From 03fd6c56fe57dcd7cc4a7f7166a00ece42491558 Mon Sep 17 00:00:00 2001
From: Vojtech Bocek <vbocek@gmail.com>
Date: Thu, 13 Mar 2014 18:46:34 +0100
Subject: Implement "take a screenshot" feature

* Like in android - press power+volume down, screenshots are saved
  in /sdcard/Pictures/Screenshots (if /sdcard is mounted) or /tmp

Change-Id: Iaefa15b11a1d5fdfac57d77388db1621f378a8d4
Signed-off-by: Vojtech Bocek <vbocek@gmail.com>
---
 minuitwrp/graphics_utils.c | 106 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 minuitwrp/graphics_utils.c

(limited to 'minuitwrp/graphics_utils.c')

diff --git a/minuitwrp/graphics_utils.c b/minuitwrp/graphics_utils.c
new file mode 100644
index 000000000..96f644962
--- /dev/null
+++ b/minuitwrp/graphics_utils.c
@@ -0,0 +1,106 @@
+/*
+ * 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 <stdio.h>
+#include <png.h>
+#include <pixelflinger/pixelflinger.h>
+#include <linux/fb.h>
+
+#include "minui.h"
+
+struct fb_var_screeninfo vi;
+GGLSurface gr_mem_surface;
+
+int gr_save_screenshot(const char *dest)
+{
+    uint32_t y, stride_bytes;
+    int res = -1;
+    GGLContext *gl = NULL;
+    GGLSurface surface;
+    uint8_t * volatile img_data = NULL;
+    uint8_t *ptr;
+    FILE *fp = NULL;
+    png_structp png_ptr = NULL;
+    png_infop info_ptr = NULL;
+
+    fp = fopen(dest, "wb");
+    if(!fp)
+        goto exit;
+
+    img_data = malloc(vi.xres * vi.yres * 3);
+    surface.version = sizeof(surface);
+    surface.width = gr_mem_surface.width;
+    surface.height = gr_mem_surface.height;
+    surface.stride = gr_mem_surface.width;
+    surface.data = img_data;
+    surface.format = GGL_PIXEL_FORMAT_RGB_888;
+
+    gglInit(&gl);
+    gl->colorBuffer(gl, &surface);
+    gl->activeTexture(gl, 0);
+
+    gl->bindTexture(gl, &gr_mem_surface);
+    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, 0, 0);
+    gl->recti(gl, 0, 0, gr_mem_surface.width, gr_mem_surface.height);
+
+    gglUninit(gl);
+    gl = NULL;
+
+    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+    if (!png_ptr)
+        goto exit;
+
+    info_ptr = png_create_info_struct(png_ptr);
+    if (info_ptr == NULL)
+        goto exit;
+
+    if (setjmp(png_jmpbuf(png_ptr)))
+        goto exit;
+
+    png_init_io(png_ptr, fp);
+    png_set_IHDR(png_ptr, info_ptr, surface.width, surface.height,
+         8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
+         PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
+    png_write_info(png_ptr, info_ptr);
+
+    ptr = img_data;
+    stride_bytes = surface.width*3;
+    for(y = 0; y < surface.height; ++y)
+    {
+        png_write_row(png_ptr, ptr);
+        ptr += stride_bytes;
+    }
+
+    png_write_end(png_ptr, NULL);
+
+    res = 0;
+exit:
+    if(info_ptr)
+        png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+    if(png_ptr)
+        png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+    if(gl)
+        gglUninit(gl);
+    if(img_data)
+        free(img_data);
+    if(fp)
+        fclose(fp);
+    return res;
+}
-- 
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