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Add code to load and save pngs
Using libpng instead of the lowest-common-denominator gdk-pixbuf loader. This will allow us to load >8bit data, and apply gamma and color correction in the future. For now, this still just provides RGBA8 data. As a consequence, we are now linking against libpng.
This commit is contained in:
Matthias Clasen
Benjamin Otte
parent
66031fd00b
commit
f51f7f85eb
442
gdk/loaders/gdkpng.c
Normal file
442
gdk/loaders/gdkpng.c
Normal file
@ -0,0 +1,442 @@
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/* GDK - The GIMP Drawing Kit
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* Copyright (C) 2021 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gdkpngprivate.h"
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#include "gdktexture.h"
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#include "gdktextureprivate.h"
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#include "gdkmemorytextureprivate.h"
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#include "gsk/ngl/fp16private.h"
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#include <png.h>
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#include <stdio.h>
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/* The main difference between the png load/save code here and
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* gdk-pixbuf is that we can support loading 16-bit data in the
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* future, and we can extract gamma and colorspace information
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* to produce linear, color-corrected data.
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*/
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/* {{{ Callbacks */
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/* No sigsetjmp on Windows */
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#ifndef HAVE_SIGSETJMP
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#define sigjmp_buf jmp_buf
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#define sigsetjmp(jb, x) setjmp(jb)
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#define siglongjmp longjmp
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#endif
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typedef struct
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{
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guchar *data;
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gsize size;
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gsize position;
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} png_io;
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static void
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png_read_func (png_structp png,
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png_bytep data,
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png_size_t size)
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{
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png_io *io;
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io = png_get_io_ptr (png);
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if (io->position + size > io->size)
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png_error (png, "Read past EOF");
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memcpy (data, io->data + io->position, size);
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io->position += size;
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}
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static void
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png_write_func (png_structp png,
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png_bytep data,
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png_size_t size)
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{
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png_io *io;
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io = png_get_io_ptr (png);
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if (io->position > io->size ||
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io->size - io->position < size)
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{
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io->size = io->position + size;
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io->data = g_realloc (io->data, io->size);
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}
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memcpy (io->data + io->position, data, size);
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io->position += size;
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}
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static void
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png_flush_func (png_structp png)
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{
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}
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static png_voidp
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png_malloc_callback (png_structp o,
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png_size_t size)
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{
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return g_try_malloc (size);
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}
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static void
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png_free_callback (png_structp o,
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png_voidp x)
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{
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g_free (x);
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}
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static void
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png_simple_error_callback (png_structp png,
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png_const_charp error_msg)
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{
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GError **error = png_get_error_ptr (png);
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if (error && !*error)
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g_set_error (error,
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GDK_TEXTURE_ERROR, GDK_TEXTURE_ERROR_CORRUPT_IMAGE,
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"Error reading png (%s)", error_msg);
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longjmp (png_jmpbuf (png), 1);
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}
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static void
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png_simple_warning_callback (png_structp png,
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png_const_charp error_msg)
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{
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}
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/* }}} */
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/* {{{ Format conversion */
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static void
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unpremultiply (guchar *data,
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int width,
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int height,
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int stride)
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{
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gsize x, y;
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for (y = 0; y < height; y++)
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{
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for (x = 0; x < width; x++)
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{
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guchar *b = &data[x * 4];
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guint32 pixel;
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guchar alpha;
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memcpy (&pixel, b, sizeof (guint32));
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alpha = (pixel & 0xff000000) >> 24;
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if (alpha == 0)
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{
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b[0] = 0;
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b[1] = 0;
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b[2] = 0;
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b[3] = 0;
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}
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else
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{
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b[0] = (((pixel & 0x00ff0000) >> 16) * 255 + alpha / 2) / alpha;
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b[1] = (((pixel & 0x0000ff00) >> 8) * 255 + alpha / 2) / alpha;
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b[2] = (((pixel & 0x000000ff) >> 0) * 255 + alpha / 2) / alpha;
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b[3] = alpha;
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}
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}
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data += stride;
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}
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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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for (i = 0; i < row_info->rowbytes; i += 4)
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{
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uint8_t *base = &data[i];
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uint8_t alpha = base[3];
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uint32_t p;
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if (alpha == 0)
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{
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p = 0;
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}
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else
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{
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uint8_t red = base[0];
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uint8_t green = base[1];
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uint8_t blue = base[2];
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if (alpha != 0xff)
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{
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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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p = ((uint32_t)alpha << 24) | (red << 16) | (green << 8) | (blue << 0);
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}
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memcpy (base, &p, sizeof (uint32_t));
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}
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}
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static void
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convert_bytes_to_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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for (i = 0; i < row_info->rowbytes; i += 4)
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{
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uint8_t *base = &data[i];
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uint8_t red = base[0];
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uint8_t green = base[1];
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uint8_t blue = base[2];
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uint32_t pixel;
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pixel = (0xffu << 24) | (red << 16) | (green << 8) | (blue << 0);
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memcpy (base, &pixel, sizeof (uint32_t));
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}
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}
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/* }}} */
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/* {{{ Public API */
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GdkTexture *
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gdk_load_png (GBytes *bytes,
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GError **error)
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{
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png_io io;
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png_struct *png = NULL;
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png_info *info;
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guint width, height;
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int depth, color_type;
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int interlace, stride;
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GdkMemoryFormat format;
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guchar *buffer = NULL;
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guchar **row_pointers = NULL;
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GBytes *out_bytes;
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GdkTexture *texture;
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io.data = (guchar *)g_bytes_get_data (bytes, &io.size);
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io.position = 0;
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png = png_create_read_struct_2 (PNG_LIBPNG_VER_STRING,
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error,
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png_simple_error_callback,
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png_simple_warning_callback,
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NULL,
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png_malloc_callback,
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png_free_callback);
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if (png == NULL)
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{
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g_set_error (error,
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GDK_TEXTURE_ERROR, GDK_TEXTURE_ERROR_INSUFFICIENT_MEMORY,
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"Failed to parse png image");
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return NULL;
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}
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info = png_create_info_struct (png);
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if (info == NULL)
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{
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png_destroy_read_struct (&png, NULL, NULL);
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g_set_error (error,
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GDK_TEXTURE_ERROR, GDK_TEXTURE_ERROR_INSUFFICIENT_MEMORY,
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"Failed to parse png image");
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return NULL;
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}
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png_set_read_fn (png, &io, png_read_func);
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if (sigsetjmp (png_jmpbuf (png), 1))
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{
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g_free (buffer);
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g_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_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 < 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_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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if ((depth != 8) ||
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!(color_type == PNG_COLOR_TYPE_RGB ||
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color_type == PNG_COLOR_TYPE_RGB_ALPHA))
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{
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png_destroy_read_struct (&png, &info, NULL);
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g_set_error (error,
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GDK_TEXTURE_ERROR, GDK_TEXTURE_ERROR_UNSUPPORTED,
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"Failed to parse png image");
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return NULL;
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}
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switch (color_type)
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{
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case PNG_COLOR_TYPE_RGB_ALPHA:
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format = GDK_MEMORY_DEFAULT;
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png_set_read_user_transform_fn (png, premultiply_data);
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break;
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case PNG_COLOR_TYPE_RGB:
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format = GDK_MEMORY_DEFAULT;
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png_set_read_user_transform_fn (png, convert_bytes_to_data);
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break;
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default:
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g_assert_not_reached ();
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}
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stride = width * gdk_memory_format_bytes_per_pixel (format);
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if (stride % 4)
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stride += 4 - stride % 4;
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buffer = g_try_malloc_n (height, stride);
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row_pointers = g_try_malloc_n (height, sizeof (char *));
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if (!buffer || !row_pointers)
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{
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g_free (buffer);
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g_free (row_pointers);
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png_destroy_read_struct (&png, &info, NULL);
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g_set_error_literal (error,
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GDK_TEXTURE_ERROR, GDK_TEXTURE_ERROR_INSUFFICIENT_MEMORY,
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"Not enough memory to load png");
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return NULL;
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}
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for (int i = 0; i < height; i++)
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row_pointers[i] = &buffer[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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out_bytes = g_bytes_new_take (buffer, height * stride);
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texture = gdk_memory_texture_new (width, height,
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format,
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out_bytes, stride);
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g_bytes_unref (out_bytes);
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g_free (row_pointers);
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png_destroy_read_struct (&png, &info, NULL);
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return texture;
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}
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GBytes *
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gdk_save_png (GdkTexture *texture)
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{
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png_struct *png = NULL;
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png_info *info;
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png_io io = { NULL, 0, 0 };
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guint width, height, stride;
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guchar *data = NULL;
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guchar *row;
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int y;
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width = gdk_texture_get_width (texture);
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height = gdk_texture_get_height (texture);
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stride = width * 4;
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data = g_malloc_n (stride, height);
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gdk_texture_download (texture, data, stride);
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unpremultiply (data, width, height, stride);
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png = png_create_write_struct_2 (PNG_LIBPNG_VER_STRING, NULL,
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png_simple_error_callback,
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png_simple_warning_callback,
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NULL,
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png_malloc_callback,
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png_free_callback);
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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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{
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png_destroy_read_struct (&png, NULL, NULL);
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return NULL;
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}
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if (sigsetjmp (png_jmpbuf (png), 1))
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{
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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_write_fn (png, &io, png_write_func, png_flush_func);
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png_set_IHDR (png, info, width, height, 8,
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PNG_COLOR_TYPE_RGB_ALPHA,
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PNG_INTERLACE_NONE,
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PNG_COMPRESSION_TYPE_BASE,
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PNG_FILTER_TYPE_BASE);
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png_write_info (png, info);
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png_set_packing (png);
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for (y = 0, row = data; y < height; y++, row += stride)
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png_write_rows (png, &row, 1);
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png_write_end (png, info);
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png_destroy_write_struct (&png, &info);
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return g_bytes_new_take (io.data, io.size);
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}
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/* }}} */
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/* vim:set foldmethod=marker expandtab: */
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31
gdk/loaders/gdkpngprivate.h
Normal file
31
gdk/loaders/gdkpngprivate.h
Normal file
@ -0,0 +1,31 @@
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/* GDK - The GIMP Drawing Kit
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* Copyright (C) 2021 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU Lesser General Public
|
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* License as published by the Free Software Foundation; either
|
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* version 2 of the License, or (at your option) any later version.
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*
|
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* This library is distributed in the hope that it will be useful,
|
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
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* Lesser General Public License for more details.
|
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*
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||||
* You should have received a copy of the GNU Lesser General Public
|
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __GDK_PNG_PRIVATE_H__
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#define __GDK_PNG_PRIVATE_H__
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#include "gdktexture.h"
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#include <gio/gio.h>
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#define PNG_SIGNATURE "\x89PNG"
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GdkTexture *gdk_load_png (GBytes *bytes,
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GError **error);
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GBytes *gdk_save_png (GdkTexture *texture);
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#endif
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@ -51,6 +51,7 @@ gdk_public_sources = files([
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'gdktoplevelsize.c',
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'gdktoplevel.c',
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'gdkdragsurface.c',
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'loaders/gdkpng.c',
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])
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gdk_public_headers = files([
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@ -201,6 +202,7 @@ gdk_deps = [
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platform_gio_dep,
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pangocairo_dep,
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vulkan_dep,
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png_dep,
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]
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if profiler_enabled
|
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@ -257,7 +259,7 @@ endif
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libgdk = static_library('gdk',
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sources: [gdk_sources, gdk_backends_gen_headers, gdkconfig],
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dependencies: gdk_deps + [libgtk_css_dep],
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link_with: [libgtk_css, ],
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link_with: [libgtk_css],
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include_directories: [confinc, gdkx11_inc, wlinc],
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c_args: libgdk_c_args + common_cflags,
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link_whole: gdk_backends,
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15
meson.build
15
meson.build
@ -207,6 +207,17 @@ foreach func : check_functions
|
||||
endif
|
||||
endforeach
|
||||
|
||||
# We use links() because sigsetjmp() is often a macro hidden behind other macros
|
||||
cdata.set('HAVE_SIGSETJMP',
|
||||
cc.links('''#define _POSIX_SOURCE
|
||||
#include <setjmp.h>
|
||||
int main (void) {
|
||||
sigjmp_buf env;
|
||||
sigsetjmp (env, 0);
|
||||
return 0;
|
||||
}''', name: 'sigsetjmp'),
|
||||
)
|
||||
|
||||
# Check for __uint128_t (gcc) by checking for 128-bit division
|
||||
uint128_t_src = '''int main() {
|
||||
static __uint128_t v1 = 100;
|
||||
@ -389,6 +400,10 @@ pangocairo_dep = dependency('pangocairo', version: pango_req,
|
||||
pixbuf_dep = dependency('gdk-pixbuf-2.0', version: gdk_pixbuf_req,
|
||||
fallback : ['gdk-pixbuf', 'gdkpixbuf_dep'],
|
||||
default_options: ['png=enabled', 'jpeg=enabled', 'builtin_loaders=png,jpeg', 'man=false'])
|
||||
png_dep = dependency('libpng',
|
||||
fallback: ['libpng', 'libpng_dep'],
|
||||
required: true)
|
||||
|
||||
epoxy_dep = dependency('epoxy', version: epoxy_req,
|
||||
fallback: ['libepoxy', 'libepoxy_dep'])
|
||||
harfbuzz_dep = dependency('harfbuzz', version: '>= 2.1.0', required: false,
|
||||
|
||||
12
subprojects/libpng.wrap
Normal file
12
subprojects/libpng.wrap
Normal file
@ -0,0 +1,12 @@
|
||||
[wrap-file]
|
||||
directory = libpng-1.6.37
|
||||
source_url = https://github.com/glennrp/libpng/archive/v1.6.37.tar.gz
|
||||
source_filename = libpng-1.6.37.tar.gz
|
||||
source_hash = ca74a0dace179a8422187671aee97dd3892b53e168627145271cad5b5ac81307
|
||||
patch_url = https://wrapdb.mesonbuild.com/v2/libpng_1.6.37-3/get_patch
|
||||
patch_filename = libpng-1.6.37-3-wrap.zip
|
||||
patch_hash = 6c9f32fd9150b3a96ab89be52af664e32207e10aa9f5fb9aa015989ee2dd7100
|
||||
|
||||
[provide]
|
||||
libpng = libpng_dep
|
||||
|
||||
Loading…
Reference in New Issue
Block a user