#include #include "pm_c_util.h" #include "mallocvar.h" #include "pm.h" #include "pngx.h" static void errorHandler(png_structp const png_ptr, png_const_charp const msg) { jmp_buf * jmpbufP; /* this function, aside from the extra step of retrieving the "error pointer" (below) and the fact that it exists within the application rather than within libpng, is essentially identical to libpng's default error handler. The second point is critical: since both setjmp() and longjmp() are called from the same code, they are guaranteed to have compatible notions of how big a jmp_buf is, regardless of whether _BSD_SOURCE or anything else has (or has not) been defined. */ pm_message("fatal libpng error: %s", msg); jmpbufP = png_get_error_ptr(png_ptr); if (!jmpbufP) { /* we are completely hosed now */ pm_error("EXTREMELY fatal error: jmpbuf unrecoverable; terminating."); } longjmp(*jmpbufP, 1); } void pngx_create(struct pngx ** const pngxPP, pngx_rw const rw, jmp_buf * const jmpbufP) { struct pngx * pngxP; MALLOCVAR(pngxP); if (!pngxP) pm_error("Failed to allocate memory for PNG object"); else { pngxP->numPassesRequired = 1; switch(rw) { case PNGX_READ: pngxP->png_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING, jmpbufP, errorHandler, NULL); break; case PNGX_WRITE: pngxP->png_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, jmpbufP, errorHandler, NULL); break; } if (!pngxP->png_ptr) pm_error("cannot allocate main libpng structure (png_ptr)"); else { pngxP->info_ptr = png_create_info_struct(pngxP->png_ptr); if (!pngxP->info_ptr) pm_error("cannot allocate libpng info structure (info_ptr)"); else *pngxPP = pngxP; } pngxP->rw = rw; } } void pngx_destroy(struct pngx * const pngxP) { switch(pngxP->rw) { case PNGX_READ: png_destroy_read_struct(&pngxP->png_ptr, &pngxP->info_ptr, NULL); break; case PNGX_WRITE: png_destroy_write_struct(&pngxP->png_ptr, &pngxP->info_ptr); break; } free(pngxP); } bool pngx_chunkIsPresent(struct pngx * const pngxP, uint32_t const chunkType) { return png_get_valid(pngxP->png_ptr, pngxP->info_ptr, chunkType); } void pngx_setCompressionSize(struct pngx * const pngxP, int const bufferSize) { #if PNG_LIBPNG_VER >= 10009 png_set_compression_buffer_size(pngxP->png_ptr, bufferSize); #else pm_error("Your PNG library cannot set the compression buffer size. " "You need at least Version 1.0.9 of Libpng; you have Version %s", PNG_LIBPNG_VER_STRING); #endif } void pngx_setInterlaceHandling(struct pngx * const pngxP) { pngxP->numPassesRequired = png_set_interlace_handling(pngxP->png_ptr); } void pngx_setFilter(struct pngx * const pngxP, int const filterSet) { png_set_filter(pngxP->png_ptr, 0, filterSet); } void pngx_setPacking(struct pngx * const pngxP) { png_set_packing(pngxP->png_ptr); } void pngx_setText(struct pngx * const pngxP, png_textp const textP, unsigned int const count) { png_set_text(pngxP->png_ptr, pngxP->info_ptr, textP, count); } void pngx_setIhdr(struct pngx * const pngxP, unsigned int const width, unsigned int const height, unsigned int const bitDepth, int const colorType, int const interlaceMethod, int const compressionMethod, int const filterMethod) { png_set_IHDR(pngxP->png_ptr, pngxP->info_ptr, width, height, bitDepth, colorType, interlaceMethod, compressionMethod, filterMethod); } png_byte pngx_colorType(struct pngx * const pngxP) { return png_get_color_type(pngxP->png_ptr, pngxP->info_ptr); } void pngx_setGama(struct pngx * const pngxP, float const fileGamma) { png_set_gAMA(pngxP->png_ptr, pngxP->info_ptr, fileGamma); } void pngx_setChrm(struct pngx * const pngxP, struct pngx_chroma const chroma) { png_set_cHRM(pngxP->png_ptr, pngxP->info_ptr, chroma.wx, chroma.wy, chroma.rx, chroma.ry, chroma.gx, chroma.gy, chroma.bx, chroma.by); } void pngx_setPhys(struct pngx * const pngxP, struct pngx_phys const phys) { png_set_pHYs(pngxP->png_ptr, pngxP->info_ptr, phys.x, phys.y, phys.unit); } void pngx_setTime(struct pngx * const pngxP, png_time const timeArg) { png_time time; time = timeArg; png_set_tIME(pngxP->png_ptr, pngxP->info_ptr, &time); } void pngx_setSbit(struct pngx * const pngxP, png_color_8 const sbitArg) { png_color_8 sbit; sbit = sbitArg; png_set_sBIT(pngxP->png_ptr, pngxP->info_ptr, &sbit); } void pngx_setPlte(struct pngx * const pngxP, png_color * const palette, unsigned int const paletteSize) { png_set_PLTE(pngxP->png_ptr, pngxP->info_ptr, palette, paletteSize); } void pngx_setTrnsPalette(struct pngx * const pngxP, const png_byte * const transPalette, unsigned int const paletteSize) { png_set_tRNS(pngxP->png_ptr, pngxP->info_ptr, (png_byte *)transPalette, paletteSize, NULL); } void pngx_setTrnsValue(struct pngx * const pngxP, png_color_16 const transColorArg) { png_color_16 transColor; transColor = transColorArg; png_set_tRNS(pngxP->png_ptr, pngxP->info_ptr, NULL, 0, &transColor); } void pngx_setHist(struct pngx * const pngxP, png_uint_16 * const histogram) { png_set_hIST(pngxP->png_ptr, pngxP->info_ptr, histogram); } struct pngx_trans pngx_getTrns(struct pngx * const pngxP) { struct pngx_trans retval; png_get_tRNS(pngxP->png_ptr, pngxP->info_ptr, &retval.trans, &retval.numTrans, &retval.transColorP); return retval; } void pngx_setBkgdPalette(struct pngx * const pngxP, unsigned int const backgroundIndex) { png_color_16 background; background.index = backgroundIndex; png_set_bKGD(pngxP->png_ptr, pngxP->info_ptr, &background); } void pngx_setBkgdRgb(struct pngx * const pngxP, png_color_16 const backgroundArg) { png_color_16 background; background = backgroundArg; png_set_bKGD(pngxP->png_ptr, pngxP->info_ptr, &background); } void pngx_writeInfo(struct pngx * const pngxP) { png_write_info(pngxP->png_ptr, pngxP->info_ptr); } void pngx_writeRow(struct pngx * const pngxP, const png_byte * const line) { png_write_row(pngxP->png_ptr, (png_byte *)line); } void pngx_writeEnd(struct pngx * const pngxP) { png_write_end(pngxP->png_ptr, pngxP->info_ptr); }