[Samsung Galaxy Core Plus ROMs, Kernels, Recoveries] santeri3700:
Status 12.9.2015 (DD/MM/YYYY)

Current issue: CM10.1 Cannot boot because of the wrong CWM made for cm_mint. It overwrites init.rc and adds wrong fstab to the system partition.

My own built CWM has graphical bug. Half the screen is black and other half is stretched and pink-ish. Still possible to operate.

graphics.c:

/*
* 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
*
* [url]http://www.apache.org/licenses/LICENSE-2.0[/url]
*
* 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 <stdbool.h>
#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 "minui.h"

#ifdef BOARD_USE_CUSTOM_RECOVERY_FONT
#include BOARD_USE_CUSTOM_RECOVERY_FONT
#else
#include "font_10x18.h"
#endif

#ifdef RECOVERY_BGRA
#define PIXEL_FORMAT GGL_PIXEL_FORMAT_BGRA_8888
#define PIXEL_SIZE 4
#endif
#ifdef RECOVERY_RGBX
#define PIXEL_FORMAT GGL_PIXEL_FORMAT_RGBX_8888
#define PIXEL_SIZE 4
#endif
#ifndef PIXEL_FORMAT
#define PIXEL_FORMAT GGL_PIXEL_FORMAT_RGB_565
#define PIXEL_SIZE 2
#endif

#define NUM_BUFFERS 2

// #define PRINT_SCREENINFO 1 // Enables printing of screen info to log

typedef struct {
GGLSurface texture;
unsigned offset[97];
unsigned cheight;
unsigned ascent;
} GRFont;

static GRFont *gr_font = 0;
static GGLContext *gr_context = 0;
static GGLSurface gr_font_texture;
static GGLSurface gr_framebuffer[NUM_BUFFERS];
static GGLSurface gr_mem_surface;
static unsigned gr_active_fb = 0;
static unsigned double_buffering = 0;

static int gr_fb_fd = -1;
static int gr_vt_fd = -1;

static struct fb_var_screeninfo vi;
static struct fb_fix_screeninfo fi;

#ifdef PRINT_SCREENINFO
static void print_fb_var_screeninfo()
{
LOGI("vi.xres: %d\n", vi.xres);
LOGI("vi.yres: %d\n", vi.yres);
LOGI("vi.xres_virtual: %d\n", vi.xres_virtual);
LOGI("vi.yres_virtual: %d\n", vi.yres_virtual);
LOGI("vi.xoffset: %d\n", vi.xoffset);
LOGI("vi.yoffset: %d\n", vi.yoffset);
LOGI("vi.bits_per_pixel: %d\n", vi.bits_per_pixel);
LOGI("vi.grayscale: %d\n", vi.grayscale);
}
#endif

static int get_framebuffer(GGLSurface *fb)
{
int fd;
void *bits, *vi2;

fd = open("/dev/graphics/fb0", O_RDWR);
if (fd < 0) {
perror("cannot open fb0");
return -1;
}

vi2 = malloc(sizeof(vi) + sizeof(__u32));

if (ioctl(fd, FBIOGET_VSCREENINFO, vi2) < 0) {
perror("failed to get fb0 info");
close(fd);
free(vi2);
return -1;
}
memcpy((void*) &vi, vi2, sizeof(vi));
free(vi2);
fprintf(stderr, "Pixel format: %dx%d @ %dbpp\n", vi.xres, vi.yres, vi.bits_per_pixel);

vi.bits_per_pixel = PIXEL_SIZE * 8;
if (PIXEL_FORMAT == GGL_PIXEL_FORMAT_BGRA_8888) {
fprintf(stderr, "Pixel format: BGRA_8888\n");
if (PIXEL_SIZE != 4) fprintf(stderr, "E: Pixel Size mismatch!\n");
vi.red.offset = 8;
vi.red.length = 8;
vi.green.offset = 16;
vi.green.length = 8;
vi.blue.offset = 24;
vi.blue.length = 8;
vi.transp.offset = 0;
vi.transp.length = 8;
} else if (PIXEL_FORMAT == GGL_PIXEL_FORMAT_RGBX_8888) {
fprintf(stderr, "Pixel format: RGBX_8888\n");
if (PIXEL_SIZE != 4) fprintf(stderr, "E: Pixel Size mismatch!\n");
vi.red.offset = 24;
vi.red.length = 8;
vi.green.offset = 16;
vi.green.length = 8;
vi.blue.offset = 8;
vi.blue.length = 8;
vi.transp.offset = 0;
vi.transp.length = 8;
} else if (PIXEL_FORMAT == GGL_PIXEL_FORMAT_RGB_565) {
#ifdef RECOVERY_RGB_565
fprintf(stderr, "Pixel format: RGB_565\n");
vi.blue.offset = 0;
vi.green.offset = 5;
vi.red.offset = 11;
#else
fprintf(stderr, "Pixel format: BGR_565\n");
vi.blue.offset = 11;
vi.green.offset = 5;
vi.red.offset = 0;
#endif
if (PIXEL_SIZE != 2) fprintf(stderr, "E: Pixel Size mismatch!\n");
vi.blue.length = 5;
vi.green.length = 6;
vi.red.length = 5;
vi.blue.msb_right = 0;
vi.green.msb_right = 0;
vi.red.msb_right = 0;
vi.transp.offset = 0;
vi.transp.length = 0;
}
else
{
perror("unknown pixel format");
close(fd);
return -1;
}

vi.vmode = FB_VMODE_NONINTERLACED;
vi.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;

if (ioctl(fd, FBIOPUT_VSCREENINFO, &vi) < 0) {
perror("failed to put fb0 info");
close(fd);
return -1;
}

if (ioctl(fd, FBIOGET_FSCREENINFO, &fi) < 0) {
perror("failed to get fb0 info");
close(fd);
return -1;
}

bits = mmap(0, fi.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (bits == MAP_FAILED) {
perror("failed to mmap framebuffer");
close(fd);
return -1;
}

#ifdef RECOVERY_GRAPHICS_USE_LINELENGTH
vi.xres_virtual = fi.line_length / PIXEL_SIZE;
#endif

fb->version = sizeof(*fb);
fb->width = vi.xres;
fb->height = vi.yres;
#ifdef BOARD_HAS_JANKY_BACKBUFFER
LOGI("setting JANKY BACKBUFFER\n");
fb->stride = fi.line_length/2;
#else
fb->stride = vi.xres_virtual;
#endif
fb->data = bits;
fb->format = PIXEL_FORMAT;
memset(fb->data, 0, vi.yres * fb->stride * PIXEL_SIZE);

fb++;

/* check if we can use double buffering */
if (vi.yres * fi.line_length * 2 > fi.smem_len)
return fd;

double_buffering = 1;

fb->version = sizeof(*fb);
fb->width = vi.xres;
fb->height = vi.yres;
#ifdef BOARD_HAS_JANKY_BACKBUFFER
fb->stride = fi.line_length/2;
fb->data = (void*) (((unsigned) bits) + vi.yres * fi.line_length);
#else
fb->stride = vi.xres_virtual;
fb->data = (void*) (((unsigned) bits) + vi.yres * fb->stride * PIXEL_SIZE);
#endif
fb->format = PIXEL_FORMAT;
memset(fb->data, 0, vi.yres * fb->stride * PIXEL_SIZE);

#ifdef PRINT_SCREENINFO
print_fb_var_screeninfo();
#endif

return fd;
}

static void get_memory_surface(GGLSurface* ms) {
ms->version = sizeof(*ms);
ms->width = vi.xres;
ms->height = vi.yres;
ms->stride = vi.xres_virtual;
ms->data = malloc(vi.xres_virtual * vi.yres * PIXEL_SIZE);
ms->format = PIXEL_FORMAT;
}

static void set_active_framebuffer(unsigned n)
{
if (n > 1 || !double_buffering) return;
vi.yres_virtual = vi.yres * NUM_BUFFERS;
vi.yoffset = n * vi.yres;
// vi.bits_per_pixel = PIXEL_SIZE * 8;
if (ioctl(gr_fb_fd, FBIOPUT_VSCREENINFO, &vi) < 0) {
perror("active fb swap failed");
}
}

void gr_flip(void)
{
GGLContext *gl = gr_context;

/* swap front and back buffers */
if (double_buffering)
gr_active_fb = (gr_active_fb + 1) & 1;

#ifdef BOARD_HAS_FLIPPED_SCREEN
/* flip buffer 180 degrees for devices with physicaly inverted screens */
unsigned int i;
for (i = 1; i < (vi.xres * vi.yres); i++) {
unsigned short tmp = gr_mem_surface.data[i];
gr_mem_surface.data[i] = gr_mem_surface.data[(vi.xres * vi.yres * 2) - i];
gr_mem_surface.data[(vi.xres * vi.yres * 2) - i] = tmp;
}
#endif

/* copy data from the in-memory surface to the buffer we're about
* to make active. */
memcpy(gr_framebuffer[gr_active_fb].data, gr_mem_surface.data,
vi.xres_virtual * vi.yres * PIXEL_SIZE);

/* inform the display driver */
set_active_framebuffer(gr_active_fb);
}

void gr_color(unsigned char r, unsigned char g, unsigned char b, unsigned char a)
{
GGLContext *gl = gr_context;
GGLint color[4];
color[0] = ((r << 8) | r) + 1;
color[1] = ((g << 8) | g) + 1;
color[2] = ((b << 8) | b) + 1;
color[3] = ((a << 8) | a) + 1;
gl->color4xv(gl, color);
}

int gr_measureEx(const char *s, void* font)
{
GRFont* fnt = (GRFont*) font;
int total = 0;
unsigned pos;
unsigned off;

if (!fnt) fnt = gr_font;

while ((off = *s++))
{
off -= 32;
if (off < 96)
total += (fnt->offset[off+1] - fnt->offset[off]);
}
return total;
}

int gr_measure(const char *s)
{
return gr_measureEx(s, NULL);
}

unsigned character_width(const char *s, void* pFont)
{
GRFont *font = (GRFont*) pFont;
unsigned off;

/* Handle default font */
if (!font) font = gr_font;

off = *s - 32;
if (off == 0)
return 0;

return font->offset[off+1] - font->offset[off];
}

int gr_textEx(int x, int y, const char *s, void* pFont)
{
GGLContext *gl = gr_context;
GRFont *font = (GRFont*) pFont;
unsigned off;
unsigned cwidth;

/* Handle default font */
if (!font) font = gr_font;

gl->bindTexture(gl, &font->texture);
gl->texEnvi(gl, GGL_TEXTURE_ENV, GGL_TEXTURE_ENV_MODE, GGL_REPLACE);
gl->texGeni(gl, GGL_S, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
gl->texGeni(gl, GGL_T, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
gl->enable(gl, GGL_TEXTURE_2D);

while((off = *s++)) {
off -= 32;
cwidth = 0;
if (off < 96) {
cwidth = font->offset[off+1] - font->offset[off];
gl->texCoord2i(gl, (font->offset[off]) - x, 0 - y);
gl->recti(gl, x, y, x + cwidth, y + font->cheight);
x += cwidth;
}
}

return x;
}

int gr_textExW(int x, int y, const char *s, void* pFont, int max_width)
{
GGLContext *gl = gr_context;
GRFont *font = (GRFont*) pFont;
unsigned off;
unsigned cwidth;

/* Handle default font */
if (!font) font = gr_font;

gl->bindTexture(gl, &font->texture);
gl->texEnvi(gl, GGL_TEXTURE_ENV, GGL_TEXTURE_ENV_MODE, GGL_REPLACE);
gl->texGeni(gl, GGL_S, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
gl->texGeni(gl, GGL_T, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
gl->enable(gl, GGL_TEXTURE_2D);

while((off = *s++)) {
off -= 32;
cwidth = 0;
if (off < 96) {
cwidth = font->offset[off+1] - font->offset[off];
if ((x + (int)cwidth) < max_width) {
gl->texCoord2i(gl, (font->offset[off]) - x, 0 - y);
gl->recti(gl, x, y, x + cwidth, y + font->cheight);
x += cwidth;
} else {
gl->texCoord2i(gl, (font->offset[off]) - x, 0 - y);
gl->recti(gl, x, y, max_width, y + font->cheight);
x = max_width;
return x;
}
}
}

return x;
}

int gr_textExWH(int x, int y, const char *s, void* pFont, int max_width, int max_height)
{
GGLContext *gl = gr_context;
GRFont *font = (GRFont*) pFont;
unsigned off;
unsigned cwidth;
int rect_x, rect_y;

/* Handle default font */
if (!font) font = gr_font;

gl->bindTexture(gl, &font->texture);
gl->texEnvi(gl, GGL_TEXTURE_ENV, GGL_TEXTURE_ENV_MODE, GGL_REPLACE);
gl->texGeni(gl, GGL_S, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
gl->texGeni(gl, GGL_T, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
gl->enable(gl, GGL_TEXTURE_2D);

while((off = *s++)) {
off -= 32;
cwidth = 0;
if (off < 96) {
cwidth = font->offset[off+1] - font->offset[off];
if ((x + (int)cwidth) < max_width)
rect_x = x + cwidth;
else
rect_x = max_width;
if (y + font->cheight < (unsigned int)(max_height))
rect_y = y + font->cheight;
else
rect_y = max_height;

gl->texCoord2i(gl, (font->offset[off]) - x, 0 - y);
gl->recti(gl, x, y, rect_x, rect_y);
x += cwidth;
if (x > max_width)
return x;
}
}

return x;
}

int gr_text(int x, int y, const char *s)
{
GGLContext *gl = gr_context;
GRFont *font = gr_font;
unsigned off;
unsigned cwidth = 0;

y -= font->ascent;

gl->bindTexture(gl, &font->texture);
gl->texEnvi(gl, GGL_TEXTURE_ENV, GGL_TEXTURE_ENV_MODE, GGL_REPLACE);
gl->texGeni(gl, GGL_S, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
gl->texGeni(gl, GGL_T, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
gl->enable(gl, GGL_TEXTURE_2D);

while((off = *s++)) {
off -= 32;
if (off < 96) {
cwidth = font->offset[off+1] - font->offset[off];
gl->texCoord2i(gl, (off * cwidth) - x, 0 - y);
gl->recti(gl, x, y, x + cwidth, y + font->cheight);
}
x += cwidth;
}

return x;
}

void gr_fill(int x, int y, int w, int h)
{
GGLContext *gl = gr_context;
gl->disable(gl, GGL_TEXTURE_2D);
gl->recti(gl, x, y, w, h);
}

void gr_blit(gr_surface source, int sx, int sy, int w, int h, int dx, int dy) {
if (gr_context == NULL) {
return;
}

GGLContext *gl = gr_context;
gl->bindTexture(gl, (GGLSurface*) source);
gl->texEnvi(gl, GGL_TEXTURE_ENV, GGL_TEXTURE_ENV_MODE, GGL_REPLACE);
gl->texGeni(gl, GGL_S, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
gl->texGeni(gl, GGL_T, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
gl->enable(gl, GGL_TEXTURE_2D);
gl->texCoord2i(gl, sx - dx, sy - dy);
gl->recti(gl, dx, dy, dx + w, dy + h);
}

unsigned int gr_get_width(gr_surface surface) {
if (surface == NULL) {
return 0;
}
return ((GGLSurface*) surface)->width;
}

unsigned int gr_get_height(gr_surface surface) {
if (surface == NULL) {
return 0;
}
return ((GGLSurface*) surface)->height;
}

void* gr_loadFont(const char* fontName)
{
int fd;
GRFont *font = 0;
GGLSurface *ftex;
unsigned char *bits, *rle;
unsigned char *in, data;
unsigned width, height;
unsigned element;

fd = open(fontName, O_RDONLY);
if (fd == -1)
{
char tmp[128];

sprintf(tmp, "/res/fonts/%s.dat", fontName);
fd = open(tmp, O_RDONLY);
if (fd == -1)
return NULL;
}

font = calloc(sizeof(*font), 1);
ftex = &font->texture;

read(fd, &width, sizeof(unsigned));
read(fd, &height, sizeof(unsigned));
read(fd, font->offset, sizeof(unsigned) * 96);
font->offset[96] = width;

bits = malloc(width * height);
memset(bits, 0, width * height);

unsigned pos = 0;
while (pos < width * height)
{
int bit;

read(fd, &data, 1);
for (bit = 0; bit < 8; bit++)
{
if (data & (1 << (7-bit))) bits[pos++] = 255;
else bits[pos++] = 0;

if (pos == width * height) break;
}
}
close(fd);

ftex->version = sizeof(*ftex);
ftex->width = width;
ftex->height = height;
ftex->stride = width;
ftex->data = (void*) bits;
ftex->format = GGL_PIXEL_FORMAT_A_8;
font->cheight = height;
font->ascent = height - 2;
return (void*) font;
}

int gr_getFontDetails(void* font, unsigned* cheight, unsigned* maxwidth)
{
GRFont *fnt = (GRFont*) font;

if (!fnt) fnt = gr_font;
if (!fnt) return -1;

if (cheight) *cheight = fnt->cheight;
if (maxwidth)
{
int pos;
*maxwidth = 0;
for (pos = 0; pos < 96; pos++)
{
unsigned int width = fnt->offset[pos+1] - fnt->offset[pos];
if (width > *maxwidth)
{
*maxwidth = width;
}
}
}
return 0;
}

void gr_font_size(int *x, int *y)
{
// *x = gr_font->cwidth;
// *y = gr_font->cheight;
gr_getFontDetails(NULL, y, x);
}

static void gr_init_font(void)
{
int fontRes;
GGLSurface *ftex;
unsigned char *bits, *rle;
unsigned char *in, data;
unsigned width, height;
unsigned element;

gr_font = calloc(sizeof(*gr_font), 1);
ftex = &gr_font->texture;

width = font.width;
height = font.height;

bits = malloc(width * height);
rle = bits;

in = font.rundata;
while((data = *in++))
{
memset(rle, (data & 0x80) ? 255 : 0, data & 0x7f);
rle += (data & 0x7f);
}
for (element = 0; element < 97; element++)
{
gr_font->offset[element] = (element * font.cwidth);
}

ftex->version = sizeof(*ftex);
ftex->width = width;
ftex->height = height;
ftex->stride = width;
ftex->data = (void*) bits;
ftex->format = GGL_PIXEL_FORMAT_A_8;
gr_font->cheight = height;
gr_font->ascent = height - 2;
return;
}

int gr_init(void)
{
gglInit(&gr_context);
GGLContext *gl = gr_context;

gr_init_font();
gr_vt_fd = open("/dev/tty0", O_RDWR | O_SYNC);
if (gr_vt_fd < 0) {
// This is non-fatal; post-Cupcake kernels don't have tty0.
} else if (ioctl(gr_vt_fd, KDSETMODE, (void*) KD_GRAPHICS)) {
// However, if we do open tty0, we expect the ioctl to work.
perror("failed KDSETMODE to KD_GRAPHICS on tty0");
gr_exit();
return -1;
}

gr_fb_fd = get_framebuffer(gr_framebuffer);
if (gr_fb_fd < 0) {
perror("Unable to get framebuffer.\n");
gr_exit();
return -1;
}

get_memory_surface(&gr_mem_surface);

fprintf(stderr, "framebuffer: fd %d (%d x %d)\n",
gr_fb_fd, gr_framebuffer[0].width, gr_framebuffer[0].height);

/* start with 0 as front (displayed) and 1 as back (drawing) */
gr_active_fb = 0;
set_active_framebuffer(0);
gl->colorBuffer(gl, &gr_mem_surface);

gl->activeTexture(gl, 0);
gl->enable(gl, GGL_BLEND);
gl->blendFunc(gl, GGL_SRC_ALPHA, GGL_ONE_MINUS_SRC_ALPHA);

// gr_fb_blank(true);
// gr_fb_blank(false);

return 0;
}

void gr_exit(void)
{
close(gr_fb_fd);
gr_fb_fd = -1;

free(gr_mem_surface.data);

ioctl(gr_vt_fd, KDSETMODE, (void*) KD_TEXT);
close(gr_vt_fd);
gr_vt_fd = -1;
}

int gr_fb_width(void)
{
return gr_framebuffer[0].width;
}

int gr_fb_height(void)
{
return gr_framebuffer[0].height;
}

gr_pixel *gr_fb_data(void)
{
return (unsigned short *) gr_mem_surface.data;
}

int gr_fb_blank(int blank)
{
int ret;

ret = ioctl(gr_fb_fd, FBIOBLANK, blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
if (ret < 0)
perror("ioctl(): blank");
return ret;
}

int gr_get_surface(gr_surface* surface)
{
GGLSurface* ms = malloc(sizeof(GGLSurface));
if (!ms) return -1;

// Allocate the data
get_memory_surface(ms);

// Now, copy the data
memcpy(ms->data, gr_mem_surface.data, vi.xres * vi.yres * vi.bits_per_pixel / 8);

*surface = (gr_surface*) ms;
return 0;
}

int gr_free_surface(gr_surface surface)
{
if (!surface)
return -1;

GGLSurface* ms = (GGLSurface*) surface;
free(ms->data);
free(ms);
return 0;
}

void gr_write_frame_to_file(int fd)
{
write(fd, gr_mem_surface.data, vi.xres * vi.yres * vi.bits_per_pixel / 8);
}

Edit: I can see the boot animation.