diff --git a/include/visual/drawing.hpp b/include/visual/drawing.hpp index 9bf864c5..ed427ca9 100644 --- a/include/visual/drawing.hpp +++ b/include/visual/drawing.hpp @@ -22,15 +22,6 @@ namespace fonts extern std::unique_ptr esp; extern std::unique_ptr menu; extern unsigned long surface_font; -} // namespace fonts - -namespace fonts -{ - -// FIXME add menu fonts -extern unsigned long ESP; -extern unsigned long MENU; -extern unsigned long MENU_BIG; void Update(); @@ -61,10 +52,41 @@ extern float fov; void Initialize(); +#if ENABLE_ENGINE_DRAWING +class Texture +{ +public: + explicit Texture(std::string path) : path{ path } + { + } + bool load(); + unsigned int get(); + ~Texture(); + unsigned int getWidth() + { + return m_width; + } + unsigned int getHeight() + { + return m_height; + } + +private: + std::string path; + unsigned int texture_id = 0; + unsigned char *data = nullptr; + bool init = false; + int m_width, m_height; +}; +#else +typedef glez::texture Texture; +#endif + void Line(float x1, float y1, float x2, float y2, rgba_t color, float thickness); void String(int x, int y, rgba_t rgba, const char *text); void Rectangle(float x, float y, float w, float h, rgba_t color); void RectangleOutlined(float x, float y, float w, float h, rgba_t color, float thickness); +void RectangleTextured(float x, float y, float w, float h, rgba_t color, Texture &texture, float tx, float ty, float tw, float th, float angle); void UpdateWTS(); bool WorldToScreen(const Vector &origin, Vector &screen); @@ -73,4 +95,5 @@ bool EntityCenterToScreen(CachedEntity *entity, Vector &out); void InitGL(); void BeginGL(); void EndGL(); + } // namespace draw diff --git a/include/visual/picopng.hpp b/include/visual/picopng.hpp new file mode 100644 index 00000000..14649296 --- /dev/null +++ b/include/visual/picopng.hpp @@ -0,0 +1,5 @@ +#pragma once +#include +int decodePNG(unsigned char *&out_image, int &image_width, int &image_height, + const unsigned char *in_png, size_t in_size, + bool convert_to_rgba32 = true); diff --git a/src/hacks/ESP.cpp b/src/hacks/ESP.cpp index 4963a6fb..0796e061 100644 --- a/src/hacks/ESP.cpp +++ b/src/hacks/ESP.cpp @@ -291,8 +291,8 @@ static void cm() } } -static glez::texture atlas{ DATA_PATH "/textures/atlas.png" }; -static glez::texture idspec{ DATA_PATH "/textures/idspec.png" }; +static draw::Texture atlas{ DATA_PATH "/textures/atlas.png" }; +static draw::Texture idspec{ DATA_PATH "/textures/idspec.png" }; Timer retry{}; void Init() @@ -342,7 +342,7 @@ void _FASTCALL emoji(CachedEntity *ent) if (g_IEngine->GetPlayerInfo(ent->m_IDX, &info)) steamID = info.friendsID; if (playerlist::AccessData(steamID).state == playerlist::k_EState::CAT) - glez::draw::rect_textured(head_scr.x - size / 2, head_scr.y - size / 2, size, size, glez::color::white, idspec, 2 * 64, 1 * 64, 64, 64, 0); + draw::RectangleTextured(head_scr.x - size / 2, head_scr.y - size / 2, size, size, glez::color::white, idspec, 2 * 64, 1 * 64, 64, 64, 0); for (int i = 0; i < 4; i++) { if (steamID == steamidarray[i]) @@ -353,12 +353,12 @@ void _FASTCALL emoji(CachedEntity *ent) ii++; i -= 4; } - glez::draw::rect_textured(head_scr.x - size / 2, head_scr.y - size / 2, size, size, glez::color::white, idspec, i * 64, ii * 64, 64, 64, 0); + draw::RectangleTextured(head_scr.x - size / 2, head_scr.y - size / 2, size, size, glez::color::white, idspec, i * 64, ii * 64, 64, 64, 0); hascall = true; } } if (!hascall) - glez::draw::rect_textured(head_scr.x - size / 2, head_scr.y - size / 2, size, size, colors::white, textures::atlas().texture, (3 + (v9mode ? 3 : (int) emoji_esp)) * 64, (v9mode ? 3 : 4) * 64, 64, 64, 0); + draw::RectangleTextured(head_scr.x - size / 2, head_scr.y - size / 2, size, size, colors::white, atlas, (3 + (v9mode ? 3 : (int) emoji_esp)) * 64, (v9mode ? 3 : 4) * 64, 64, 64, 0); } } } diff --git a/src/visual/CMakeLists.txt b/src/visual/CMakeLists.txt index 3795c4e0..b53363d6 100755 --- a/src/visual/CMakeLists.txt +++ b/src/visual/CMakeLists.txt @@ -5,8 +5,9 @@ target_sources(cathook PRIVATE "${CMAKE_CURRENT_LIST_DIR}/drawmgr.cpp" "${CMAKE_CURRENT_LIST_DIR}/EffectChams.cpp" "${CMAKE_CURRENT_LIST_DIR}/EffectGlow.cpp" - "${CMAKE_CURRENT_LIST_DIR}/EventLogging.cpp" + "${CMAKE_CURRENT_LIST_DIR}/EventLogging.cpp" "${CMAKE_CURRENT_LIST_DIR}/fidgetspinner.cpp" + "${CMAKE_CURRENT_LIST_DIR}/picopng.cpp" "${CMAKE_CURRENT_LIST_DIR}/SDLHooks.cpp") if(EnableGUI) diff --git a/src/visual/drawing.cpp b/src/visual/drawing.cpp index 4fc0487a..8b4fd324 100644 --- a/src/visual/drawing.cpp +++ b/src/visual/drawing.cpp @@ -12,7 +12,8 @@ #include #include #include -#include +#include "menu/GuiInterface.hpp" +#include "picopng.hpp" // String -> Wstring #include @@ -201,6 +202,50 @@ void RectangleOutlined(float x, float y, float w, float h, rgba_t color, float t Rectangle(x, y + h - 1, w, 1, color); } +void RectangleTextured(float x, float y, float w, float h, rgba_t color, Texture &texture, float tx, float ty, float tw, float th, float angle) +{ +#if !ENABLE_ENGINE_DRAWING + glez::draw::rect_textured(x, y, w, h, color, texture, tx, ty, tw, th, angle); +#else + color = color * 255.0f; + vgui::Vertex_t vertices[4]; + g_ISurface->DrawSetColor(color.r, color.g, color.b, color.a); + g_ISurface->DrawSetTexture(texture.get()); + + vertices[0].m_Position = { x, y }; + vertices[1].m_Position = { x, y + h }; + vertices[2].m_Position = { x + w, y + h }; + vertices[3].m_Position = { x + w, y }; + + if (angle != 0.0f) + { + float cx = x + float(w) / 2.0f; + float cy = y + float(h) / 2.0f; + + for (auto &v : vertices) + { + float ox = v.m_Position.x; + float oy = v.m_Position.y; + + v.m_Position.x = cx + cosf(angle) * (ox - cx) - sinf(angle) * (oy - cy); + v.m_Position.y = cy + sinf(angle) * (ox - cx) + cosf(angle) * (oy - cy); + } + } + + float s0 = float(tx) / texture.getWidth(); + float s1 = float(tx + tw) / texture.getWidth(); + float t0 = float(ty) / texture.getHeight(); + float t1 = float(ty + th) / texture.getHeight(); + + vertices[0].m_TexCoord = { s0, t0 }; + vertices[1].m_TexCoord = { s0, t1 }; + vertices[2].m_TexCoord = { s1, t1 }; + vertices[3].m_TexCoord = { s1, t0 }; + + g_ISurface->DrawTexturedPolygon(4, vertices); +#endif +} + bool EntityCenterToScreen(CachedEntity *entity, Vector &out) { Vector world, min, max; @@ -227,6 +272,53 @@ bool WorldToScreen(const Vector &origin, Vector &screen) return g_IVDebugOverlay->ScreenPosition(origin, screen) == 0; } +bool Texture::load() +{ + std::ifstream file(path.c_str(), std::ios::in | std::ios::binary | std::ios::ate); + + std::streamsize size = 0; + if (file.seekg(0, std::ios::end).good()) + size = file.tellg(); + if (file.seekg(0, std::ios::beg).good()) + size -= file.tellg(); + + if (size < 1) + return false; + + unsigned char *buffer = new unsigned char[(size_t) size + 1]; + file.read((char *) buffer, size); + file.close(); + int error = decodePNG(data, m_width, m_height, buffer, size); + + // if there's an error, display it and return false to indicate failure + if (error != 0) + { + logging::Info("Error loading texture, error code %i\n", error); + return false; + } + texture_id = g_ISurface->CreateNewTextureID(); + g_ISurface->DrawSetTextureRGBA(texture_id, data, m_width, m_height, false, false); + if (!g_ISurface->IsTextureIDValid(texture_id)) + return false; + init = true; + return true; +} + +Texture::~Texture() +{ + g_ISurface->DeleteTextureByID(texture_id); +} + +unsigned int Texture::get() +{ + if (!g_ISurface->IsTextureIDValid(texture_id)) + { + if (!load() || !g_ISurface->IsTextureIDValid(texture_id)) + throw std::runtime_error("Couldn't init texture!"); + } + return texture_id; +} + SDL_GLContext context = nullptr; void InitGL() diff --git a/src/visual/menu/menu/wm/WindowCloseButton.cpp b/src/visual/menu/menu/wm/WindowCloseButton.cpp index 7d532cb3..86564d1f 100644 --- a/src/visual/menu/menu/wm/WindowCloseButton.cpp +++ b/src/visual/menu/menu/wm/WindowCloseButton.cpp @@ -3,6 +3,7 @@ #include #include #include +#include "drawing.hpp" /* Created on 07.07.18. diff --git a/src/visual/picopng.cpp b/src/visual/picopng.cpp new file mode 100644 index 00000000..3b052531 --- /dev/null +++ b/src/visual/picopng.cpp @@ -0,0 +1,502 @@ +#include + +/* +decodePNG: The picoPNG function, decodes a PNG file buffer in memory, into a raw pixel buffer. +out_image: output parameter, this will contain the raw pixels after decoding. + By default the output is 32-bit RGBA color. +image_width: output_parameter, this will contain the width of the image in pixels. +image_height: output_parameter, this will contain the height of the image in pixels. +in_png: pointer to the buffer of the PNG file in memory. To get it from a file on + disk, load it and store it in a memory buffer yourself first. +in_size: size of the input PNG file in bytes. +convert_to_rgba32: optional parameter, true by default. + Set to true to get the output in RGBA 32-bit (8 bit per channel) color format + no matter what color type the original PNG image had. This gives predictable, + useable data from any random input PNG. + Set to false to do no color conversion at all. The result then has the same data + type as the PNG image, which can range from 1 bit to 64 bits per pixel. + Information about the color type or palette colors are not provided. You need + to know this information yourself to be able to use the data so this only + works for trusted PNG files. Use LodePNG instead of picoPNG if you need this information. +return: 0 if success, not 0 if some error occured. +*/ +int decodePNG(unsigned char* &out_image, int& image_width, int& image_height, const unsigned char* in_png, size_t in_size, bool convert_to_rgba32 = true) +{ + // picoPNG version 20101224 + // Copyright (c) 2005-2010 Lode Vandevenne + // + // This software is provided 'as-is', without any express or implied + // warranty. In no event will the authors be held liable for any damages + // arising from the use of this software. + // + // Permission is granted to anyone to use this software for any purpose, + // including commercial applications, and to alter it and redistribute it + // freely, subject to the following restrictions: + // + // 1. The origin of this software must not be misrepresented; you must not + // claim that you wrote the original software. If you use this software + // in a product, an acknowledgment in the product documentation would be + // appreciated but is not required. + // 2. Altered source versions must be plainly marked as such, and must not be + // misrepresented as being the original software. + // 3. This notice may not be removed or altered from any source distribution. + + // picoPNG is a PNG decoder in one C++ function of around 500 lines. Use picoPNG for + // programs that need only 1 .cpp file. Since it's a single function, it's very limited, + // it can convert a PNG to raw pixel data either converted to 32-bit RGBA color or + // with no color conversion at all. For anything more complex, another tiny library + // is available: LodePNG (lodepng.c(pp)), which is a single source and header file. + // Apologies for the compact code style, it's to make this tiny. + + static const unsigned long LENBASE[29] = {3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258}; + static const unsigned long LENEXTRA[29] = {0,0,0,0,0,0,0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0}; + static const unsigned long DISTBASE[30] = {1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577}; + static const unsigned long DISTEXTRA[30] = {0,0,0,0,1,1,2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13}; + static const unsigned long CLCL[19] = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; //code length code lengths + struct Zlib //nested functions for zlib decompression + { + static unsigned long readBitFromStream(size_t& bitp, const unsigned char* bits) { unsigned long result = (bits[bitp >> 3] >> (bitp & 0x7)) & 1; bitp++; return result;} + static unsigned long readBitsFromStream(size_t& bitp, const unsigned char* bits, size_t nbits) + { + unsigned long result = 0; + for(size_t i = 0; i < nbits; i++) result += (readBitFromStream(bitp, bits)) << i; + return result; + } + struct HuffmanTree + { + int makeFromLengths(const std::vector& bitlen, unsigned long maxbitlen) + { //make tree given the lengths + unsigned long numcodes = (unsigned long)(bitlen.size()), treepos = 0, nodefilled = 0; + std::vector tree1d(numcodes), blcount(maxbitlen + 1, 0), nextcode(maxbitlen + 1, 0); + for(unsigned long bits = 0; bits < numcodes; bits++) blcount[bitlen[bits]]++; //count number of instances of each code length + for(unsigned long bits = 1; bits <= maxbitlen; bits++) nextcode[bits] = (nextcode[bits - 1] + blcount[bits - 1]) << 1; + for(unsigned long n = 0; n < numcodes; n++) if(bitlen[n] != 0) tree1d[n] = nextcode[bitlen[n]]++; //generate all the codes + tree2d.clear(); tree2d.resize(numcodes * 2, 32767); //32767 here means the tree2d isn't filled there yet + for(unsigned long n = 0; n < numcodes; n++) //the codes + for(unsigned long i = 0; i < bitlen[n]; i++) //the bits for this code + { + unsigned long bit = (tree1d[n] >> (bitlen[n] - i - 1)) & 1; + if(treepos > numcodes - 2) return 55; + if(tree2d[2 * treepos + bit] == 32767) //not yet filled in + { + if(i + 1 == bitlen[n]) { tree2d[2 * treepos + bit] = n; treepos = 0; } //last bit + else { tree2d[2 * treepos + bit] = ++nodefilled + numcodes; treepos = nodefilled; } //addresses are encoded as values > numcodes + } + else treepos = tree2d[2 * treepos + bit] - numcodes; //subtract numcodes from address to get address value + } + return 0; + } + int decode(bool& decoded, unsigned long& result, size_t& treepos, unsigned long bit) const + { //Decodes a symbol from the tree + unsigned long numcodes = (unsigned long)tree2d.size() / 2; + if(treepos >= numcodes) return 11; //error: you appeared outside the codetree + result = tree2d[2 * treepos + bit]; + decoded = (result < numcodes); + treepos = decoded ? 0 : result - numcodes; + return 0; + } + std::vector tree2d; //2D representation of a huffman tree: The one dimension is "0" or "1", the other contains all nodes and leaves of the tree. + }; + struct Inflator + { + int error; + void inflate(std::vector& out, const std::vector& in, size_t inpos = 0) + { + size_t bp = 0, pos = 0; //bit pointer and byte pointer + error = 0; + unsigned long BFINAL = 0; + while(!BFINAL && !error) + { + if(bp >> 3 >= in.size()) { error = 52; return; } //error, bit pointer will jump past memory + BFINAL = readBitFromStream(bp, &in[inpos]); + unsigned long BTYPE = readBitFromStream(bp, &in[inpos]); BTYPE += 2 * readBitFromStream(bp, &in[inpos]); + if(BTYPE == 3) { error = 20; return; } //error: invalid BTYPE + else if(BTYPE == 0) inflateNoCompression(out, &in[inpos], bp, pos, in.size()); + else inflateHuffmanBlock(out, &in[inpos], bp, pos, in.size(), BTYPE); + } + if(!error) out.resize(pos); //Only now we know the true size of out, resize it to that + } + void generateFixedTrees(HuffmanTree& tree, HuffmanTree& treeD) //get the tree of a deflated block with fixed tree + { + std::vector bitlen(288, 8), bitlenD(32, 5);; + for(size_t i = 144; i <= 255; i++) bitlen[i] = 9; + for(size_t i = 256; i <= 279; i++) bitlen[i] = 7; + tree.makeFromLengths(bitlen, 15); + treeD.makeFromLengths(bitlenD, 15); + } + HuffmanTree codetree, codetreeD, codelengthcodetree; //the code tree for Huffman codes, dist codes, and code length codes + unsigned long huffmanDecodeSymbol(const unsigned char* in, size_t& bp, const HuffmanTree& codetree, size_t inlength) + { //decode a single symbol from given list of bits with given code tree. return value is the symbol + bool decoded; unsigned long ct; + for(size_t treepos = 0;;) + { + if((bp & 0x07) == 0 && (bp >> 3) > inlength) { error = 10; return 0; } //error: end reached without endcode + error = codetree.decode(decoded, ct, treepos, readBitFromStream(bp, in)); if(error) return 0; //stop, an error happened + if(decoded) return ct; + } + } + void getTreeInflateDynamic(HuffmanTree& tree, HuffmanTree& treeD, const unsigned char* in, size_t& bp, size_t inlength) + { //get the tree of a deflated block with dynamic tree, the tree itself is also Huffman compressed with a known tree + std::vector bitlen(288, 0), bitlenD(32, 0); + if(bp >> 3 >= inlength - 2) { error = 49; return; } //the bit pointer is or will go past the memory + size_t HLIT = readBitsFromStream(bp, in, 5) + 257; //number of literal/length codes + 257 + size_t HDIST = readBitsFromStream(bp, in, 5) + 1; //number of dist codes + 1 + size_t HCLEN = readBitsFromStream(bp, in, 4) + 4; //number of code length codes + 4 + std::vector codelengthcode(19); //lengths of tree to decode the lengths of the dynamic tree + for(size_t i = 0; i < 19; i++) codelengthcode[CLCL[i]] = (i < HCLEN) ? readBitsFromStream(bp, in, 3) : 0; + error = codelengthcodetree.makeFromLengths(codelengthcode, 7); if(error) return; + size_t i = 0, replength; + while(i < HLIT + HDIST) + { + unsigned long code = huffmanDecodeSymbol(in, bp, codelengthcodetree, inlength); if(error) return; + if(code <= 15) { if(i < HLIT) bitlen[i++] = code; else bitlenD[i++ - HLIT] = code; } //a length code + else if(code == 16) //repeat previous + { + if(bp >> 3 >= inlength) { error = 50; return; } //error, bit pointer jumps past memory + replength = 3 + readBitsFromStream(bp, in, 2); + unsigned long value; //set value to the previous code + if((i - 1) < HLIT) value = bitlen[i - 1]; + else value = bitlenD[i - HLIT - 1]; + for(size_t n = 0; n < replength; n++) //repeat this value in the next lengths + { + if(i >= HLIT + HDIST) { error = 13; return; } //error: i is larger than the amount of codes + if(i < HLIT) bitlen[i++] = value; else bitlenD[i++ - HLIT] = value; + } + } + else if(code == 17) //repeat "0" 3-10 times + { + if(bp >> 3 >= inlength) { error = 50; return; } //error, bit pointer jumps past memory + replength = 3 + readBitsFromStream(bp, in, 3); + for(size_t n = 0; n < replength; n++) //repeat this value in the next lengths + { + if(i >= HLIT + HDIST) { error = 14; return; } //error: i is larger than the amount of codes + if(i < HLIT) bitlen[i++] = 0; else bitlenD[i++ - HLIT] = 0; + } + } + else if(code == 18) //repeat "0" 11-138 times + { + if(bp >> 3 >= inlength) { error = 50; return; } //error, bit pointer jumps past memory + replength = 11 + readBitsFromStream(bp, in, 7); + for(size_t n = 0; n < replength; n++) //repeat this value in the next lengths + { + if(i >= HLIT + HDIST) { error = 15; return; } //error: i is larger than the amount of codes + if(i < HLIT) bitlen[i++] = 0; else bitlenD[i++ - HLIT] = 0; + } + } + else { error = 16; return; } //error: somehow an unexisting code appeared. This can never happen. + } + if(bitlen[256] == 0) { error = 64; return; } //the length of the end code 256 must be larger than 0 + error = tree.makeFromLengths(bitlen, 15); if(error) return; //now we've finally got HLIT and HDIST, so generate the code trees, and the function is done + error = treeD.makeFromLengths(bitlenD, 15); if(error) return; + } + void inflateHuffmanBlock(std::vector& out, const unsigned char* in, size_t& bp, size_t& pos, size_t inlength, unsigned long btype) + { + if(btype == 1) { generateFixedTrees(codetree, codetreeD); } + else if(btype == 2) { getTreeInflateDynamic(codetree, codetreeD, in, bp, inlength); if(error) return; } + for(;;) + { + unsigned long code = huffmanDecodeSymbol(in, bp, codetree, inlength); if(error) return; + if(code == 256) return; //end code + else if(code <= 255) //literal symbol + { + if(pos >= out.size()) out.resize((pos + 1) * 2); //reserve more room + out[pos++] = (unsigned char)(code); + } + else if(code >= 257 && code <= 285) //length code + { + size_t length = LENBASE[code - 257], numextrabits = LENEXTRA[code - 257]; + if((bp >> 3) >= inlength) { error = 51; return; } //error, bit pointer will jump past memory + length += readBitsFromStream(bp, in, numextrabits); + unsigned long codeD = huffmanDecodeSymbol(in, bp, codetreeD, inlength); if(error) return; + if(codeD > 29) { error = 18; return; } //error: invalid dist code (30-31 are never used) + unsigned long dist = DISTBASE[codeD], numextrabitsD = DISTEXTRA[codeD]; + if((bp >> 3) >= inlength) { error = 51; return; } //error, bit pointer will jump past memory + dist += readBitsFromStream(bp, in, numextrabitsD); + size_t start = pos, back = start - dist; //backwards + if(pos + length >= out.size()) out.resize((pos + length) * 2); //reserve more room + for(size_t i = 0; i < length; i++) { out[pos++] = out[back++]; if(back >= start) back = start - dist; } + } + } + } + void inflateNoCompression(std::vector& out, const unsigned char* in, size_t& bp, size_t& pos, size_t inlength) + { + while((bp & 0x7) != 0) bp++; //go to first boundary of byte + size_t p = bp / 8; + if(p >= inlength - 4) { error = 52; return; } //error, bit pointer will jump past memory + unsigned long LEN = in[p] + 256 * in[p + 1], NLEN = in[p + 2] + 256 * in[p + 3]; p += 4; + if(LEN + NLEN != 65535) { error = 21; return; } //error: NLEN is not one's complement of LEN + if(pos + LEN >= out.size()) out.resize(pos + LEN); + if(p + LEN > inlength) { error = 23; return; } //error: reading outside of in buffer + for(unsigned long n = 0; n < LEN; n++) out[pos++] = in[p++]; //read LEN bytes of literal data + bp = p * 8; + } + }; + int decompress(std::vector& out, const std::vector& in) //returns error value + { + Inflator inflator; + if(in.size() < 2) { return 53; } //error, size of zlib data too small + if((in[0] * 256 + in[1]) % 31 != 0) { return 24; } //error: 256 * in[0] + in[1] must be a multiple of 31, the FCHECK value is supposed to be made that way + unsigned long CM = in[0] & 15, CINFO = (in[0] >> 4) & 15, FDICT = (in[1] >> 5) & 1; + if(CM != 8 || CINFO > 7) { return 25; } //error: only compression method 8: inflate with sliding window of 32k is supported by the PNG spec + if(FDICT != 0) { return 26; } //error: the specification of PNG says about the zlib stream: "The additional flags shall not specify a preset dictionary." + inflator.inflate(out, in, 2); + return inflator.error; //note: adler32 checksum was skipped and ignored + } + }; + struct PNG //nested functions for PNG decoding + { + struct Info + { + unsigned long width, height, colorType, bitDepth, compressionMethod, filterMethod, interlaceMethod, key_r, key_g, key_b; + bool key_defined; //is a transparent color key given? + std::vector palette; + } info; + int error; + void decode(unsigned char* &out, const unsigned char* in, size_t size, bool convert_to_rgba32) + { + error = 0; + if(size == 0 || in == 0) { error = 48; return; } //the given data is empty + readPngHeader(&in[0], size); if(error) return; + size_t pos = 33; //first byte of the first chunk after the header + std::vector idat; //the data from idat chunks + bool IEND = false, known_type = true; + info.key_defined = false; + while(!IEND) //loop through the chunks, ignoring unknown chunks and stopping at IEND chunk. IDAT data is put at the start of the in buffer + { + if(pos + 8 >= size) { error = 30; return; } //error: size of the in buffer too small to contain next chunk + size_t chunkLength = read32bitInt(&in[pos]); pos += 4; + if(chunkLength > 2147483647) { error = 63; return; } + if(pos + chunkLength >= size) { error = 35; return; } //error: size of the in buffer too small to contain next chunk + if(in[pos + 0] == 'I' && in[pos + 1] == 'D' && in[pos + 2] == 'A' && in[pos + 3] == 'T') //IDAT chunk, containing compressed image data + { + idat.insert(idat.end(), &in[pos + 4], &in[pos + 4 + chunkLength]); + pos += (4 + chunkLength); + } + else if(in[pos + 0] == 'I' && in[pos + 1] == 'E' && in[pos + 2] == 'N' && in[pos + 3] == 'D') { pos += 4; IEND = true; } + else if(in[pos + 0] == 'P' && in[pos + 1] == 'L' && in[pos + 2] == 'T' && in[pos + 3] == 'E') //palette chunk (PLTE) + { + pos += 4; //go after the 4 letters + info.palette.resize(4 * (chunkLength / 3)); + if(info.palette.size() > (4 * 256)) { error = 38; return; } //error: palette too big + for(size_t i = 0; i < info.palette.size(); i += 4) + { + for(size_t j = 0; j < 3; j++) info.palette[i + j] = in[pos++]; //RGB + info.palette[i + 3] = 255; //alpha + } + } + else if(in[pos + 0] == 't' && in[pos + 1] == 'R' && in[pos + 2] == 'N' && in[pos + 3] == 'S') //palette transparency chunk (tRNS) + { + pos += 4; //go after the 4 letters + if(info.colorType == 3) + { + if(4 * chunkLength > info.palette.size()) { error = 39; return; } //error: more alpha values given than there are palette entries + for(size_t i = 0; i < chunkLength; i++) info.palette[4 * i + 3] = in[pos++]; + } + else if(info.colorType == 0) + { + if(chunkLength != 2) { error = 40; return; } //error: this chunk must be 2 bytes for greyscale image + info.key_defined = 1; info.key_r = info.key_g = info.key_b = 256 * in[pos] + in[pos + 1]; pos += 2; + } + else if(info.colorType == 2) + { + if(chunkLength != 6) { error = 41; return; } //error: this chunk must be 6 bytes for RGB image + info.key_defined = 1; + info.key_r = 256 * in[pos] + in[pos + 1]; pos += 2; + info.key_g = 256 * in[pos] + in[pos + 1]; pos += 2; + info.key_b = 256 * in[pos] + in[pos + 1]; pos += 2; + } + else { error = 42; return; } //error: tRNS chunk not allowed for other color models + } + else //it's not an implemented chunk type, so ignore it: skip over the data + { + if(!(in[pos + 0] & 32)) { error = 69; return; } //error: unknown critical chunk (5th bit of first byte of chunk type is 0) + pos += (chunkLength + 4); //skip 4 letters and uninterpreted data of unimplemented chunk + known_type = false; + } + pos += 4; //step over CRC (which is ignored) + } + unsigned long bpp = getBpp(info); + std::vector scanlines(((info.width * (info.height * bpp + 7)) / 8) + info.height); //now the out buffer will be filled + Zlib zlib; //decompress with the Zlib decompressor + error = zlib.decompress(scanlines, idat); if(error) return; //stop if the zlib decompressor returned an error + size_t bytewidth = (bpp + 7) / 8, outlength = (info.height * info.width * bpp + 7) / 8; + out = new unsigned char[outlength + 1]; //time to fill the out buffer + if(info.interlaceMethod == 0) //no interlace, just filter + { + size_t linestart = 0, linelength = (info.width * bpp + 7) / 8; //length in bytes of a scanline, excluding the filtertype byte + if(bpp >= 8) //byte per byte + for(unsigned long y = 0; y < info.height; y++) + { + unsigned long filterType = scanlines[linestart]; + const unsigned char* prevline = (y == 0) ? 0 : &out[(y - 1) * info.width * bytewidth]; + unFilterScanline(&out[linestart - y], &scanlines[linestart + 1], prevline, bytewidth, filterType, linelength); if(error) return; + linestart += (1 + linelength); //go to start of next scanline + } + else //less than 8 bits per pixel, so fill it up bit per bit + { + unsigned char* templine = new unsigned char[((info.width * bpp + 7) >> 3) + 1]; //only used if bpp < 8 + for(size_t y = 0, obp = 0; y < info.height; y++) + { + unsigned long filterType = scanlines[linestart]; + const unsigned char* prevline = (y == 0) ? 0 : &out[(y - 1) * info.width * bytewidth]; + unFilterScanline(templine, &scanlines[linestart + 1], prevline, bytewidth, filterType, linelength); if(error) return; + for(size_t bp = 0; bp < info.width * bpp;) setBitOfReversedStream(obp, out, readBitFromReversedStream(bp, &templine[0])); + linestart += (1 + linelength); //go to start of next scanline + } + delete[] templine; + } + } + if(convert_to_rgba32 && (info.colorType != 6 || info.bitDepth != 8)) //conversion needed + { + auto data = out; + error = convert(out, data, info, info.width, info.height); + } + } + void readPngHeader(const unsigned char* in, size_t inlength) //read the information from the header and store it in the Info + { + if(inlength < 29) { error = 27; return; } //error: the data length is smaller than the length of the header + if(in[0] != 137 || in[1] != 80 || in[2] != 78 || in[3] != 71 || in[4] != 13 || in[5] != 10 || in[6] != 26 || in[7] != 10) { error = 28; return; } //no PNG signature + if(in[12] != 'I' || in[13] != 'H' || in[14] != 'D' || in[15] != 'R') { error = 29; return; } //error: it doesn't start with a IHDR chunk! + info.width = read32bitInt(&in[16]); info.height = read32bitInt(&in[20]); + info.bitDepth = in[24]; info.colorType = in[25]; + info.compressionMethod = in[26]; if(in[26] != 0) { error = 32; return; } //error: only compression method 0 is allowed in the specification + info.filterMethod = in[27]; if(in[27] != 0) { error = 33; return; } //error: only filter method 0 is allowed in the specification + info.interlaceMethod = in[28]; if(in[28] > 1) { error = 34; return; } //error: only interlace methods 0 and 1 exist in the specification + error = checkColorValidity(info.colorType, info.bitDepth); + } + void unFilterScanline(unsigned char* recon, const unsigned char* scanline, const unsigned char* precon, size_t bytewidth, unsigned long filterType, size_t length) + { + switch(filterType) + { + case 0: for(size_t i = 0; i < length; i++) recon[i] = scanline[i]; break; + case 1: + for(size_t i = 0; i < bytewidth; i++) recon[i] = scanline[i]; + for(size_t i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth]; + break; + case 2: + if(precon) for(size_t i = 0; i < length; i++) recon[i] = scanline[i] + precon[i]; + else for(size_t i = 0; i < length; i++) recon[i] = scanline[i]; + break; + case 3: + if(precon) + { + for(size_t i = 0; i < bytewidth; i++) recon[i] = scanline[i] + precon[i] / 2; + for(size_t i = bytewidth; i < length; i++) recon[i] = scanline[i] + ((recon[i - bytewidth] + precon[i]) / 2); + } + else + { + for(size_t i = 0; i < bytewidth; i++) recon[i] = scanline[i]; + for(size_t i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth] / 2; + } + break; + case 4: + if(precon) + { + for(size_t i = 0; i < bytewidth; i++) recon[i] = scanline[i] + paethPredictor(0, precon[i], 0); + for(size_t i = bytewidth; i < length; i++) recon[i] = scanline[i] + paethPredictor(recon[i - bytewidth], precon[i], precon[i - bytewidth]); + } + else + { + for(size_t i = 0; i < bytewidth; i++) recon[i] = scanline[i]; + for(size_t i = bytewidth; i < length; i++) recon[i] = scanline[i] + paethPredictor(recon[i - bytewidth], 0, 0); + } + break; + default: error = 36; return; //error: unexisting filter type given + } + } + static unsigned long readBitFromReversedStream(size_t& bitp, const unsigned char* bits) { unsigned long result = (bits[bitp >> 3] >> (7 - (bitp & 0x7))) & 1; bitp++; return result;} + static unsigned long readBitsFromReversedStream(size_t& bitp, const unsigned char* bits, unsigned long nbits) + { + unsigned long result = 0; + for(size_t i = nbits - 1; i < nbits; i--) result += ((readBitFromReversedStream(bitp, bits)) << i); + return result; + } + void setBitOfReversedStream(size_t& bitp, unsigned char* bits, unsigned long bit) { bits[bitp >> 3] |= (bit << (7 - (bitp & 0x7))); bitp++; } + unsigned long read32bitInt(const unsigned char* buffer) { return (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]; } + int checkColorValidity(unsigned long colorType, unsigned long bd) //return type is a LodePNG error code + { + if((colorType == 2 || colorType == 4 || colorType == 6)) { if(!(bd == 8 || bd == 16)) return 37; else return 0; } + else if(colorType == 0) { if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16)) return 37; else return 0; } + else if(colorType == 3) { if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 )) return 37; else return 0; } + else return 31; //unexisting color type + } + unsigned long getBpp(const Info& info) + { + if(info.colorType == 2) return (3 * info.bitDepth); + else if(info.colorType >= 4) return (info.colorType - 2) * info.bitDepth; + else return info.bitDepth; + } + int convert(unsigned char* &out, const unsigned char* in, Info& infoIn, unsigned long w, unsigned long h) + { //converts from any color type to 32-bit. return value = LodePNG error code + size_t numpixels = w * h, bp = 0; + out = new unsigned char[numpixels * 4 + 1]; + if(infoIn.bitDepth == 8 && infoIn.colorType == 0) //greyscale + for(size_t i = 0; i < numpixels; i++) + { + out[4 * i + 0] = out[4 * i + 1] = out[4 * i + 2] = in[i]; + out[4 * i + 3] = (infoIn.key_defined && in[i] == infoIn.key_r) ? 0 : 255; + } + else if(infoIn.bitDepth == 8 && infoIn.colorType == 2) //RGB color + for(size_t i = 0; i < numpixels; i++) + { + for(size_t c = 0; c < 3; c++) out[4 * i + c] = in[3 * i + c]; + out[4 * i + 3] = (infoIn.key_defined == 1 && in[3 * i + 0] == infoIn.key_r && in[3 * i + 1] == infoIn.key_g && in[3 * i + 2] == infoIn.key_b) ? 0 : 255; + } + else if(infoIn.bitDepth == 8 && infoIn.colorType == 3) //indexed color (palette) + for(size_t i = 0; i < numpixels; i++) + { + if(4U * in[i] >= infoIn.palette.size()) return 46; + for(size_t c = 0; c < 4; c++) out[4 * i + c] = infoIn.palette[4 * in[i] + c]; //get rgb colors from the palette + } + else if(infoIn.bitDepth == 8 && infoIn.colorType == 4) //greyscale with alpha + for(size_t i = 0; i < numpixels; i++) + { + out[4 * i + 0] = out[4 * i + 1] = out[4 * i + 2] = in[2 * i + 0]; + out[4 * i + 3] = in[2 * i + 1]; + } + else if(infoIn.bitDepth == 8 && infoIn.colorType == 6) for(size_t i = 0; i < numpixels; i++) for(size_t c = 0; c < 4; c++) out[4 * i + c] = in[4 * i + c]; //RGB with alpha + else if(infoIn.bitDepth == 16 && infoIn.colorType == 0) //greyscale + for(size_t i = 0; i < numpixels; i++) + { + out[4 * i + 0] = out[4 * i + 1] = out[4 * i + 2] = in[2 * i]; + out[4 * i + 3] = (infoIn.key_defined && 256U * in[i] + in[i + 1] == infoIn.key_r) ? 0 : 255; + } + else if(infoIn.bitDepth == 16 && infoIn.colorType == 2) //RGB color + for(size_t i = 0; i < numpixels; i++) + { + for(size_t c = 0; c < 3; c++) out[4 * i + c] = in[6 * i + 2 * c]; + out[4 * i + 3] = (infoIn.key_defined && 256U*in[6*i+0]+in[6*i+1] == infoIn.key_r && 256U*in[6*i+2]+in[6*i+3] == infoIn.key_g && 256U*in[6*i+4]+in[6*i+5] == infoIn.key_b) ? 0 : 255; + } + else if(infoIn.bitDepth == 16 && infoIn.colorType == 4) //greyscale with alpha + for(size_t i = 0; i < numpixels; i++) + { + out[4 * i + 0] = out[4 * i + 1] = out[4 * i + 2] = in[4 * i]; //most significant byte + out[4 * i + 3] = in[4 * i + 2]; + } + else if(infoIn.bitDepth == 16 && infoIn.colorType == 6) for(size_t i = 0; i < numpixels; i++) for(size_t c = 0; c < 4; c++) out[4 * i + c] = in[8 * i + 2 * c]; //RGB with alpha + else if(infoIn.bitDepth < 8 && infoIn.colorType == 0) //greyscale + for(size_t i = 0; i < numpixels; i++) + { + unsigned long value = (readBitsFromReversedStream(bp, in, infoIn.bitDepth) * 255) / ((1 << infoIn.bitDepth) - 1); //scale value from 0 to 255 + out[4 * i + 0] = out[4 * i + 1] = out[4 * i + 2] = (unsigned char)(value); + out[4 * i + 3] = (infoIn.key_defined && value && ((1U << infoIn.bitDepth) - 1U) == infoIn.key_r && ((1U << infoIn.bitDepth) - 1U)) ? 0 : 255; + } + else if(infoIn.bitDepth < 8 && infoIn.colorType == 3) //palette + for(size_t i = 0; i < numpixels; i++) + { + unsigned long value = readBitsFromReversedStream(bp, in, infoIn.bitDepth); + if(4 * value >= infoIn.palette.size()) return 47; + for(size_t c = 0; c < 4; c++) out[4 * i + c] = infoIn.palette[4 * value + c]; //get rgb colors from the palette + } + return 0; + } + unsigned char paethPredictor(short a, short b, short c) //Paeth predicter, used by PNG filter type 4 + { + short p = a + b - c, pa = p > a ? (p - a) : (a - p), pb = p > b ? (p - b) : (b - p), pc = p > c ? (p - c) : (c - p); + return (unsigned char)((pa <= pb && pa <= pc) ? a : pb <= pc ? b : c); + } + }; + PNG decoder; decoder.decode(out_image, in_png, in_size, convert_to_rgba32); + image_width = decoder.info.width; image_height = decoder.info.height; + return decoder.error; +} \ No newline at end of file