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Support loading interlaced PNG files in png decoder (PngFormat::onLoad())

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This commit is contained in:
David Capello 2016-02-16 18:18:29 -03:00
parent fd71ceb4c9
commit 7750982af6
1 changed files with 96 additions and 90 deletions
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44
src/app/file/png_format.cpp
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@ -1,5 +1,5 @@
// Aseprite
// Copyright (C) 2001-2015 David Capello
// Copyright (C) 2001-2016 David Capello
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
@ -69,7 +69,7 @@ bool PngFormat::onLoad(FileOp* fop)
int pass, number_passes;
int num_palette;
png_colorp palette;
png_bytep row_pointer;
png_bytepp rows_pointer;
PixelFormat pixelFormat;
FileHandle handle(open_file_with_exception(fop->filename(), "rb"));
@ -227,15 +227,28 @@ bool PngFormat::onLoad(FileOp* fop)
}
// Allocate the memory to hold the image using the fields of info_ptr.
row_pointer = (png_bytep)png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr));
rows_pointer = (png_bytepp)png_malloc(png_ptr, sizeof(png_bytep) * height);
for (y = 0; y < height; y++)
rows_pointer[y] = (png_bytep)png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr));
for (pass = 0; pass < number_passes; pass++) {
for (y = 0; y < height; y++) {
// Read the line
png_read_row(png_ptr, row_pointer, (png_byte*)NULL);
png_read_rows(png_ptr, rows_pointer+y, nullptr, 1);
fop->setProgress(
(double)((double)pass + (double)(y+1) / (double)(height))
/ (double)number_passes);
if (fop->isStop())
break;
}
}
// Convert rows_pointer into the doc::Image
for (y = 0; y < height; y++) {
// RGB_ALPHA
if (png_get_color_type(png_ptr, info_ptr) == PNG_COLOR_TYPE_RGB_ALPHA) {
uint8_t* src_address = row_pointer;
uint8_t* src_address = rows_pointer[y];
uint32_t* dst_address = (uint32_t*)image->getPixelAddress(0, y);
unsigned int x, r, g, b, a;
@ -249,7 +262,7 @@ bool PngFormat::onLoad(FileOp* fop)
}
// RGB
else if (png_get_color_type(png_ptr, info_ptr) == PNG_COLOR_TYPE_RGB) {
uint8_t* src_address = row_pointer;
uint8_t* src_address = rows_pointer[y];
uint32_t* dst_address = (uint32_t*)image->getPixelAddress(0, y);
unsigned int x, r, g, b, a;
@ -275,7 +288,7 @@ bool PngFormat::onLoad(FileOp* fop)
}
// GRAY_ALPHA
else if (png_get_color_type(png_ptr, info_ptr) == PNG_COLOR_TYPE_GRAY_ALPHA) {
uint8_t* src_address = row_pointer;
uint8_t* src_address = rows_pointer[y];
uint16_t* dst_address = (uint16_t*)image->getPixelAddress(0, y);
unsigned int x, k, a;
@ -287,7 +300,7 @@ bool PngFormat::onLoad(FileOp* fop)
}
// GRAY
else if (png_get_color_type(png_ptr, info_ptr) == PNG_COLOR_TYPE_GRAY) {
uint8_t* src_address = row_pointer;
uint8_t* src_address = rows_pointer[y];
uint16_t* dst_address = (uint16_t*)image->getPixelAddress(0, y);
unsigned int x, k, a;
@ -309,23 +322,16 @@ bool PngFormat::onLoad(FileOp* fop)
}
// PALETTE
else if (png_get_color_type(png_ptr, info_ptr) == PNG_COLOR_TYPE_PALETTE) {
uint8_t* src_address = row_pointer;
uint8_t* src_address = rows_pointer[y];
uint8_t* dst_address = (uint8_t*)image->getPixelAddress(0, y);
unsigned int x;
for (x=0; x<width; x++)
*(dst_address++) = *(src_address++);
}
fop->setProgress(
(double)((double)pass + (double)(y+1) / (double)(height))
/ (double)number_passes);
if (fop->isStop())
break;
png_free(png_ptr, rows_pointer[y]);
}
}
png_free(png_ptr, row_pointer);
png_free(png_ptr, rows_pointer);
// Clean up after the read, and free any memory allocated
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);