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godot/core/image.h
Rémi Verschelde d8223ffa75 Welcome in 2017, dear changelog reader! 
That year should bring the long-awaited OpenGL ES 3.0 compatible renderer
with state-of-the-art rendering techniques tuned to work as low as middle
end handheld devices - without compromising with the possibilities given
for higher end desktop games of course. Great times ahead for the Godot
community and the gamers that will play our games!

(cherry picked from commit c7bc44d5ad)
2017-01-12 19:15:30 +01:00

369 lines
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/*************************************************************************/
/* image.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef IMAGE_H
#define IMAGE_H
#include "dvector.h"
#include "color.h"
#include "math_2d.h"
/**
* @author Juan Linietsky <reduzio@gmail.com>
*
* Image storage class. This is used to store an image in user memory, as well as
* providing some basic methods for image manipulation.
* Images can be loaded from a file, or registered into the Render object as textures.
*/
class Image;
typedef Error (*SavePNGFunc)(const String &p_path, Image& p_img);
class Image {
enum {
MAX_WIDTH=16384, // force a limit somehow
MAX_HEIGHT=16384// force a limit somehow
};
public:
static SavePNGFunc save_png_func;
enum Format {
FORMAT_GRAYSCALE, ///< one byte per pixel, 0-255
FORMAT_INTENSITY, ///< one byte per pixel, 0-255
FORMAT_GRAYSCALE_ALPHA, ///< two bytes per pixel, 0-255. alpha 0-255
FORMAT_RGB, ///< one byte R, one byte G, one byte B
FORMAT_RGBA, ///< one byte R, one byte G, one byte B, one byte A
FORMAT_INDEXED, ///< index byte 0-256, and after image end, 256*3 bytes of palette
FORMAT_INDEXED_ALPHA, ///< index byte 0-256, and after image end, 256*4 bytes of palette (alpha)
FORMAT_YUV_422,
FORMAT_YUV_444,
FORMAT_BC1, // DXT1
FORMAT_BC2, // DXT3
FORMAT_BC3, // DXT5
FORMAT_BC4, // ATI1
FORMAT_BC5, // ATI2
FORMAT_PVRTC2,
FORMAT_PVRTC2_ALPHA,
FORMAT_PVRTC4,
FORMAT_PVRTC4_ALPHA,
FORMAT_ETC, // regular ETC, no transparency
FORMAT_ATC,
FORMAT_ATC_ALPHA_EXPLICIT,
FORMAT_ATC_ALPHA_INTERPOLATED,
/*FORMAT_ETC2_R, for the future..
FORMAT_ETC2_RG,
FORMAT_ETC2_RGB,
FORMAT_ETC2_RGBA1,
FORMAT_ETC2_RGBA,*/
FORMAT_CUSTOM,
FORMAT_MAX
};
static const char* format_names[FORMAT_MAX];
enum Interpolation {
INTERPOLATE_NEAREST,
INTERPOLATE_BILINEAR,
INTERPOLATE_CUBIC,
/* INTERPOLATE GAUSS */
};
static Image (*_png_mem_loader_func)(const uint8_t* p_png,int p_size);
static Image (*_jpg_mem_loader_func)(const uint8_t* p_png,int p_size);
static void (*_image_compress_bc_func)(Image *);
static void (*_image_compress_pvrtc2_func)(Image *);
static void (*_image_compress_pvrtc4_func)(Image *);
static void (*_image_compress_etc_func)(Image *);
static void (*_image_decompress_pvrtc)(Image *);
static void (*_image_decompress_bc)(Image *);
static void (*_image_decompress_etc)(Image *);
Error _decompress_bc();
static DVector<uint8_t> (*lossy_packer)(const Image& p_image,float p_quality);
static Image (*lossy_unpacker)(const DVector<uint8_t>& p_buffer);
static DVector<uint8_t> (*lossless_packer)(const Image& p_image);
static Image (*lossless_unpacker)(const DVector<uint8_t>& p_buffer);
private:
//internal byte based color
struct BColor {
union {
uint8_t col[4];
struct {
uint8_t r,g,b,a;
};
};
bool operator==(const BColor& p_color) const { for(int i=0;i<4;i++) {if (col[i]!=p_color.col[i]) return false; } return true; }
_FORCE_INLINE_ uint8_t gray() const { return (uint16_t(col[0])+uint16_t(col[1])+uint16_t(col[2]))/3; }
_FORCE_INLINE_ BColor() {}
BColor(uint8_t p_r,uint8_t p_g,uint8_t p_b,uint8_t p_a=255) { col[0]=p_r; col[1]=p_g; col[2]=p_b; col[3]=p_a; }
};
//median cut classes
struct BColorPos {
uint32_t index;
BColor color;
struct SortR {
bool operator()(const BColorPos& ca, const BColorPos& cb) const { return ca.color.r < cb.color.r; }
};
struct SortG {
bool operator()(const BColorPos& ca, const BColorPos& cb) const { return ca.color.g < cb.color.g; }
};
struct SortB {
bool operator()(const BColorPos& ca, const BColorPos& cb) const { return ca.color.b < cb.color.b; }
};
struct SortA {
bool operator()(const BColorPos& ca, const BColorPos& cb) const { return ca.color.a < cb.color.a; }
};
};
struct SPTree {
bool leaf;
uint8_t split_plane;
uint8_t split_value;
union {
int left;
int color;
};
int right;
SPTree() { leaf=true; left=-1; right=-1;}
};
struct MCBlock {
BColorPos min_color,max_color;
BColorPos *colors;
int sp_idx;
int color_count;
int get_longest_axis_index() const;
int get_longest_axis_length() const;
bool operator<(const MCBlock& p_block) const;
void shrink();
MCBlock();
MCBlock(BColorPos *p_colors,int p_color_count);
};
Format format;
DVector<uint8_t> data;
int width,height,mipmaps;
_FORCE_INLINE_ BColor _get_pixel(int p_x,int p_y,const unsigned char *p_data,int p_data_size) const;
_FORCE_INLINE_ BColor _get_pixelw(int p_x,int p_y,int p_width,const unsigned char *p_data,int p_data_size) const;
_FORCE_INLINE_ void _put_pixelw(int p_x,int p_y, int p_width, const BColor& p_color, unsigned char *p_data);
_FORCE_INLINE_ void _put_pixel(int p_x,int p_y, const BColor& p_color, unsigned char *p_data);
_FORCE_INLINE_ void _get_mipmap_offset_and_size(int p_mipmap,int &r_offset, int &r_width, int &r_height) const; //get where the mipmap begins in data
_FORCE_INLINE_ static void _get_format_min_data_size(Format p_format,int &r_w, int &r_h);
static int _get_dst_image_size(int p_width, int p_height, Format p_format,int &r_mipmaps,int p_mipmaps=-1);
bool _can_modify(Format p_format) const;
public:
int get_width() const; ///< Get image width
int get_height() const; ///< Get image height
int get_mipmaps() const;
/**
* Get a pixel from the image. for grayscale or indexed formats, use Color::gray to obtain the actual
* value.
*/
Color get_pixel(int p_x,int p_y,int p_mipmap=0) const;
/**
* Set a pixel into the image. for grayscale or indexed formats, a suitable Color constructor.
*/
void put_pixel(int p_x,int p_y, const Color& p_color,int p_mipmap=0); /* alpha and index are averaged */
/**
* Convert the image to another format, as close as it can be done.
*/
void convert( Format p_new_format );
Image converted(int p_new_format) {
ERR_FAIL_INDEX_V(p_new_format, FORMAT_MAX, Image());
Image ret = *this;
ret.convert((Format)p_new_format);
return ret;
};
/**
* Get the current image format.
*/
Format get_format() const;
int get_mipmap_offset(int p_mipmap) const; //get where the mipmap begins in data
void get_mipmap_offset_and_size(int p_mipmap,int &r_ofs, int &r_size) const; //get where the mipmap begins in data
void get_mipmap_offset_size_and_dimensions(int p_mipmap,int &r_ofs, int &r_size,int &w, int& h) const; //get where the mipmap begins in data
/**
* Resize the image, using the prefered interpolation method.
* Indexed-Color images always use INTERPOLATE_NEAREST.
*/
void resize_to_po2(bool p_square=false);
void resize( int p_width, int p_height, Interpolation p_interpolation=INTERPOLATE_BILINEAR );
Image resized( int p_width, int p_height, int p_interpolation=INTERPOLATE_BILINEAR );
void shrink_x2();
void expand_x2_hq2x();
/**
* Crop the image to a specific size, if larger, then the image is filled by black
*/
void crop( int p_width, int p_height );
void flip_x();
void flip_y();
/**
* Generate a mipmap to an image (creates an image 1/4 the size, with averaging of 4->1)
*/
Error generate_mipmaps(int p_amount=-1,bool p_keep_existing=false);
void clear_mipmaps();
/**
* Generate a normal map from a grayscale image
*/
void make_normalmap(float p_height_scale=1.0);
/**
* Create a new image of a given size and format. Current image will be lost
*/
void create(int p_width, int p_height, bool p_use_mipmaps, Format p_format);
void create(int p_width, int p_height, int p_mipmaps, Format p_format, const DVector<uint8_t>& p_data);
void create( const char ** p_xpm );
/**
* returns true when the image is empty (0,0) in size
*/
bool empty() const;
DVector<uint8_t> get_data() const;
Error load(const String& p_path);
Error save_png(const String& p_path);
/**
* create an empty image
*/
Image();
/**
* create an empty image of a specific size and format
*/
Image(int p_width, int p_height, bool p_use_mipmaps, Format p_format);
/**
* import an image of a specific size and format from a pointer
*/
Image(int p_width, int p_height, int p_mipmaps, Format p_format, const DVector<uint8_t>& p_data);
enum AlphaMode {
ALPHA_NONE,
ALPHA_BIT,
ALPHA_BLEND
};
AlphaMode detect_alpha() const;
bool is_invisible() const;
void put_indexed_pixel(int p_x, int p_y, uint8_t p_idx,int p_mipmap=0);
uint8_t get_indexed_pixel(int p_x, int p_y,int p_mipmap=0) const;
void set_pallete(const DVector<uint8_t>& p_data);
static int get_format_pixel_size(Format p_format);
static int get_format_pixel_rshift(Format p_format);
static int get_format_pallete_size(Format p_format);
static int get_image_data_size(int p_width, int p_height, Format p_format,int p_mipmaps=0);
static int get_image_required_mipmaps(int p_width, int p_height, Format p_format);
bool operator==(const Image& p_image) const;
void quantize();
enum CompressMode {
COMPRESS_BC,
COMPRESS_PVRTC2,
COMPRESS_PVRTC4,
COMPRESS_ETC
};
Error compress(CompressMode p_mode=COMPRESS_BC);
Image compressed(int p_mode); /* from the Image::CompressMode enum */
Error decompress();
Image decompressed() const;
bool is_compressed() const;
void fix_alpha_edges();
void premultiply_alpha();
void srgb_to_linear();
void normalmap_to_xy();
void blit_rect(const Image& p_src, const Rect2& p_src_rect,const Point2& p_dest);
void brush_transfer(const Image& p_src, const Image& p_brush, const Point2& p_dest);
Image brushed(const Image& p_src, const Image& p_brush, const Point2& p_dest) const;
Rect2 get_used_rect() const;
Image get_rect(const Rect2& p_area) const;
static void set_compress_bc_func(void (*p_compress_func)(Image *));
static String get_format_name(Format p_format);
Image(const uint8_t* p_mem_png_jpg, int p_len=-1);
Image(const char **p_xpm);
~Image();
};
#endif
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