[PATCH RFC 06/12] Add get_texture_raw_data to extract raw data from a texture

[Frediano Ziglio <fziglio@xxxxxxxxxx>]

Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
 server/egl.c | 29 +++++++++++++++++++++++++++++
 server/egl.h |  3 +++
 2 files changed, 32 insertions(+)

diff --git a/server/egl.c b/server/egl.c
index 9bfa413..b791c95 100644
--- a/server/egl.c
+++ b/server/egl.c
@@ -64,6 +64,35 @@ void *egl_own_context(void *egl_display, void *egl_context)
     return ectx;
 }
 
+static EGLContext egl_context = EGL_NO_CONTEXT;
+
+void *get_texture_raw_data(RedGlTexture *texture, size_t *data_size)
+{
+    if (egl_context == EGL_NO_CONTEXT) {
+        EGLBoolean b;
+        b = eglMakeCurrent(texture->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, texture->egl_context);
+        spice_assert(b != EGL_FALSE);
+    }
+
+    glBindTexture(GL_TEXTURE_2D, texture->tex_id);
+    GLint w = 0, h = 0;
+    glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &w);
+    glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &h);
+    if (w == 0 || h == 0)
+        return NULL;
+    size_t tex_size = w * h * 4;
+    uint8_t *data = spice_malloc(tex_size);
+    glGetTexImage(GL_TEXTURE_2D, 0, GL_BGRA, GL_UNSIGNED_BYTE, data);
+    if (w > texture->width) {
+        int y;
+        for (y = 1; y < texture->height; ++y)
+            memmove(data + texture->width * 4 * y, data + w * 4 * y, texture->width * 4);
+        tex_size = texture->width * texture->height * 4;
+    }
+    *data_size = tex_size;
+    return data;
+}
+
 int egl_get_fd_for_texture(void *egl_display, void *egl_context,
                            uint32_t tex_id,
                            uint32_t *stride, uint32_t *fourcc)
diff --git a/server/egl.h b/server/egl.h
index 6360a8a..cb3f92c 100644
--- a/server/egl.h
+++ b/server/egl.h
@@ -18,6 +18,9 @@
 #ifndef EGL_H_
 #define EGL_H_
 
+#include "red-qxl.h"
+
+void *get_texture_raw_data(RedGlTexture *texture, size_t *data_size);
 int egl_get_fd_for_texture(void *egl_display, void *egl_context,
                            uint32_t tex_id,
                            uint32_t *stride, uint32_t *fourcc);
-- 
2.7.4

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