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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
// Disable symbol overrides so that we can use system headers.
#define FORBIDDEN_SYMBOL_ALLOW_ALL
#include "common/scummsys.h"
#include "common/stream.h"
#include "backends/platform/psp/psppixelformat.h"
#include "backends/platform/psp/display_client.h"
#include "backends/platform/psp/png_loader.h"
//#define __PSP_DEBUG_FUNCS__ /* For debugging function calls */
//#define __PSP_DEBUG_PRINT__ /* For debug printouts */
#include "backends/platform/psp/trace.h"
PngLoader::Status PngLoader::allocate() {
DEBUG_ENTER_FUNC();
if (!findImageDimensions()) {
PSP_ERROR("failed to get image dimensions\n");
return BAD_FILE;
}
_buffer->setSize(_width, _height, _sizeBy);
uint32 bitsPerPixel = _bitDepth * _channels;
if (_paletteSize) { // 8 or 4-bit image
if (bitsPerPixel == 4) {
_buffer->setPixelFormat(PSPPixelFormat::Type_Palette_4bit);
_palette->setPixelFormats(PSPPixelFormat::Type_4444, PSPPixelFormat::Type_Palette_4bit);
_paletteSize = 16; // round up
} else if (bitsPerPixel == 8) { // 8-bit image
_buffer->setPixelFormat(PSPPixelFormat::Type_Palette_8bit);
_palette->setPixelFormats(PSPPixelFormat::Type_4444, PSPPixelFormat::Type_Palette_8bit);
_paletteSize = 256; // round up
} else {
PSP_ERROR("too many bits per pixel[%d] for a palette\n", bitsPerPixel);
return BAD_FILE;
}
} else { // 32-bit image
_buffer->setPixelFormat(PSPPixelFormat::Type_8888);
}
if (!_buffer->allocate()) {
PSP_ERROR("failed to allocate buffer\n");
return OUT_OF_MEMORY;
}
if (_buffer->hasPalette() && !_palette->allocate()) {
PSP_ERROR("failed to allocate palette\n");
return OUT_OF_MEMORY;
}
return OK;
}
bool PngLoader::load() {
DEBUG_ENTER_FUNC();
// Try to load the image
_file.seek(0); // Go back to start
if (!loadImageIntoBuffer()) {
PSP_DEBUG_PRINT("failed to load image\n");
return false;
}
PSP_DEBUG_PRINT("succeded in loading image\n");
if (_paletteSize == 16) // 4-bit
_buffer->flipNibbles(); // required because of PNG 4-bit format
return true;
}
void PngLoader::warningFn(png_structp png_ptr, png_const_charp warning_msg) {
// ignore PNG warnings
}
// Read function for png library to be able to read from our SeekableReadStream
//
void PngLoader::libReadFunc(png_structp pngPtr, png_bytep data, png_size_t length) {
Common::SeekableReadStream &file = *(Common::SeekableReadStream *)pngPtr->io_ptr;
file.read(data, length);
}
bool PngLoader::basicImageLoad() {
DEBUG_ENTER_FUNC();
_pngPtr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!_pngPtr)
return false;
png_set_error_fn(_pngPtr, (png_voidp) NULL, (png_error_ptr) NULL, warningFn);
_infoPtr = png_create_info_struct(_pngPtr);
if (!_infoPtr) {
png_destroy_read_struct(&_pngPtr, png_infopp_NULL, png_infopp_NULL);
return false;
}
// Set the png lib to use our read function
png_set_read_fn(_pngPtr, &_file, libReadFunc);
unsigned int sig_read = 0;
png_set_sig_bytes(_pngPtr, sig_read);
png_read_info(_pngPtr, _infoPtr);
int interlaceType;
png_get_IHDR(_pngPtr, _infoPtr, (png_uint_32 *)&_width, (png_uint_32 *)&_height, &_bitDepth,
&_colorType, &interlaceType, int_p_NULL, int_p_NULL);
_channels = png_get_channels(_pngPtr, _infoPtr);
if (_colorType & PNG_COLOR_MASK_PALETTE)
_paletteSize = _infoPtr->num_palette;
return true;
}
/* Get the width and height of a png image */
bool PngLoader::findImageDimensions() {
DEBUG_ENTER_FUNC();
bool status = basicImageLoad();
PSP_DEBUG_PRINT("width[%d], height[%d], paletteSize[%d], bitDepth[%d], channels[%d], rowBytes[%d]\n", _width, _height, _paletteSize, _bitDepth, _channels, _infoPtr->rowbytes);
png_destroy_read_struct(&_pngPtr, &_infoPtr, png_infopp_NULL);
return status;
}
//
// Load a texture from a png image
//
bool PngLoader::loadImageIntoBuffer() {
DEBUG_ENTER_FUNC();
if (!basicImageLoad()) {
png_destroy_read_struct(&_pngPtr, &_infoPtr, png_infopp_NULL);
return false;
}
png_set_strip_16(_pngPtr); // Strip off 16 bit channels in case they occur
if (_paletteSize) {
// Copy the palette
png_colorp srcPal = _infoPtr->palette;
for (int i = 0; i < _infoPtr->num_palette; i++) {
unsigned char alphaVal = (i < _infoPtr->num_trans) ? _infoPtr->trans[i] : 0xFF; // Load alpha if it's there
_palette->setSingleColorRGBA(i, srcPal->red, srcPal->green, srcPal->blue, alphaVal);
srcPal++;
}
} else { // Not a palettized image
if (_colorType == PNG_COLOR_TYPE_GRAY && _bitDepth < 8)
png_set_gray_1_2_4_to_8(_pngPtr); // Round up grayscale images
if (png_get_valid(_pngPtr, _infoPtr, PNG_INFO_tRNS))
png_set_tRNS_to_alpha(_pngPtr); // Convert trans channel to alpha for 32 bits
png_set_add_alpha(_pngPtr, 0xff, PNG_FILLER_AFTER); // Filler for alpha if none exists
}
uint32 rowBytes = png_get_rowbytes(_pngPtr, _infoPtr);
// there seems to be a bug in libpng where it doesn't increase the rowbytes or the
// channel even after we add the alpha channel
if (_channels == 3 && (rowBytes / _width) == 3) {
_channels = 4;
rowBytes = _width * _channels;
}
PSP_DEBUG_PRINT("rowBytes[%d], channels[%d]\n", rowBytes, _channels);
unsigned char *line = (unsigned char*) malloc(rowBytes);
if (!line) {
png_destroy_read_struct(&_pngPtr, png_infopp_NULL, png_infopp_NULL);
PSP_ERROR("Couldn't allocate line\n");
return false;
}
for (size_t y = 0; y < _height; y++) {
png_read_row(_pngPtr, line, png_bytep_NULL);
_buffer->copyFromRect(line, rowBytes, 0, y, _width, 1); // Copy into buffer
}
free(line);
png_read_end(_pngPtr, _infoPtr);
png_destroy_read_struct(&_pngPtr, &_infoPtr, png_infopp_NULL);
return true;
}
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