d6e30256ad
this is for extreme cases when running on devices with very low video memory, so you can still retain compatibility.
367 lines
12 KiB
C++
367 lines
12 KiB
C++
/*************************************************************************/
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/* image.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef IMAGE_H
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#define IMAGE_H
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#include "dvector.h"
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#include "color.h"
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#include "math_2d.h"
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/**
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* @author Juan Linietsky <reduzio@gmail.com>
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*
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* Image storage class. This is used to store an image in user memory, as well as
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* providing some basic methods for image manipulation.
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* Images can be loaded from a file, or registered into the Render object as textures.
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*/
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class Image;
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typedef Error (*SavePNGFunc)(const String &p_path, Image& p_img);
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class Image {
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enum {
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MAX_WIDTH=16384, // force a limit somehow
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MAX_HEIGHT=16384// force a limit somehow
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};
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public:
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static SavePNGFunc save_png_func;
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enum Format {
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FORMAT_GRAYSCALE, ///< one byte per pixel, 0-255
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FORMAT_INTENSITY, ///< one byte per pixel, 0-255
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FORMAT_GRAYSCALE_ALPHA, ///< two bytes per pixel, 0-255. alpha 0-255
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FORMAT_RGB, ///< one byte R, one byte G, one byte B
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FORMAT_RGBA, ///< one byte R, one byte G, one byte B, one byte A
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FORMAT_INDEXED, ///< index byte 0-256, and after image end, 256*3 bytes of palette
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FORMAT_INDEXED_ALPHA, ///< index byte 0-256, and after image end, 256*4 bytes of palette (alpha)
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FORMAT_YUV_422,
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FORMAT_YUV_444,
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FORMAT_BC1, // DXT1
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FORMAT_BC2, // DXT3
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FORMAT_BC3, // DXT5
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FORMAT_BC4, // ATI1
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FORMAT_BC5, // ATI2
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FORMAT_PVRTC2,
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FORMAT_PVRTC2_ALPHA,
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FORMAT_PVRTC4,
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FORMAT_PVRTC4_ALPHA,
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FORMAT_ETC, // regular ETC, no transparency
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FORMAT_ATC,
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FORMAT_ATC_ALPHA_EXPLICIT,
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FORMAT_ATC_ALPHA_INTERPOLATED,
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/*FORMAT_ETC2_R, for the future..
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FORMAT_ETC2_RG,
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FORMAT_ETC2_RGB,
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FORMAT_ETC2_RGBA1,
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FORMAT_ETC2_RGBA,*/
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FORMAT_CUSTOM,
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FORMAT_MAX
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};
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static const char* format_names[FORMAT_MAX];
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enum Interpolation {
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INTERPOLATE_NEAREST,
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INTERPOLATE_BILINEAR,
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INTERPOLATE_CUBIC,
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/* INTERPOLATE GAUSS */
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};
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static Image (*_png_mem_loader_func)(const uint8_t* p_png,int p_size);
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static void (*_image_compress_bc_func)(Image *);
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static void (*_image_compress_pvrtc2_func)(Image *);
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static void (*_image_compress_pvrtc4_func)(Image *);
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static void (*_image_compress_etc_func)(Image *);
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static void (*_image_decompress_pvrtc)(Image *);
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static void (*_image_decompress_bc)(Image *);
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static void (*_image_decompress_etc)(Image *);
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Error _decompress_bc();
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static DVector<uint8_t> (*lossy_packer)(const Image& p_image,float p_quality);
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static Image (*lossy_unpacker)(const DVector<uint8_t>& p_buffer);
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static DVector<uint8_t> (*lossless_packer)(const Image& p_image);
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static Image (*lossless_unpacker)(const DVector<uint8_t>& p_buffer);
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private:
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//internal byte based color
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struct BColor {
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union {
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uint8_t col[4];
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struct {
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uint8_t r,g,b,a;
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};
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};
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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; }
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_FORCE_INLINE_ uint8_t gray() const { return (uint16_t(col[0])+uint16_t(col[1])+uint16_t(col[2]))/3; }
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_FORCE_INLINE_ BColor() {}
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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; }
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};
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//median cut classes
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struct BColorPos {
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uint32_t index;
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BColor color;
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struct SortR {
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bool operator()(const BColorPos& ca, const BColorPos& cb) const { return ca.color.r < cb.color.r; }
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};
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struct SortG {
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bool operator()(const BColorPos& ca, const BColorPos& cb) const { return ca.color.g < cb.color.g; }
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};
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struct SortB {
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bool operator()(const BColorPos& ca, const BColorPos& cb) const { return ca.color.b < cb.color.b; }
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};
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struct SortA {
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bool operator()(const BColorPos& ca, const BColorPos& cb) const { return ca.color.a < cb.color.a; }
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};
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};
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struct SPTree {
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bool leaf;
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uint8_t split_plane;
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uint8_t split_value;
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union {
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int left;
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int color;
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};
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int right;
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SPTree() { leaf=true; left=-1; right=-1;}
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};
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struct MCBlock {
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BColorPos min_color,max_color;
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BColorPos *colors;
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int sp_idx;
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int color_count;
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int get_longest_axis_index() const;
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int get_longest_axis_length() const;
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bool operator<(const MCBlock& p_block) const;
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void shrink();
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MCBlock();
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MCBlock(BColorPos *p_colors,int p_color_count);
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};
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Format format;
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DVector<uint8_t> data;
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int width,height,mipmaps;
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_FORCE_INLINE_ BColor _get_pixel(int p_x,int p_y,const unsigned char *p_data,int p_data_size) const;
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_FORCE_INLINE_ BColor _get_pixelw(int p_x,int p_y,int p_width,const unsigned char *p_data,int p_data_size) const;
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_FORCE_INLINE_ void _put_pixelw(int p_x,int p_y, int p_width, const BColor& p_color, unsigned char *p_data);
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_FORCE_INLINE_ void _put_pixel(int p_x,int p_y, const BColor& p_color, unsigned char *p_data);
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_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
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_FORCE_INLINE_ static void _get_format_min_data_size(Format p_format,int &r_w, int &r_h);
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static int _get_dst_image_size(int p_width, int p_height, Format p_format,int &r_mipmaps,int p_mipmaps=-1);
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bool _can_modify(Format p_format) const;
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public:
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int get_width() const; ///< Get image width
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int get_height() const; ///< Get image height
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int get_mipmaps() const;
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/**
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* Get a pixel from the image. for grayscale or indexed formats, use Color::gray to obtain the actual
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* value.
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*/
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Color get_pixel(int p_x,int p_y,int p_mipmap=0) const;
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/**
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* Set a pixel into the image. for grayscale or indexed formats, a suitable Color constructor.
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*/
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void put_pixel(int p_x,int p_y, const Color& p_color,int p_mipmap=0); /* alpha and index are averaged */
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/**
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* Convert the image to another format, as close as it can be done.
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*/
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void convert( Format p_new_format );
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Image converted(int p_new_format) {
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ERR_FAIL_INDEX_V(p_new_format, FORMAT_MAX, Image());
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Image ret = *this;
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ret.convert((Format)p_new_format);
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return ret;
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};
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/**
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* Get the current image format.
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*/
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Format get_format() const;
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int get_mipmap_offset(int p_mipmap) const; //get where the mipmap begins in data
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void get_mipmap_offset_and_size(int p_mipmap,int &r_ofs, int &r_size) const; //get where the mipmap begins in data
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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
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/**
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* Resize the image, using the prefered interpolation method.
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* Indexed-Color images always use INTERPOLATE_NEAREST.
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*/
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void resize_to_po2(bool p_square=false);
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void resize( int p_width, int p_height, Interpolation p_interpolation=INTERPOLATE_BILINEAR );
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Image resized( int p_width, int p_height, int p_interpolation=INTERPOLATE_BILINEAR );
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void shrink_x2();
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/**
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* Crop the image to a specific size, if larger, then the image is filled by black
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*/
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void crop( int p_width, int p_height );
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void flip_x();
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void flip_y();
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/**
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* Generate a mipmap to an image (creates an image 1/4 the size, with averaging of 4->1)
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*/
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Error generate_mipmaps(int p_amount=-1,bool p_keep_existing=false);
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void clear_mipmaps();
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/**
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* Generate a normal map from a grayscale image
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*/
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void make_normalmap(float p_height_scale=1.0);
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/**
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* Create a new image of a given size and format. Current image will be lost
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*/
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void create(int p_width, int p_height, bool p_use_mipmaps, Format p_format);
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void create(int p_width, int p_height, int p_mipmaps, Format p_format, const DVector<uint8_t>& p_data);
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void create( const char ** p_xpm );
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/**
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* returns true when the image is empty (0,0) in size
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*/
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bool empty() const;
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DVector<uint8_t> get_data() const;
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Error load(const String& p_path);
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Error save_png(const String& p_path);
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/**
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* create an empty image
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*/
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Image();
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/**
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* create an empty image of a specific size and format
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*/
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Image(int p_width, int p_height, bool p_use_mipmaps, Format p_format);
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/**
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* import an image of a specific size and format from a pointer
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*/
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Image(int p_width, int p_height, int p_mipmaps, Format p_format, const DVector<uint8_t>& p_data);
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enum AlphaMode {
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ALPHA_NONE,
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ALPHA_BIT,
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ALPHA_BLEND
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};
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AlphaMode detect_alpha() const;
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bool is_invisible() const;
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void put_indexed_pixel(int p_x, int p_y, uint8_t p_idx,int p_mipmap=0);
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uint8_t get_indexed_pixel(int p_x, int p_y,int p_mipmap=0) const;
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void set_pallete(const DVector<uint8_t>& p_data);
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static int get_format_pixel_size(Format p_format);
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static int get_format_pixel_rshift(Format p_format);
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static int get_format_pallete_size(Format p_format);
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static int get_image_data_size(int p_width, int p_height, Format p_format,int p_mipmaps=0);
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static int get_image_required_mipmaps(int p_width, int p_height, Format p_format);
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bool operator==(const Image& p_image) const;
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void quantize();
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enum CompressMode {
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COMPRESS_BC,
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COMPRESS_PVRTC2,
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COMPRESS_PVRTC4,
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COMPRESS_ETC
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};
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Error compress(CompressMode p_mode=COMPRESS_BC);
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Image compressed(int p_mode); /* from the Image::CompressMode enum */
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Error decompress();
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Image decompressed() const;
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bool is_compressed() const;
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void fix_alpha_edges();
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void premultiply_alpha();
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void srgb_to_linear();
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void normalmap_to_xy();
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void blit_rect(const Image& p_src, const Rect2& p_src_rect,const Point2& p_dest);
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void brush_transfer(const Image& p_src, const Image& p_brush, const Point2& p_dest);
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Image brushed(const Image& p_src, const Image& p_brush, const Point2& p_dest) const;
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Rect2 get_used_rect() const;
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Image get_rect(const Rect2& p_area) const;
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static void set_compress_bc_func(void (*p_compress_func)(Image *));
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static String get_format_name(Format p_format);
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Image(const uint8_t* p_mem_png, int p_len=-1);
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Image(const char **p_xpm);
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~Image();
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};
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#endif
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