change how recovery animation is implemented

Instead of one 'base' installing image and a number of overlay images
that are drawn on top of it, we represent the installing animation
with one PNG that contains all the animation frames, interlaced by
row.  The PNG is expected to have a text chunk with the keyword
'Frames' and a value that's the number of frames (as an ascii
string).  This representation provides better compression, removes the
need to subclass ScreenRecoveryUI just to change the position of the
overlay or number of frames, and doesn't require gr_blit() to support
an alpha channel.

We also remove the 'indeterminate' progress bar used when wiping data
and/or cache.  The main animation serves the same purpose (showing
that the device is still alive); the spinning progress bar has been
redundant for a while.

This changes the default recovery animation to include the
antenna-wiggling and gear-turning that's used in the Nexus 5 recovery
animation.

Change-Id: I51930a76035ac09969a25472f4e572b289418729

Conflicts:
	screen_ui.cpp
	screen_ui.h

2 files changed, 180 insertions, 3 deletions

diff --git a/minui/minui.h b/minui/minui.h
index 1b8dd05..5c0defc 100644
--- a/minui/minui.h
+++ b/minui/minui.h
@@ -72,6 +72,7 @@ void ev_dispatch(void);
 
 // Returns 0 if no error, else negative.
 int res_create_surface(const char* name, gr_surface* pSurface);
+int res_create_multi_surface(const char* name, int* frames, gr_surface** pSurface);
 int res_create_localized_surface(const char* name, gr_surface* pSurface);
 void res_free_surface(gr_surface surface);
 
diff --git a/minui/resources.c b/minui/resources.c
index c0a9cca..5ad9b1d 100644
--- a/minui/resources.c
+++ b/minui/resources.c
@@ -181,6 +181,182 @@ exit:
     return result;
 }
 
+int res_create_multi_surface(const char* name, int* frames, gr_surface** pSurface) {
+    char resPath[256];
+    int result = 0;
+    unsigned char header[8];
+    png_structp png_ptr = NULL;
+    png_infop info_ptr = NULL;
+    int i;
+    GGLSurface** surface = NULL;
+
+    *pSurface = NULL;
+    *frames = -1;
+
+    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_uint_32 width, height;
+    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
+            &color_type, NULL, NULL, NULL);
+
+    int channels = png_get_channels(png_ptr, info_ptr);
+
+    if (!(bit_depth == 8 &&
+          ((channels == 3 && color_type == PNG_COLOR_TYPE_RGB) ||
+           (channels == 4 && color_type == PNG_COLOR_TYPE_RGBA) ||
+           (channels == 1 && (color_type == PNG_COLOR_TYPE_PALETTE ||
+                              color_type == PNG_COLOR_TYPE_GRAY))))) {
+        return -7;
+        goto exit;
+    }
+
+    *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;
+    }
+
+    size_t stride = (color_type == PNG_COLOR_TYPE_GRAY ? 1 : 4) * width;
+    size_t pixelSize = stride * height / *frames;
+
+    surface = malloc(*frames * sizeof(GGLSurface*));
+    if (surface == NULL) {
+        result = -8;
+        goto exit;
+    }
+    for (i = 0; i < *frames; ++i) {
+        surface[i] = malloc(sizeof(GGLSurface) + pixelSize);
+        surface[i]->version = sizeof(GGLSurface);
+        surface[i]->width = width;
+        surface[i]->height = height / *frames;
+        surface[i]->stride = width; /* Yes, pixels, not bytes */
+        surface[i]->data = (unsigned char*) (surface[i] + 1);
+
+        if (channels == 3) {
+            surface[i]->format = GGL_PIXEL_FORMAT_RGBX_8888;
+        } else if (color_type == PNG_COLOR_TYPE_PALETTE) {
+            surface[i]->format = GGL_PIXEL_FORMAT_RGBA_8888;
+        } else if (channels == 1) {
+            surface[i]->format = GGL_PIXEL_FORMAT_L_8;
+        } else {
+            surface[i]->format = GGL_PIXEL_FORMAT_RGBA_8888;
+        }
+    }
+
+    int alpha = (channels == 4);
+    if (color_type == PNG_COLOR_TYPE_PALETTE) {
+        png_set_palette_to_rgb(png_ptr);
+    }
+    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
+        png_set_tRNS_to_alpha(png_ptr);
+        alpha = 1;
+    }
+    if (color_type == PNG_COLOR_TYPE_GRAY) {
+        alpha = 1;
+    }
+
+    png_uint_32 y;
+    if (channels == 3 || (channels == 1 && !alpha)) {
+        for (y = 0; y < height; ++y) {
+            int fy = y / *frames;
+            int fr = y % *frames;
+            unsigned char* pRow = surface[fr]->data + fy * stride;
+            png_read_row(png_ptr, pRow, NULL);
+
+            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;
+            }
+        }
+    } else {
+        for (y = 0; y < height; ++y) {
+            int fy = y / *frames;
+            int fr = y % *frames;
+            unsigned char* pRow = surface[fr]->data + fy * stride;
+            png_read_row(png_ptr, pRow, NULL);
+        }
+    }
+
+    *pSurface = (gr_surface*) surface;
+
+exit:
+    png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+
+    if (fp != NULL) {
+        fclose(fp);
+    }
+    if (result < 0) {
+        if (surface) {
+            for (i = 0; i < *frames; ++i) {
+                if (surface[i]) free(surface[i]);
+            }
+            free(surface);
+        }
+    }
+    return result;
+}
+
 static int matches_locale(const char* loc) {
     if (locale == NULL) return 0;
 
@@ -249,7 +425,7 @@ int res_create_localized_surface(const char* name, gr_surface* pSurface) {
     png_read_info(png_ptr, info_ptr);
 
     int color_type, bit_depth;
-    size_t width, height;
+    png_uint_32 width, height;
     png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
             &color_type, NULL, NULL, NULL);
     int channels = png_get_channels(png_ptr, info_ptr);
@@ -261,13 +437,13 @@ int res_create_localized_surface(const char* name, gr_surface* pSurface) {
     }
 
     unsigned char* row = malloc(width);
-    int y;
+    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 = row+5;
+        char* loc = (char*)row+5;
 
         if (y+1+h >= height || matches_locale(loc)) {
             printf("  %20s: %s (%d x %d @ %d)\n", name, loc, w, h, y);