/*
* 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 <pixelflinger/pixelflinger.h>
#include <png.h>
#include "jpeglib.h"
#include "minui.h"
// libpng gives "undefined reference to 'pow'" errors, and I have no
// idea how to convince the build system to link with -lm. We don't
// need this functionality (it's used for gamma adjustment) so provide
// a dummy implementation to satisfy the linker.
double pow(double x, double y) {
return x;
}
#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_surface_png(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;
printf("png trying to open '%s'\n", name);
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->data;
exit:
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
if (result < 0 && surface != NULL) free(surface);
printf("res_create_surface_png returning: %i\n", result);
return result;
}
int res_create_surface_jpg(const char* name, gr_surface* pSurface) {
GGLSurface* surface = NULL;
int result = 0;
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
FILE* fp = fopen(name, "rb");
if (fp == NULL) {
char resPath[256];
snprintf(resPath, sizeof(resPath)-1, "/res/images/%s", name);
resPath[sizeof(resPath)-1] = '\0';
fp = fopen(resPath, "rb");
if (fp == NULL) {
result = -1;
goto exit;
}
}
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
/* Specify data source for decompression */
jpeg_stdio_src(&cinfo, fp);
/* Read file header, set default decompression parameters */
if (jpeg_read_header(&cinfo, TRUE) != JPEG_HEADER_OK)
goto exit;
/* Start decompressor */
(void) jpeg_start_decompress(&cinfo);
size_t width = cinfo.image_width;
size_t height = cinfo.image_height;
size_t stride = 4 * width;
size_t pixelSize = stride * height;
surface = malloc(sizeof(GGLSurface) + pixelSize);
if (surface == NULL) {
result = -8;
goto exit;
}
unsigned char* pData = (unsigned char*) (surface + 1);
surface->version = sizeof(GGLSurface);
surface->width = width;
surface->height = height;
surface->stride = width; /* Yes, pixels, not bytes */
surface->data = pData;
surface->format = GGL_PIXEL_FORMAT_RGBX_8888;
int y;
for (y = 0; y < (int) height; ++y) {
unsigned char* pRow = pData + y * stride;
jpeg_read_scanlines(&cinfo, &pRow, 1);
int x;
for(x = width - 1; x >= 0; x--) {
int sx = x * 3;
int dx = x * 4;
unsigned char r = pRow[sx];
unsigned char g = pRow[sx + 1];
unsigned char b = pRow[sx + 2];
unsigned char a = 0xff;
pRow[dx ] = r; // r
pRow[dx + 1] = g; // g
pRow[dx + 2] = b; // b
pRow[dx + 3] = a;
}
}
*pSurface = (gr_surface) surface;
exit:
if (fp != NULL)
{
if (surface)
{
(void) jpeg_finish_decompress(&cinfo);
if (result < 0)
{
free(surface);
}
}
jpeg_destroy_decompress(&cinfo);
fclose(fp);
}
return result;
}
int res_create_surface(const char* name, gr_surface* pSurface) {
int ret;
if (!name) return -1;
if (strlen(name) > 4 && strcmp(name + strlen(name) - 4, ".jpg") == 0)
return res_create_surface_jpg(name,pSurface);
ret = res_create_surface_png(name,pSurface);
if (ret < 0)
ret = res_create_surface_jpg(name,pSurface);
return ret;
}
void res_free_surface(gr_surface surface) {
GGLSurface* pSurface = (GGLSurface*) surface;
if (pSurface) {
free(pSurface);
}
}
