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Remove stb_image
This commit is contained in:
Henrik Rydgård
parent
ca0a6dc7f9
commit
9fa4e65fb6
@ -1,7 +0,0 @@
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cmake_minimum_required(VERSION 2.6)
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#if(UNIX)
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add_definitions(-fPIC)
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#endif(UNIX)
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add_library(stb_image stb_image.c)
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File diff suppressed because it is too large
Load Diff
@ -1,262 +0,0 @@
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#pragma once
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//// begin header file ////////////////////////////////////////////////////
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//
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// Limitations:
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// - no jpeg progressive support
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// - non-HDR formats support 8-bit samples only (jpeg, png)
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// - no delayed line count (jpeg) -- IJG doesn't support either
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// - no 1-bit BMP
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// - GIF always returns *comp=4
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//
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// Basic usage (see HDR discussion below):
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// int x,y,n;
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// unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
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// // ... process data if not NULL ...
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// // ... x = width, y = height, n = # 8-bit components per pixel ...
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// // ... replace '0' with '1'..'4' to force that many components per pixel
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// // ... but 'n' will always be the number that it would have been if you said 0
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// stbi_image_free(data)
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//
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// Standard parameters:
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// int *x -- outputs image width in pixels
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// int *y -- outputs image height in pixels
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// int *comp -- outputs # of image components in image file
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// int req_comp -- if non-zero, # of image components requested in result
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//
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// The return value from an image loader is an 'unsigned char *' which points
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// to the pixel data. The pixel data consists of *y scanlines of *x pixels,
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// with each pixel consisting of N interleaved 8-bit components; the first
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// pixel pointed to is top-left-most in the image. There is no padding between
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// image scanlines or between pixels, regardless of format. The number of
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// components N is 'req_comp' if req_comp is non-zero, or *comp otherwise.
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// If req_comp is non-zero, *comp has the number of components that _would_
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// have been output otherwise. E.g. if you set req_comp to 4, you will always
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// get RGBA output, but you can check *comp to easily see if it's opaque.
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//
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// An output image with N components has the following components interleaved
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// in this order in each pixel:
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//
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// N=#comp components
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// 1 grey
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// 2 grey, alpha
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// 3 red, green, blue
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// 4 red, green, blue, alpha
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//
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// If image loading fails for any reason, the return value will be NULL,
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// and *x, *y, *comp will be unchanged. The function stbi_failure_reason()
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// can be queried for an extremely brief, end-user unfriendly explanation
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// of why the load failed. Define STBI_NO_FAILURE_STRINGS to avoid
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// compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly
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// more user-friendly ones.
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//
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// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized.
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//
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// ===========================================================================
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//
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// iPhone PNG support:
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//
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// By default we convert iphone-formatted PNGs back to RGB; nominally they
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// would silently load as BGR, except the existing code should have just
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// failed on such iPhone PNGs. But you can disable this conversion by
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// by calling stbi_convert_iphone_png_to_rgb(0), in which case
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// you will always just get the native iphone "format" through.
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//
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// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per
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// pixel to remove any premultiplied alpha *only* if the image file explicitly
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// says there's premultiplied data (currently only happens in iPhone images,
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// and only if iPhone convert-to-rgb processing is on).
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//
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// ===========================================================================
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//
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// HDR image support (disable by defining STBI_NO_HDR)
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//
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// stb_image now supports loading HDR images in general, and currently
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// the Radiance .HDR file format, although the support is provided
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// generically. You can still load any file through the existing interface;
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// if you attempt to load an HDR file, it will be automatically remapped to
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// LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1;
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// both of these constants can be reconfigured through this interface:
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//
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// stbi_hdr_to_ldr_gamma(2.2f);
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// stbi_hdr_to_ldr_scale(1.0f);
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//
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// (note, do not use _inverse_ constants; stbi_image will invert them
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// appropriately).
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//
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// Additionally, there is a new, parallel interface for loading files as
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// (linear) floats to preserve the full dynamic range:
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//
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// float *data = stbi_loadf(filename, &x, &y, &n, 0);
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//
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// If you load LDR images through this interface, those images will
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// be promoted to floating point values, run through the inverse of
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// constants corresponding to the above:
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//
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// stbi_ldr_to_hdr_scale(1.0f);
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// stbi_ldr_to_hdr_gamma(2.2f);
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//
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// Finally, given a filename (or an open file or memory block--see header
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// file for details) containing image data, you can query for the "most
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// appropriate" interface to use (that is, whether the image is HDR or
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// not), using:
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//
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// stbi_is_hdr(char *filename);
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//
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// ===========================================================================
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//
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// I/O callbacks
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//
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// I/O callbacks allow you to read from arbitrary sources, like packaged
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// files or some other source. Data read from callbacks are processed
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// through a small internal buffer (currently 128 bytes) to try to reduce
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// overhead.
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//
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// The three functions you must define are "read" (reads some bytes of data),
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// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end).
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#ifndef STBI_NO_STDIO
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#if defined(_MSC_VER) && _MSC_VER >= 0x1400
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#define _CRT_SECURE_NO_WARNINGS // suppress bogus warnings about fopen()
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#endif
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#include <stdio.h>
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#endif
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#define STBI_VERSION 1
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enum
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{
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STBI_default = 0, // only used for req_comp
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STBI_grey = 1,
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STBI_grey_alpha = 2,
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STBI_rgb = 3,
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STBI_rgb_alpha = 4
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};
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typedef unsigned char stbi_uc;
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#ifdef __cplusplus
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extern "C" {
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#endif
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//////////////////////////////////////////////////////////////////////////////
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//
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// PRIMARY API - works on images of any type
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//
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//
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// load image by filename, open file, or memory buffer
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//
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extern stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
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#ifndef STBI_NO_STDIO
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extern stbi_uc *stbi_load (char const *filename, int *x, int *y, int *comp, int req_comp);
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extern stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp);
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// for stbi_load_from_file, file pointer is left pointing immediately after image
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#endif
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typedef struct
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{
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int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read
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void (*skip) (void *user,unsigned n); // skip the next 'n' bytes
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int (*eof) (void *user); // returns nonzero if we are at end of file/data
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} stbi_io_callbacks;
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extern stbi_uc *stbi_load_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp);
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#ifndef STBI_NO_HDR
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extern float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
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#ifndef STBI_NO_STDIO
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extern float *stbi_loadf (char const *filename, int *x, int *y, int *comp, int req_comp);
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extern float *stbi_loadf_from_file (FILE *f, int *x, int *y, int *comp, int req_comp);
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#endif
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extern float *stbi_loadf_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp);
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extern void stbi_hdr_to_ldr_gamma(float gamma);
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extern void stbi_hdr_to_ldr_scale(float scale);
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extern void stbi_ldr_to_hdr_gamma(float gamma);
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extern void stbi_ldr_to_hdr_scale(float scale);
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#endif // STBI_NO_HDR
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// stbi_is_hdr is always defined
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extern int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user);
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extern int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
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#ifndef STBI_NO_STDIO
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extern int stbi_is_hdr (char const *filename);
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extern int stbi_is_hdr_from_file(FILE *f);
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#endif // STBI_NO_STDIO
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// get a VERY brief reason for failure
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// NOT THREADSAFE
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extern const char *stbi_failure_reason (void);
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// free the loaded image -- this is just free()
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extern void stbi_image_free (void *retval_from_stbi_load);
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// get image dimensions & components without fully decoding
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extern int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
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extern int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp);
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#ifndef STBI_NO_STDIO
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extern int stbi_info (char const *filename, int *x, int *y, int *comp);
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extern int stbi_info_from_file (FILE *f, int *x, int *y, int *comp);
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#endif
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// for image formats that explicitly notate that they have premultiplied alpha,
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// we just return the colors as stored in the file. set this flag to force
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// unpremultiplication. results are undefined if the unpremultiply overflow.
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extern void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
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// indicate whether we should process iphone images back to canonical format,
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// or just pass them through "as-is"
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extern void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
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// ZLIB client - used by PNG, available for other purposes
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extern char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen);
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extern char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
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extern int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
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extern char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
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extern int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
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// define faster low-level operations (typically SIMD support)
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#ifdef STBI_SIMD
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typedef void (*stbi_idct_8x8)(stbi_uc *out, int out_stride, short data[64], unsigned short *dequantize);
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// compute an integer IDCT on "input"
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// input[x] = data[x] * dequantize[x]
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// write results to 'out': 64 samples, each run of 8 spaced by 'out_stride'
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// CLAMP results to 0..255
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typedef void (*stbi_YCbCr_to_RGB_run)(stbi_uc *output, stbi_uc const *y, stbi_uc const *cb, stbi_uc const *cr, int count, int step);
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// compute a conversion from YCbCr to RGB
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// 'count' pixels
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// write pixels to 'output'; each pixel is 'step' bytes (either 3 or 4; if 4, write '255' as 4th), order R,G,B
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// y: Y input channel
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// cb: Cb input channel; scale/biased to be 0..255
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// cr: Cr input channel; scale/biased to be 0..255
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extern void stbi_install_idct(stbi_idct_8x8 func);
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extern void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func);
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#endif // STBI_SIMD
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#ifdef __cplusplus
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}
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#endif
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//
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//
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//// end header file /////////////////////////////////////////////////////
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@ -1,2 +0,0 @@
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#define STB_IMAGE_WRITE_IMPLEMENTATION
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#include "ext/stb_image_write/stb_image_writer.h"
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@ -1,511 +0,0 @@
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/* stbiw-0.92 - public domain - http://nothings.org/stb/stb_image_write.h
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writes out PNG/BMP/TGA images to C stdio - Sean Barrett 2010
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no warranty implied; use at your own risk
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Before including,
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#define STB_IMAGE_WRITE_IMPLEMENTATION
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in the file that you want to have the implementation.
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ABOUT:
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This header file is a library for writing images to C stdio. It could be
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adapted to write to memory or a general streaming interface; let me know.
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The PNG output is not optimal; it is 20-50% larger than the file
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written by a decent optimizing implementation. This library is designed
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for source code compactness and simplicitly, not optimal image file size
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or run-time performance.
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USAGE:
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There are three functions, one for each image file format:
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int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);
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int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
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int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data);
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Each function returns 0 on failure and non-0 on success.
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The functions create an image file defined by the parameters. The image
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is a rectangle of pixels stored from left-to-right, top-to-bottom.
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Each pixel contains 'comp' channels of data stored interleaved with 8-bits
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per channel, in the following order: 1=Y, 2=YA, 3=RGB, 4=RGBA. (Y is
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monochrome color.) The rectangle is 'w' pixels wide and 'h' pixels tall.
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The *data pointer points to the first byte of the top-left-most pixel.
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For PNG, "stride_in_bytes" is the distance in bytes from the first byte of
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a row of pixels to the first byte of the next row of pixels.
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PNG creates output files with the same number of components as the input.
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The BMP and TGA formats expand Y to RGB in the file format. BMP does not
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output alpha.
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PNG supports writing rectangles of data even when the bytes storing rows of
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data are not consecutive in memory (e.g. sub-rectangles of a larger image),
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by supplying the stride between the beginning of adjacent rows. The other
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formats do not. (Thus you cannot write a native-format BMP through the BMP
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writer, both because it is in BGR order and because it may have padding
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at the end of the line.)
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*/
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#ifndef INCLUDE_STB_IMAGE_WRITE_H
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#define INCLUDE_STB_IMAGE_WRITE_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);
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extern int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
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extern int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data);
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#ifdef __cplusplus
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}
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#endif
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#endif//INCLUDE_STB_IMAGE_WRITE_H
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#ifdef STB_IMAGE_WRITE_IMPLEMENTATION
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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typedef unsigned int stbiw_uint32;
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typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1];
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static void writefv(FILE *f, const char *fmt, va_list v)
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{
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while (*fmt) {
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switch (*fmt++) {
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case ' ': break;
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case '1': { unsigned char x = (unsigned char) va_arg(v, int); fputc(x,f); break; }
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case '2': { int x = va_arg(v,int); unsigned char b[2];
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b[0] = (unsigned char) x; b[1] = (unsigned char) (x>>8);
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fwrite(b,2,1,f); break; }
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case '4': { stbiw_uint32 x = va_arg(v,int); unsigned char b[4];
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b[0]=(unsigned char)x; b[1]=(unsigned char)(x>>8);
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b[2]=(unsigned char)(x>>16); b[3]=(unsigned char)(x>>24);
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fwrite(b,4,1,f); break; }
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default:
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assert(0);
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return;
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}
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}
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}
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static void write3(FILE *f, unsigned char a, unsigned char b, unsigned char c)
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{
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unsigned char arr[3];
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arr[0] = a, arr[1] = b, arr[2] = c;
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fwrite(arr, 3, 1, f);
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}
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static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad)
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{
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unsigned char bg[3] = { 255, 0, 255}, px[3];
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stbiw_uint32 zero = 0;
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int i,j,k, j_end;
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if (y <= 0)
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return;
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if (vdir < 0)
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j_end = -1, j = y-1;
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else
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j_end = y, j = 0;
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for (; j != j_end; j += vdir) {
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for (i=0; i < x; ++i) {
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unsigned char *d = (unsigned char *) data + (j*x+i)*comp;
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if (write_alpha < 0)
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fwrite(&d[comp-1], 1, 1, f);
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switch (comp) {
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case 1:
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case 2: write3(f, d[0],d[0],d[0]);
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break;
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case 4:
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if (!write_alpha) {
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// composite against pink background
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for (k=0; k < 3; ++k)
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px[k] = bg[k] + ((d[k] - bg[k]) * d[3])/255;
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write3(f, px[1-rgb_dir],px[1],px[1+rgb_dir]);
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break;
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}
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/* FALLTHROUGH */
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case 3:
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write3(f, d[1-rgb_dir],d[1],d[1+rgb_dir]);
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||||
break;
|
||||
}
|
||||
if (write_alpha > 0)
|
||||
fwrite(&d[comp-1], 1, 1, f);
|
||||
}
|
||||
fwrite(&zero,scanline_pad,1,f);
|
||||
}
|
||||
}
|
||||
|
||||
static int outfile(char const *filename, int rgb_dir, int vdir, int x, int y, int comp, void *data, int alpha, int pad, const char *fmt, ...)
|
||||
{
|
||||
FILE *f;
|
||||
if (y < 0 || x < 0) return 0;
|
||||
f = fopen(filename, "wb");
|
||||
if (f) {
|
||||
va_list v;
|
||||
va_start(v, fmt);
|
||||
writefv(f, fmt, v);
|
||||
va_end(v);
|
||||
write_pixels(f,rgb_dir,vdir,x,y,comp,data,alpha,pad);
|
||||
fclose(f);
|
||||
}
|
||||
return f != NULL;
|
||||
}
|
||||
|
||||
int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *data)
|
||||
{
|
||||
int pad = (-x*3) & 3;
|
||||
return outfile(filename,-1,-1,x,y,comp,(void *) data,0,pad,
|
||||
"11 4 22 4" "4 44 22 444444",
|
||||
'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header
|
||||
40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header
|
||||
}
|
||||
|
||||
int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data)
|
||||
{
|
||||
int has_alpha = !(comp & 1);
|
||||
return outfile(filename, -1,-1, x, y, comp, (void *) data, has_alpha, 0,
|
||||
"111 221 2222 11", 0,0,2, 0,0,0, 0,0,x,y, 24+8*has_alpha, 8*has_alpha);
|
||||
}
|
||||
|
||||
// stretchy buffer; stbi__sbpush() == vector<>::push_back() -- stbi__sbcount() == vector<>::size()
|
||||
#define stbi__sbraw(a) ((int *) (a) - 2)
|
||||
#define stbi__sbm(a) stbi__sbraw(a)[0]
|
||||
#define stbi__sbn(a) stbi__sbraw(a)[1]
|
||||
|
||||
#define stbi__sbneedgrow(a,n) ((a)==0 || stbi__sbn(a)+n >= stbi__sbm(a))
|
||||
#define stbi__sbmaybegrow(a,n) (stbi__sbneedgrow(a,(n)) ? stbi__sbgrow(a,n) : 0)
|
||||
#define stbi__sbgrow(a,n) stbi__sbgrowf((void **) &(a), (n), sizeof(*(a)))
|
||||
|
||||
#define stbi__sbpush(a, v) (stbi__sbmaybegrow(a,1), (a)[stbi__sbn(a)++] = (v))
|
||||
#define stbi__sbcount(a) ((a) ? stbi__sbn(a) : 0)
|
||||
#define stbi__sbfree(a) ((a) ? free(stbi__sbraw(a)),0 : 0)
|
||||
|
||||
static void *stbi__sbgrowf(void **arr, int increment, int itemsize)
|
||||
{
|
||||
int m = *arr ? 2*stbi__sbm(*arr)+increment : increment+1;
|
||||
void *p = realloc(*arr ? stbi__sbraw(*arr) : 0, itemsize * m + sizeof(int)*2);
|
||||
assert(p);
|
||||
if (p) {
|
||||
if (!*arr) ((int *) p)[1] = 0;
|
||||
*arr = (void *) ((int *) p + 2);
|
||||
stbi__sbm(*arr) = m;
|
||||
}
|
||||
return *arr;
|
||||
}
|
||||
|
||||
static unsigned char *stbi__zlib_flushf(unsigned char *data, unsigned int *bitbuffer, int *bitcount)
|
||||
{
|
||||
while (*bitcount >= 8) {
|
||||
stbi__sbpush(data, (unsigned char) *bitbuffer);
|
||||
*bitbuffer >>= 8;
|
||||
*bitcount -= 8;
|
||||
}
|
||||
return data;
|
||||
}
|
||||
|
||||
static int stbi__zlib_bitrev(int code, int codebits)
|
||||
{
|
||||
int res=0;
|
||||
while (codebits--) {
|
||||
res = (res << 1) | (code & 1);
|
||||
code >>= 1;
|
||||
}
|
||||
return res;
|
||||
}
|
||||
|
||||
static unsigned int stbi__zlib_countm(unsigned char *a, unsigned char *b, int limit)
|
||||
{
|
||||
int i;
|
||||
for (i=0; i < limit && i < 258; ++i)
|
||||
if (a[i] != b[i]) break;
|
||||
return i;
|
||||
}
|
||||
|
||||
static unsigned int stbi__zhash(unsigned char *data)
|
||||
{
|
||||
stbiw_uint32 hash = data[0] + (data[1] << 8) + (data[2] << 16);
|
||||
hash ^= hash << 3;
|
||||
hash += hash >> 5;
|
||||
hash ^= hash << 4;
|
||||
hash += hash >> 17;
|
||||
hash ^= hash << 25;
|
||||
hash += hash >> 6;
|
||||
return hash;
|
||||
}
|
||||
|
||||
#define stbi__zlib_flush() (out = stbi__zlib_flushf(out, &bitbuf, &bitcount))
|
||||
#define stbi__zlib_add(code,codebits) \
|
||||
(bitbuf |= (code) << bitcount, bitcount += (codebits), stbi__zlib_flush())
|
||||
#define stbi__zlib_huffa(b,c) stbi__zlib_add(stbi__zlib_bitrev(b,c),c)
|
||||
// default huffman tables
|
||||
#define stbi__zlib_huff1(n) stbi__zlib_huffa(0x30 + (n), 8)
|
||||
#define stbi__zlib_huff2(n) stbi__zlib_huffa(0x190 + (n)-144, 9)
|
||||
#define stbi__zlib_huff3(n) stbi__zlib_huffa(0 + (n)-256,7)
|
||||
#define stbi__zlib_huff4(n) stbi__zlib_huffa(0xc0 + (n)-280,8)
|
||||
#define stbi__zlib_huff(n) ((n) <= 143 ? stbi__zlib_huff1(n) : (n) <= 255 ? stbi__zlib_huff2(n) : (n) <= 279 ? stbi__zlib_huff3(n) : stbi__zlib_huff4(n))
|
||||
#define stbi__zlib_huffb(n) ((n) <= 143 ? stbi__zlib_huff1(n) : stbi__zlib_huff2(n))
|
||||
|
||||
#define stbi__ZHASH 16384
|
||||
|
||||
unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality)
|
||||
{
|
||||
static unsigned short lengthc[] = { 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, 259 };
|
||||
static unsigned char lengtheb[]= { 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 unsigned short distc[] = { 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, 32768 };
|
||||
static unsigned char disteb[] = { 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 };
|
||||
unsigned int bitbuf=0;
|
||||
int i,j, bitcount=0;
|
||||
unsigned char *out = NULL;
|
||||
unsigned char **hash_table[stbi__ZHASH]; // 64KB on the stack!
|
||||
if (quality < 5) quality = 5;
|
||||
|
||||
stbi__sbpush(out, 0x78); // DEFLATE 32K window
|
||||
stbi__sbpush(out, 0x5e); // FLEVEL = 1
|
||||
stbi__zlib_add(1,1); // BFINAL = 1
|
||||
stbi__zlib_add(1,2); // BTYPE = 1 -- fixed huffman
|
||||
|
||||
for (i=0; i < stbi__ZHASH; ++i)
|
||||
hash_table[i] = NULL;
|
||||
|
||||
i=0;
|
||||
while (i < data_len-3) {
|
||||
// hash next 3 bytes of data to be compressed
|
||||
int h = stbi__zhash(data+i)&(stbi__ZHASH-1), best=3;
|
||||
unsigned char *bestloc = 0;
|
||||
unsigned char **hlist = hash_table[h];
|
||||
int n = stbi__sbcount(hlist);
|
||||
for (j=0; j < n; ++j) {
|
||||
if (hlist[j]-data > i-32768) { // if entry lies within window
|
||||
int d = stbi__zlib_countm(hlist[j], data+i, data_len-i);
|
||||
if (d >= best) best=d,bestloc=hlist[j];
|
||||
}
|
||||
}
|
||||
// when hash table entry is too long, delete half the entries
|
||||
if (hash_table[h] && stbi__sbn(hash_table[h]) == 2*quality) {
|
||||
memcpy(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality);
|
||||
stbi__sbn(hash_table[h]) = quality;
|
||||
}
|
||||
stbi__sbpush(hash_table[h],data+i);
|
||||
|
||||
if (bestloc) {
|
||||
// "lazy matching" - check match at *next* byte, and if it's better, do cur byte as literal
|
||||
h = stbi__zhash(data+i+1)&(stbi__ZHASH-1);
|
||||
hlist = hash_table[h];
|
||||
n = stbi__sbcount(hlist);
|
||||
for (j=0; j < n; ++j) {
|
||||
if (hlist[j]-data > i-32767) {
|
||||
int e = stbi__zlib_countm(hlist[j], data+i+1, data_len-i-1);
|
||||
if (e > best) { // if next match is better, bail on current match
|
||||
bestloc = NULL;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (bestloc) {
|
||||
int d = data+i - bestloc; // distance back
|
||||
assert(d <= 32767 && best <= 258);
|
||||
for (j=0; best > lengthc[j+1]-1; ++j);
|
||||
stbi__zlib_huff(j+257);
|
||||
if (lengtheb[j]) stbi__zlib_add(best - lengthc[j], lengtheb[j]);
|
||||
for (j=0; d > distc[j+1]-1; ++j);
|
||||
stbi__zlib_add(stbi__zlib_bitrev(j,5),5);
|
||||
if (disteb[j]) stbi__zlib_add(d - distc[j], disteb[j]);
|
||||
i += best;
|
||||
} else {
|
||||
stbi__zlib_huffb(data[i]);
|
||||
++i;
|
||||
}
|
||||
}
|
||||
// write out final bytes
|
||||
for (;i < data_len; ++i)
|
||||
stbi__zlib_huffb(data[i]);
|
||||
stbi__zlib_huff(256); // end of block
|
||||
// pad with 0 bits to byte boundary
|
||||
while (bitcount)
|
||||
stbi__zlib_add(0,1);
|
||||
|
||||
for (i=0; i < stbi__ZHASH; ++i)
|
||||
(void) stbi__sbfree(hash_table[i]);
|
||||
|
||||
{
|
||||
// compute adler32 on input
|
||||
unsigned int i=0, s1=1, s2=0, blocklen = data_len % 5552;
|
||||
int j=0;
|
||||
while (j < data_len) {
|
||||
for (i=0; i < blocklen; ++i) s1 += data[j+i], s2 += s1;
|
||||
s1 %= 65521, s2 %= 65521;
|
||||
j += blocklen;
|
||||
blocklen = 5552;
|
||||
}
|
||||
stbi__sbpush(out, (unsigned char) (s2 >> 8));
|
||||
stbi__sbpush(out, (unsigned char) s2);
|
||||
stbi__sbpush(out, (unsigned char) (s1 >> 8));
|
||||
stbi__sbpush(out, (unsigned char) s1);
|
||||
}
|
||||
*out_len = stbi__sbn(out);
|
||||
// make returned pointer freeable
|
||||
memmove(stbi__sbraw(out), out, *out_len);
|
||||
return (unsigned char *) stbi__sbraw(out);
|
||||
}
|
||||
|
||||
unsigned int stbi__crc32(unsigned char *buffer, int len)
|
||||
{
|
||||
static unsigned int crc_table[256];
|
||||
unsigned int crc = ~0u;
|
||||
int i,j;
|
||||
if (crc_table[1] == 0)
|
||||
for(i=0; i < 256; i++)
|
||||
for (crc_table[i]=i, j=0; j < 8; ++j)
|
||||
crc_table[i] = (crc_table[i] >> 1) ^ (crc_table[i] & 1 ? 0xedb88320 : 0);
|
||||
for (i=0; i < len; ++i)
|
||||
crc = (crc >> 8) ^ crc_table[buffer[i] ^ (crc & 0xff)];
|
||||
return ~crc;
|
||||
}
|
||||
|
||||
#define stbi__wpng4(o,a,b,c,d) ((o)[0]=(unsigned char)(a),(o)[1]=(unsigned char)(b),(o)[2]=(unsigned char)(c),(o)[3]=(unsigned char)(d),(o)+=4)
|
||||
#define stbi__wp32(data,v) stbi__wpng4(data, (v)>>24,(v)>>16,(v)>>8,(v));
|
||||
#define stbi__wptag(data,s) stbi__wpng4(data, s[0],s[1],s[2],s[3])
|
||||
|
||||
static void stbi__wpcrc(unsigned char **data, int len)
|
||||
{
|
||||
unsigned int crc = stbi__crc32(*data - len - 4, len+4);
|
||||
stbi__wp32(*data, crc);
|
||||
}
|
||||
|
||||
static unsigned char stbi__paeth(int a, int b, int c)
|
||||
{
|
||||
int p = a + b - c, pa = abs(p-a), pb = abs(p-b), pc = abs(p-c);
|
||||
if (pa <= pb && pa <= pc) return (unsigned char) a;
|
||||
if (pb <= pc) return (unsigned char) b;
|
||||
return (unsigned char) c;
|
||||
}
|
||||
|
||||
unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len)
|
||||
{
|
||||
int ctype[5] = { -1, 0, 4, 2, 6 };
|
||||
unsigned char sig[8] = { 137,80,78,71,13,10,26,10 };
|
||||
unsigned char *out,*o, *filt, *zlib;
|
||||
signed char *line_buffer;
|
||||
int i,j,k,p,zlen;
|
||||
|
||||
if (stride_bytes == 0)
|
||||
stride_bytes = x * n;
|
||||
|
||||
filt = (unsigned char *) malloc((x*n+1) * y); if (!filt) return 0;
|
||||
line_buffer = (signed char *) malloc(x * n); if (!line_buffer) { free(filt); return 0; }
|
||||
for (j=0; j < y; ++j) {
|
||||
static int mapping[] = { 0,1,2,3,4 };
|
||||
static int firstmap[] = { 0,1,0,5,6 };
|
||||
int *mymap = j ? mapping : firstmap;
|
||||
int best = 0, bestval = 0x7fffffff;
|
||||
for (p=0; p < 2; ++p) {
|
||||
for (k= p?best:0; k < 5; ++k) {
|
||||
int type = mymap[k],est=0;
|
||||
unsigned char *z = pixels + stride_bytes*j;
|
||||
for (i=0; i < n; ++i)
|
||||
switch (type) {
|
||||
case 0: line_buffer[i] = z[i]; break;
|
||||
case 1: line_buffer[i] = z[i]; break;
|
||||
case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break;
|
||||
case 3: line_buffer[i] = z[i] - (z[i-stride_bytes]>>1); break;
|
||||
case 4: line_buffer[i] = (signed char) (z[i] - stbi__paeth(0,z[i-stride_bytes],0)); break;
|
||||
case 5: line_buffer[i] = z[i]; break;
|
||||
case 6: line_buffer[i] = z[i]; break;
|
||||
}
|
||||
for (i=n; i < x*n; ++i) {
|
||||
switch (type) {
|
||||
case 0: line_buffer[i] = z[i]; break;
|
||||
case 1: line_buffer[i] = z[i] - z[i-n]; break;
|
||||
case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break;
|
||||
case 3: line_buffer[i] = z[i] - ((z[i-n] + z[i-stride_bytes])>>1); break;
|
||||
case 4: line_buffer[i] = z[i] - stbi__paeth(z[i-n], z[i-stride_bytes], z[i-stride_bytes-n]); break;
|
||||
case 5: line_buffer[i] = z[i] - (z[i-n]>>1); break;
|
||||
case 6: line_buffer[i] = z[i] - stbi__paeth(z[i-n], 0,0); break;
|
||||
}
|
||||
}
|
||||
if (p) break;
|
||||
for (i=0; i < x*n; ++i)
|
||||
est += abs((signed char) line_buffer[i]);
|
||||
if (est < bestval) { bestval = est; best = k; }
|
||||
}
|
||||
}
|
||||
// when we get here, best contains the filter type, and line_buffer contains the data
|
||||
filt[j*(x*n+1)] = (unsigned char) best;
|
||||
memcpy(filt+j*(x*n+1)+1, line_buffer, x*n);
|
||||
}
|
||||
free(line_buffer);
|
||||
zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, 8); // increase 8 to get smaller but use more memory
|
||||
free(filt);
|
||||
if (!zlib) return 0;
|
||||
|
||||
// each tag requires 12 bytes of overhead
|
||||
out = (unsigned char *) malloc(8 + 12+13 + 12+zlen + 12);
|
||||
if (!out) return 0;
|
||||
*out_len = 8 + 12+13 + 12+zlen + 12;
|
||||
|
||||
o=out;
|
||||
memcpy(o,sig,8); o+= 8;
|
||||
stbi__wp32(o, 13); // header length
|
||||
stbi__wptag(o, "IHDR");
|
||||
stbi__wp32(o, x);
|
||||
stbi__wp32(o, y);
|
||||
*o++ = 8;
|
||||
*o++ = (unsigned char) ctype[n];
|
||||
*o++ = 0;
|
||||
*o++ = 0;
|
||||
*o++ = 0;
|
||||
stbi__wpcrc(&o,13);
|
||||
|
||||
stbi__wp32(o, zlen);
|
||||
stbi__wptag(o, "IDAT");
|
||||
memcpy(o, zlib, zlen); o += zlen; free(zlib);
|
||||
stbi__wpcrc(&o, zlen);
|
||||
|
||||
stbi__wp32(o,0);
|
||||
stbi__wptag(o, "IEND");
|
||||
stbi__wpcrc(&o,0);
|
||||
|
||||
assert(o == out + *out_len);
|
||||
|
||||
return out;
|
||||
}
|
||||
|
||||
int stbi_write_png(char const *filename, int x, int y, int comp, const void *data, int stride_bytes)
|
||||
{
|
||||
FILE *f;
|
||||
int len;
|
||||
unsigned char *png = stbi_write_png_to_mem((unsigned char *) data, stride_bytes, x, y, comp, &len);
|
||||
if (!png) return 0;
|
||||
f = fopen(filename, "wb");
|
||||
if (!f) { free(png); return 0; }
|
||||
fwrite(png, 1, len, f);
|
||||
fclose(f);
|
||||
free(png);
|
||||
return 1;
|
||||
}
|
||||
#endif // STB_IMAGE_WRITE_IMPLEMENTATION
|
||||
|
||||
/* Revision history
|
||||
|
||||
0.92 (2010-08-01)
|
||||
casts to unsigned char to fix warnings
|
||||
0.91 (2010-07-17)
|
||||
first public release
|
||||
0.90 first internal release
|
||||
*/
|
||||
Loading…
x
Reference in New Issue
Block a user