/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <linux/fb.h>
#include <linux/kd.h>
#include <png.h>
#include "minui.h"
extern char* locale;
#define SURFACE_DATA_ALIGNMENT 8
static gr_surface malloc_surface(size_t data_size) {
unsigned char* temp = malloc(sizeof(GRSurface) + data_size + SURFACE_DATA_ALIGNMENT);
if (temp == NULL) return NULL;
gr_surface surface = (gr_surface) temp;
surface->data = temp + sizeof(GRSurface) +
(SURFACE_DATA_ALIGNMENT - (sizeof(GRSurface) % SURFACE_DATA_ALIGNMENT));
return surface;
}
static int open_png(const char* name, png_structp* png_ptr, png_infop* info_ptr,
png_uint_32* width, png_uint_32* height, png_byte* channels) {
char resPath[256];
unsigned char header[8];
int result = 0;
snprintf(resPath, sizeof(resPath)-1, "/res/images/%s.png", name);
resPath[sizeof(resPath)-1] = '\0';
FILE* fp = fopen(resPath, "rb");
if (fp == NULL) {
result = -1;
goto exit;
}
size_t bytesRead = fread(header, 1, sizeof(header), fp);
if (bytesRead != sizeof(header)) {
result = -2;
goto exit;
}
if (png_sig_cmp(header, 0, sizeof(header))) {
result = -3;
goto exit;
}
*png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!*png_ptr) {
result = -4;
goto exit;
}
*info_ptr = png_create_info_struct(*png_ptr);
if (!*info_ptr) {
result = -5;
goto exit;
}
if (setjmp(png_jmpbuf(*png_ptr))) {
result = -6;
goto exit;
}
png_init_io(*png_ptr, fp);
png_set_sig_bytes(*png_ptr, sizeof(header));
png_read_info(*png_ptr, *info_ptr);
int color_type, bit_depth;
png_get_IHDR(*png_ptr, *info_ptr, width, height, &bit_depth,
&color_type, NULL, NULL, NULL);
*channels = png_get_channels(*png_ptr, *info_ptr);
if (bit_depth == 8 && *channels == 3 && color_type == PNG_COLOR_TYPE_RGB) {
// 8-bit RGB images: great, nothing to do.
} else if (bit_depth <= 8 && *channels == 1 && color_type == PNG_COLOR_TYPE_GRAY) {
// 1-, 2-, 4-, or 8-bit gray images: expand to 8-bit gray.
png_set_expand_gray_1_2_4_to_8(*png_ptr);
} else if (bit_depth <= 8 && *channels == 1 && color_type == PNG_COLOR_TYPE_PALETTE) {
// paletted images: expand to 8-bit RGB. Note that we DON'T
// currently expand the tRNS chunk (if any) to an alpha
// channel, because minui doesn't support alpha channels in
// general.
png_set_palette_to_rgb(*png_ptr);
*channels = 3;
} else {
fprintf(stderr, "minui doesn't support PNG depth %d channels %d color_type %d\n",
bit_depth, *channels, color_type);
result = -7;
goto exit;
}
return result;
exit:
if (result < 0) {
png_destroy_read_struct(png_ptr, info_ptr, NULL);
}
if (fp != NULL) {
fclose(fp);
}
return result;
}
// "display" surfaces are transformed into the framebuffer's required
// pixel format (currently only RGBX is supported) at load time, so
// gr_blit() can be nothing more than a memcpy() for each row. The
// next two functions are the only ones that know anything about the
// framebuffer pixel format; they need to be modified if the
// framebuffer format changes (but nothing else should).
// Allocate and return a gr_surface sufficient for storing an image of
// the indicated size in the framebuffer pixel format.
static gr_surface init_display_surface(png_uint_32 width, png_uint_32 height) {
gr_surface surface;
surface = malloc_surface(width * height * 4);
if (surface == NULL) return NULL;
surface->width = width;
surface->height = height;
surface->row_bytes = width * 4;
surface->pixel_bytes = 4;
return surface;
}
// Copy 'input_row' to 'output_row', transforming it to the
// framebuffer pixel format. The input format depends on the value of
// 'channels':
//
// 1 - input is 8-bit grayscale
// 3 - input is 24-bit RGB
// 4 - input is 32-bit RGBA/RGBX
//
// 'width' is the number of pixels in the row.
static void transform_rgb_to_draw(unsigned char* input_row,
unsigned char* output_row,
int channels, int width) {
int x;
unsigned char* ip = input_row;
unsigned char* op = output_row;
switch (channels) {
case 1:
// expand gray level to RGBX
for (x = 0; x < width; ++x) {
*op++ = *ip;
*op++ = *ip;
*op++ = *ip;
*op++ = 0xff;
ip++;
}
break;
case 3:
// expand RGBA to RGBX
for (x = 0; x < width; ++x) {
*op++ = *ip++;
*op++ = *ip++;
*op++ = *ip++;
*op++ = 0xff;
}
break;
case 4:
// copy RGBA to RGBX
memcpy(output_row, input_row, width*4);
break;
}
}
int res_create_display_surface(const char* name, gr_surface* pSurface) {
gr_surface surface = NULL;
int result = 0;
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
png_uint_32 width, height;
png_byte channels;
*pSurface = NULL;
result = open_png(name, &png_ptr, &info_ptr, &width, &height, &channels);
if (result < 0) return result;
surface = init_display_surface(width, height);
if (surface == NULL) {
result = -8;
goto exit;
}
unsigned char* p_row = malloc(width * 4);
unsigned int y;
for (y = 0; y < height; ++y) {
png_read_row(png_ptr, p_row, NULL);
transform_rgb_to_draw(p_row, surface->data + y * surface->row_bytes, channels, width);
}
free(p_row);
*pSurface = surface;
exit:
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
if (result < 0 && surface != NULL) free(surface);
return result;
}
int res_create_multi_display_surface(const char* name, int* frames, gr_surface** pSurface) {
gr_surface* surface = NULL;
int result = 0;
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
png_uint_32 width, height;
png_byte channels;
int i;
*pSurface = NULL;
*frames = -1;
result = open_png(name, &png_ptr, &info_ptr, &width, &height, &channels);
if (result < 0) return result;
*frames = 1;
png_textp text;
int num_text;
if (png_get_text(png_ptr, info_ptr, &text, &num_text)) {
for (i = 0; i < num_text; ++i) {
if (text[i].key && strcmp(text[i].key, "Frames") == 0 && text[i].text) {
*frames = atoi(text[i].text);
break;
}
}
printf(" found frames = %d\n", *frames);
}
if (height % *frames != 0) {
printf("bad height (%d) for frame count (%d)\n", height, *frames);
result = -9;
goto exit;
}
surface = malloc(*frames * sizeof(gr_surface));
if (surface == NULL) {
result = -8;
goto exit;
}
for (i = 0; i < *frames; ++i) {
surface[i] = init_display_surface(width, height / *frames);
if (surface[i] == NULL) {
result = -8;
goto exit;
}
}
unsigned char* p_row = malloc(width * 4);
unsigned int y;
for (y = 0; y < height; ++y) {
png_read_row(png_ptr, p_row, NULL);
int frame = y % *frames;
unsigned char* out_row = surface[frame]->data +
(y / *frames) * surface[frame]->row_bytes;
transform_rgb_to_draw(p_row, out_row, channels, width);
}
free(p_row);
*pSurface = (gr_surface*) surface;
exit:
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
if (result < 0) {
if (surface) {
for (i = 0; i < *frames; ++i) {
if (surface[i]) free(surface[i]);
}
free(surface);
}
}
return result;
}
int res_create_alpha_surface(const char* name, gr_surface* pSurface) {
gr_surface surface = NULL;
int result = 0;
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
png_uint_32 width, height;
png_byte channels;
*pSurface = NULL;
result = open_png(name, &png_ptr, &info_ptr, &width, &height, &channels);
if (result < 0) return result;
if (channels != 1) {
result = -7;
goto exit;
}
surface = malloc_surface(width * height);
if (surface == NULL) {
result = -8;
goto exit;
}
surface->width = width;
surface->height = height;
surface->row_bytes = width;
surface->pixel_bytes = 1;
unsigned char* p_row;
unsigned int y;
for (y = 0; y < height; ++y) {
p_row = surface->data + y * surface->row_bytes;
png_read_row(png_ptr, p_row, NULL);
}
*pSurface = surface;
exit:
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
if (result < 0 && surface != NULL) free(surface);
return result;
}
static int matches_locale(const char* loc, const char* locale) {
if (locale == NULL) return 0;
if (strcmp(loc, locale) == 0) return 1;
// if loc does *not* have an underscore, and it matches the start
// of locale, and the next character in locale *is* an underscore,
// that's a match. For instance, loc == "en" matches locale ==
// "en_US".
int i;
for (i = 0; loc[i] != 0 && loc[i] != '_'; ++i);
if (loc[i] == '_') return 0;
return (strncmp(locale, loc, i) == 0 && locale[i] == '_');
}
int res_create_localized_alpha_surface(const char* name,
const char* locale,
gr_surface* pSurface) {
gr_surface surface = NULL;
int result = 0;
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
png_uint_32 width, height;
png_byte channels;
*pSurface = NULL;
if (locale == NULL) {
surface = malloc_surface(0);
surface->width = 0;
surface->height = 0;
surface->row_bytes = 0;
surface->pixel_bytes = 1;
goto exit;
}
result = open_png(name, &png_ptr, &info_ptr, &width, &height, &channels);
if (result < 0) return result;
if (channels != 1) {
result = -7;
goto exit;
}
unsigned char* row = malloc(width);
png_uint_32 y;
for (y = 0; y < height; ++y) {
png_read_row(png_ptr, row, NULL);
int w = (row[1] << 8) | row[0];
int h = (row[3] << 8) | row[2];
int len = row[4];
char* loc = (char*)row+5;
if (y+1+h >= height || matches_locale(loc, locale)) {
printf(" %20s: %s (%d x %d @ %d)\n", name, loc, w, h, y);
surface = malloc_surface(w*h);
if (surface == NULL) {
result = -8;
goto exit;
}
surface->width = w;
surface->height = h;
surface->row_bytes = w;
surface->pixel_bytes = 1;
int i;
for (i = 0; i < h; ++i, ++y) {
png_read_row(png_ptr, row, NULL);
memcpy(surface->data + i*w, row, w);
}
*pSurface = (gr_surface) surface;
break;
} else {
int i;
for (i = 0; i < h; ++i, ++y) {
png_read_row(png_ptr, row, NULL);
}
}
}
exit:
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
if (result < 0 && surface != NULL) free(surface);
return result;
}
void res_free_surface(gr_surface surface) {
free(surface);
}