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405 lines
9.2 KiB
405 lines
9.2 KiB
/*
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* Copyright © 2008-2012 Kristian Høgsberg
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* Copyright © 2012 Intel Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include "config.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 <jpeglib.h>
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#include <png.h>
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#include <pixman.h>
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#include "image-loader.h"
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#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
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#ifdef HAVE_WEBP
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#include <webp/decode.h>
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#endif
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static int
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stride_for_width(int width)
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{
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return width * 4;
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}
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static void
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swizzle_row(JSAMPLE *row, JDIMENSION width)
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{
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JSAMPLE *s;
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uint32_t *d;
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s = row + (width - 1) * 3;
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d = (uint32_t *) (row + (width - 1) * 4);
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while (s >= row) {
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*d = 0xff000000 | (s[0] << 16) | (s[1] << 8) | (s[2] << 0);
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s -= 3;
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d--;
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}
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}
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static void
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error_exit(j_common_ptr cinfo)
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{
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longjmp(cinfo->client_data, 1);
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}
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static void
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pixman_image_destroy_func(pixman_image_t *image, void *data)
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{
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free(data);
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}
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static pixman_image_t *
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load_jpeg(FILE *fp)
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{
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struct jpeg_decompress_struct cinfo;
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struct jpeg_error_mgr jerr;
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pixman_image_t *pixman_image = NULL;
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unsigned int i;
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int stride, first;
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JSAMPLE *data, *rows[4];
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jmp_buf env;
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cinfo.err = jpeg_std_error(&jerr);
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jerr.error_exit = error_exit;
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cinfo.client_data = env;
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if (setjmp(env))
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return NULL;
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jpeg_create_decompress(&cinfo);
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jpeg_stdio_src(&cinfo, fp);
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jpeg_read_header(&cinfo, TRUE);
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cinfo.out_color_space = JCS_RGB;
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jpeg_start_decompress(&cinfo);
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stride = cinfo.output_width * 4;
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data = malloc(stride * cinfo.output_height);
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if (data == NULL) {
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fprintf(stderr, "couldn't allocate image data\n");
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return NULL;
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}
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while (cinfo.output_scanline < cinfo.output_height) {
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first = cinfo.output_scanline;
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for (i = 0; i < ARRAY_LENGTH(rows); i++)
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rows[i] = data + (first + i) * stride;
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jpeg_read_scanlines(&cinfo, rows, ARRAY_LENGTH(rows));
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for (i = 0; first + i < cinfo.output_scanline; i++)
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swizzle_row(rows[i], cinfo.output_width);
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}
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jpeg_finish_decompress(&cinfo);
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jpeg_destroy_decompress(&cinfo);
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pixman_image = pixman_image_create_bits(PIXMAN_a8r8g8b8,
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cinfo.output_width,
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cinfo.output_height,
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(uint32_t *) data, stride);
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pixman_image_set_destroy_function(pixman_image,
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pixman_image_destroy_func, data);
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return pixman_image;
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}
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static inline int
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multiply_alpha(int alpha, int color)
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{
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int temp = (alpha * color) + 0x80;
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return ((temp + (temp >> 8)) >> 8);
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}
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static void
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premultiply_data(png_structp png,
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png_row_infop row_info,
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png_bytep data)
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{
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unsigned int i;
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png_bytep p;
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for (i = 0, p = data; i < row_info->rowbytes; i += 4, p += 4) {
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png_byte alpha = p[3];
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uint32_t w;
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if (alpha == 0) {
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w = 0;
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} else {
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png_byte red = p[0];
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png_byte green = p[1];
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png_byte blue = p[2];
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if (alpha != 0xff) {
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red = multiply_alpha(alpha, red);
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green = multiply_alpha(alpha, green);
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blue = multiply_alpha(alpha, blue);
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}
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w = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0);
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}
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* (uint32_t *) p = w;
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}
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}
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static void
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read_func(png_structp png, png_bytep data, png_size_t size)
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{
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FILE *fp = png_get_io_ptr(png);
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if (fread(data, 1, size, fp) != size)
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png_error(png, NULL);
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}
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static void
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png_error_callback(png_structp png, png_const_charp error_msg)
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{
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longjmp (png_jmpbuf (png), 1);
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}
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static pixman_image_t *
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load_png(FILE *fp)
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{
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png_struct *png;
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png_info *info;
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png_byte *data = NULL;
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png_byte **row_pointers = NULL;
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png_uint_32 width, height;
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int depth, color_type, interlace, stride;
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unsigned int i;
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pixman_image_t *pixman_image = NULL;
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png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL,
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png_error_callback, NULL);
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if (!png)
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return NULL;
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info = png_create_info_struct(png);
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if (!info) {
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png_destroy_read_struct(&png, &info, NULL);
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return NULL;
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}
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if (setjmp(png_jmpbuf(png))) {
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if (data)
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free(data);
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if (row_pointers)
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free(row_pointers);
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png_destroy_read_struct(&png, &info, NULL);
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return NULL;
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}
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png_set_read_fn(png, fp, read_func);
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png_read_info(png, info);
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png_get_IHDR(png, info,
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&width, &height, &depth,
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&color_type, &interlace, NULL, NULL);
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if (color_type == PNG_COLOR_TYPE_PALETTE)
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png_set_palette_to_rgb(png);
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if (color_type == PNG_COLOR_TYPE_GRAY)
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png_set_expand_gray_1_2_4_to_8(png);
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if (png_get_valid(png, info, PNG_INFO_tRNS))
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png_set_tRNS_to_alpha(png);
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if (depth == 16)
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png_set_strip_16(png);
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if (depth < 8)
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png_set_packing(png);
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if (color_type == PNG_COLOR_TYPE_GRAY ||
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color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
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png_set_gray_to_rgb(png);
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if (interlace != PNG_INTERLACE_NONE)
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png_set_interlace_handling(png);
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png_set_filler(png, 0xff, PNG_FILLER_AFTER);
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png_set_read_user_transform_fn(png, premultiply_data);
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png_read_update_info(png, info);
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png_get_IHDR(png, info,
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&width, &height, &depth,
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&color_type, &interlace, NULL, NULL);
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stride = stride_for_width(width);
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data = malloc(stride * height);
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if (!data) {
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png_destroy_read_struct(&png, &info, NULL);
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return NULL;
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}
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row_pointers = malloc(height * sizeof row_pointers[0]);
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if (row_pointers == NULL) {
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free(data);
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png_destroy_read_struct(&png, &info, NULL);
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return NULL;
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}
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for (i = 0; i < height; i++)
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row_pointers[i] = &data[i * stride];
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png_read_image(png, row_pointers);
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png_read_end(png, info);
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free(row_pointers);
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png_destroy_read_struct(&png, &info, NULL);
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pixman_image = pixman_image_create_bits(PIXMAN_a8r8g8b8,
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width, height, (uint32_t *) data, stride);
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pixman_image_set_destroy_function(pixman_image,
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pixman_image_destroy_func, data);
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return pixman_image;
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}
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#ifdef HAVE_WEBP
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static pixman_image_t *
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load_webp(FILE *fp)
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{
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WebPDecoderConfig config;
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uint8_t buffer[16 * 1024];
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int len;
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VP8StatusCode status;
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WebPIDecoder *idec;
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if (!WebPInitDecoderConfig(&config)) {
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fprintf(stderr, "Library version mismatch!\n");
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return NULL;
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}
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/* webp decoding api doesn't seem to specify a min size that's
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usable for GetFeatures, but 256 works... */
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len = fread(buffer, 1, 256, fp);
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status = WebPGetFeatures(buffer, len, &config.input);
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if (status != VP8_STATUS_OK) {
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fprintf(stderr, "failed to parse webp header\n");
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WebPFreeDecBuffer(&config.output);
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return NULL;
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}
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config.output.colorspace = MODE_BGRA;
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config.output.u.RGBA.stride = stride_for_width(config.input.width);
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config.output.u.RGBA.size =
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config.output.u.RGBA.stride * config.input.height;
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config.output.u.RGBA.rgba =
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malloc(config.output.u.RGBA.stride * config.input.height);
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config.output.is_external_memory = 1;
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if (!config.output.u.RGBA.rgba) {
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WebPFreeDecBuffer(&config.output);
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return NULL;
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}
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rewind(fp);
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idec = WebPINewDecoder(&config.output);
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if (!idec) {
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WebPFreeDecBuffer(&config.output);
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return NULL;
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}
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while (!feof(fp)) {
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len = fread(buffer, 1, sizeof buffer, fp);
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status = WebPIAppend(idec, buffer, len);
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if (status != VP8_STATUS_OK) {
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fprintf(stderr, "webp decode status %d\n", status);
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WebPIDelete(idec);
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WebPFreeDecBuffer(&config.output);
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return NULL;
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}
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}
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WebPIDelete(idec);
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WebPFreeDecBuffer(&config.output);
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return pixman_image_create_bits(PIXMAN_a8r8g8b8,
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config.input.width,
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config.input.height,
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(uint32_t *) config.output.u.RGBA.rgba,
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config.output.u.RGBA.stride);
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}
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#endif
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struct image_loader {
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unsigned char header[4];
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int header_size;
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pixman_image_t *(*load)(FILE *fp);
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};
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static const struct image_loader loaders[] = {
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{ { 0x89, 'P', 'N', 'G' }, 4, load_png },
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{ { 0xff, 0xd8 }, 2, load_jpeg },
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#ifdef HAVE_WEBP
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{ { 'R', 'I', 'F', 'F' }, 4, load_webp }
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#endif
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};
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pixman_image_t *
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load_image(const char *filename)
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{
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pixman_image_t *image;
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unsigned char header[4];
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FILE *fp;
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unsigned int i;
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fp = fopen(filename, "rb");
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if (fp == NULL)
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return NULL;
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if (fread(header, sizeof header, 1, fp) != 1) {
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fclose(fp);
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return NULL;
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}
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rewind(fp);
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for (i = 0; i < ARRAY_LENGTH(loaders); i++) {
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if (memcmp(header, loaders[i].header,
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loaders[i].header_size) == 0) {
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image = loaders[i].load(fp);
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break;
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}
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}
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fclose(fp);
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if (i == ARRAY_LENGTH(loaders)) {
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fprintf(stderr, "unrecognized file header for %s: "
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"0x%02x 0x%02x 0x%02x 0x%02x\n",
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filename, header[0], header[1], header[2], header[3]);
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image = NULL;
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}
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return image;
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}
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