BIT_COMPONENTS_BIT) && !(texture_type & TEXTURE_TYPE_HALF_FLOAT_BIT))
{
// Convert image with signed or unsigned 16-bit format to texture with signed or
// unsigned 16-bit format.
if ((image->is_signed && (texture_type & TEXTURE_TYPE_SIGNED_BIT)) ||
(!image->is_signed && !(texture_type & TEXTURE_TYPE_SIGNED_BIT)))
// No conversion necessary.
goto copy;
Image cloned_image;
clone_image(image, &cloned_image);
if (!(texture_type & TEXTURE_TYPE_SIGNED_BIT))
// Convert to unsigned 8-bit format.
convert_image_to_16_bit_format(&cloned_image, cloned_image.nu_components, 0);
else
// Convert to signed 8-bit format.
convert_image_to_16_bit_format(&cloned_image, cloned_image.nu_components, 1);
copy_image_to_uncompressed_texture(&cloned_image, texture_type, texture);
destroy_image(&cloned_image);
return;
}
else
if (texture_type & TEXTURE_TYPE_HALF_FLOAT_BIT) {
if (image->is_signed) {
printf("Error -- no support for converting 16-bit image to half-float texture format.\n");
exit(1);
}
Image cloned_image;
clone_image(image, &cloned_image);
convert_image_to_half_float(&cloned_image);
copy_image_to_uncompressed_texture(&cloned_image, texture_type, texture);
destroy_image(&cloned_image);
return;
}
}
else if (image->bits_per_component == 8) {
if (!(texture_type & TEXTURE_TYPE_16_BIT_COMPONENTS_BIT) && (texture_type & TEXTURE_TYPE_SIGNED_BIT)) {
// Convert image from signed or unsigned 8-bit format to texture with signed 8-bit format.
if (image->is_signed)
// No conversion necessary.
goto copy;
Image cloned_image;
clone_image(image, &cloned_image);
// Convert to signed 8-bit format.
convert_image_to_8_bit_format(&cloned_image, cloned_image.nu_components, 1);
copy_image_to_uncompressed_texture(&cloned_image, texture_type, texture);
destroy_image(&cloned_image);
return;
}
else if (!(texture_type & TEXTURE_TYPE_16_BIT_COMPONENTS_BIT) && !(texture_type & TEXTURE_TYPE_SIGNED_BIT)
&& image->nu_components > texture->info->nu_components) {
// The uncompressed texture format has less components than the source image.
Image cloned_image;
clone_image(image, &cloned_image);
// Convert to unsigned 8-bit format, losing any extra components.
convert_image_to_8_bit_format(&cloned_image, cloned_image.nu_components, 0);
copy_image_to_uncompressed_texture(&cloned_image, texture_type, texture);
destroy_image(&cloned_image);
return;
}
else
if ((texture_type & TEXTURE_TYPE_16_BIT_COMPONENTS_BIT) && !(texture_type & TEXTURE_TYPE_HALF_FLOAT_BIT))
{
// Convert image with signed or unsigned 8-bit format to texture with signed or unsigned
// 16-bit format.
Image cloned_image;
clone_image(image, &cloned_image);
if (!(texture_type & TEXTURE_TYPE_SIGNED_BIT))
// Convert to unsigned 8-bit format.
convert_image_to_16_bit_format(&cloned_image, cloned_image.nu_components, 0);
else
// Convert to signed 8-bit format.
convert_image_to_16_bit_format(&cloned_image, cloned_image.nu_components, 1);
copy_image_to_uncompressed_texture(&cloned_image, texture_type, texture);
destroy_image(&cloned_image);
return;
}
else
if (texture_type & TEXTURE_TYPE_HALF_FLOAT_BIT) {
printf("Error -- no support for converting signed 8-bit image to half-float texture format.\n");
}
}
copy :
texture->pixels = (unsigned int *)malloc(image->height * image->width * 4);
if (texture_type == TEXTURE_TYPE_UNCOMPRESSED_ARGB8) {
// Reverse component order.
for (int y = 0; y < image->height; y++)
for (int x = 0; x < image->width; x++) {
uint32_t pixel = image->pixels[y * image->extended_width + x];
texture->pixels[y * texture->extended_width + x] = pack_rgba(pixel_get_a(pixel),
pixel_get_r(pixel), pixel_get_g(pixel), pixel_get_b(pixel));
}
return;
}
if (image->bits_per_component == 8 && image->nu_components >= 3 && (texture->info->red_mask != 0xFF ||
texture->info->green_mask != 0xFF00 || texture->info->blue_mask != 0xFF0000)) {
printf("Error -- unable to convert image to texture with unconventional red, green or blue masks.\n");
exit(1);
}
if (texture->info->internal_bits_per_block != 32) {
printf("Error -- unable to convert image to uncompressed texture with internal non-32-bit packed pixel size.\n");
exit(1);
}
for (int y = 0; y < image->height; y++)
memcpy(&texture->pixels[y * texture->width], &image->pixels[y * image->extended_width],
image->width * 4);
}
void convert_image_to_half_float(Image *image) {
if (!option_quiet)
printf("Converting image to half-float format.\n");
Image new_image;
new_image = *image; // Copy fields.
new_image.is_half_float = 1;
new_image.bits_per_component = 16;
new_image.pixels = (unsigned int *)malloc(image->extended_width * image->extended_height * 8);
for (int y = 0; y < image->height; y++)
for (int x = 0; x < image->width; x++) {
float f[4];
if (image->bits_per_component == 16) {
f[0] = ((double)pixel_get_r16(image->pixels[y * image->extended_width + x])) / 65535.0;
f[1] = f[2] = f[3] = 0;
if (image->nu_components >= 2)
f[1] = ((double)pixel_get_g16(image->pixels[y * image->extended_width + x]))
/ 65535.0;
}
else {
f[0] = ((double)pixel_get_r(image->pixels[y * image->extended_width + x])) / 255.0;
f[1] = f[2] = f[3] = 0;
if (image->nu_components >= 2) {
f[1] = ((double)pixel_get_g(image->pixels[y * image->extended_width + x]))
/ 255.0;
if (image->nu_components >= 3) {
f[2] = ((double)pixel_get_b(image->pixels[y * image->extended_width + x]))
/ 255.0;
if (image->nu_components == 4)
f[3] = ((double)pixel_get_a(image->pixels[
y * image->extended_width + x])) / 255.0;
else
f[3] = 1.0;
}
}
}
singles2halfp(&new_image.pixels[(y * new_image.extended_width + x) * 2], &f[0], 4);
}
free(image->pixels);
*image = new_image;
}
static float clamp_0to1(float x) {
if (x < 0)
return 0;
if (x > 1.0)
return 1.0;
return x;
}
void calculate_image_dynamic_range(Image *image, float *range_min_out, float *range_max_out) {
calculate_half_float_table();
float range_min = FLT_MAX;
float range_max = - FLT_MAX;
for (int y = 0; y < image->height; y++)
for (int x = 0; x < image->width; x++) {
uint16_t *pix = (uint16_t *)&image->pixels[(y * image->extended_width + x) * 2];
float f[4];
f[0] = half_float_table[pix[0]];
f[1] = half_float_table[pix[1]];
f[2] = half_float_table[pix[2]];
f[3] = half_float_table[pix[3]];
for (int i = 0; i < 3; i++) {
if (f[i] < range_min)
range_min = f[i];
if (f[i] > range_max)
range_max = f[i];
}
if (image->alpha_bits > 0) {
if (f[3] < range_min)
range_min = f[3];
if (f[3] > range_max)
range_max = f[3];
}
}
*range_min_out = range_min;
*range_max_out = range_max;
}
void convert_image_from_half_float(Image *image, float _range_min, float _range_max, float gamma) {
if (!option_quiet)
printf("Converting image from half-float format to regular format.\n");
Image new_image;
new_image = *image; // Copy fields.
new_image.is_half_float = 0;
new_image.bits_per_component = 8;
new_image.pixels = (unsigned int *)malloc(image->extended_width * image->extended_height * 4);
if (image->alpha_bits == 8)
new_image.alpha_bits = 16;
float range_min, range_max;
calculate_half_float_table();
if (gamma >= 0.99 && gamma <= 1.01) {
range_min = _range_min;
range_max = _range_max;
}
else
if (gamma >= 2.19 && gamma <= 2.21) {
calculate_gamma_corrected_half_float_table();
if (_range_min < 0)
range_min = - powf(- _range_min, 1 / 2.2);
else
range_min = powf(_range_min, 1 / 2.2);
if (_range_max < 0)
range_max = - powf(- _range_max, 1 / 2.2);
else
range_max = powf(_range_max, 1 / 2.2);
}
else {
printf("Error -- unsupported gamma value.\n");
exit(1);
}
for (int y = 0; y < image->height; y++)
for (int x = 0; x < image->width; x++) {
uint16_t *pix = (uint16_t *)&image->pixels[(y * image->extended_width + x) * 2];
float f[4];
if (gamma == 1.0) {
f[0] = half_float_table[pix[0]];
f[1] = half_float_table[pix[1]];
f[2] = half_float_table[pix[2]];
f[3] = half_float_table[pix[3]];
if (image->nu_components < 2) {
f[1] = 0;
if (image->nu_components < 3)
f[2] = 0;
}
}
else {
f[0] = gamma_corrected_half_float_table[pix[0]];
f[1] = gamma_corrected_half_float_table[pix[1]];
f[2] = gamma_corrected_half_float_table[pix[2]];
f[3] = half_float_table[pix[3]];
}
int r = floor(clamp_0to1((f[0] - range_min) / (range_max - range_min)) * 255 + 0.5);
int g = floor(clamp_0to1((f[1] - range_min) / (range_max - range_min)) * 255 + 0.5);
int b = floor(clamp_0to1((f[2] - range_min) / (range_max - range_min)) * 255 + 0.5);
if (image->alpha_bits > 0) {
// Alpha is assumed to be linear value in the range 0 to 1.0.
int a = floor(clamp_0to1(f[3]) * 255 + 0.5);
new_image.pixels[y * new_image.extended_width + x] = pack_rgba(r, g, b, a);
}
else
new_image.pixels[y * new_image.extended_width + x] = pack_rgb_alpha_0xff(r, g, b);
}
free(image->pixels);
*image = new_image;
}
void extend_half_float_image_to_rgb(Image *image) {
for (int y = 0; y < image->height; y++)
for (int x = 0; x < image->width; x++) {
uint64_t pixel64 = *(uint64_t *)&image->pixels[(y * image->extended_width + x) * 2];
uint16_t h[1];
float f[1];
f[0] = 0;
singles2halfp(&h[0], &f[0], 1);
int r = pixel64_get_r16(pixel64);
int g = pixel64_get_g16(pixel64);
int b = pixel64_get_b16(pixel64);
if (image->nu_components < 2)
g = h[0];
if (image->nu_components < 3)
b = h[0];
*(uint64_t *)&image->pixels[(y * image->extended_width + x) * 2] = pack_rgb16(r, g, b);
}
image->nu_components = 3;
}
void print_image_info(Image *image) {
// printf("Image pixels: 0x%016lX\n", image->pixels);
printf("Image size: %d x %d\n", image->width, image->height);
printf("Image extended size: %d x %d\n", image->extended_width, image->extended_height);
printf("Image alpha bits: %d\n", image->alpha_bits);
printf("Image number of components: %d\n", image->nu_components);
printf("Image bits per component: %d\n", image->bits_per_component);
printf("Components are signed: %d\n", image->is_signed);
printf("Image is srgb: %d\n", image->srgb);
printf("Image is half-float: %d\n", image->is_half_float);
}